Document and Entity Information - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Feb. 22, 2018 |
Jun. 30, 2017 |
|
| Document and Entity Information | |||
| Entity Registrant Name | AMERICAN STATES WATER CO | ||
| Entity Central Index Key | 0001056903 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Entity Filer Category | Large Accelerated Filer | ||
| Document Type | 10-K | ||
| Document Period End Date | Dec. 31, 2017 | ||
| Document Fiscal Year Focus | 2017 | ||
| Document Fiscal Period Focus | FY | ||
| Amendment Flag | false | ||
| Entity Common Stock, Shares Outstanding | 36,715,525 | ||
| Entity Well-known Seasoned Issuer | Yes | ||
| Entity Voluntary Filers | No | ||
| Entity Current Reporting Status | Yes | ||
| Entity Public Float | $ 1,963,913 | $ 1,737,328 |
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
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| X | ||||||||||
- Definition If the value is true, then the document is an amendment to previously-filed/accepted document. No definition available.
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| X | ||||||||||
- Definition End date of current fiscal year in the format --MM-DD. No definition available.
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| X | ||||||||||
- Definition This is focus fiscal period of the document report. For a first quarter 2006 quarterly report, which may also provide financial information from prior periods, the first fiscal quarter should be given as the fiscal period focus. Values: FY, Q1, Q2, Q3, Q4, H1, H2, M9, T1, T2, T3, M8, CY. No definition available.
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| X | ||||||||||
- Definition This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006. No definition available.
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| X | ||||||||||
- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. No definition available.
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| X | ||||||||||
- Definition The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word "Other". No definition available.
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| X | ||||||||||
- Definition A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument. No definition available.
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| X | ||||||||||
- Definition Indicate "Yes" or "No" whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure. No definition available.
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| X | ||||||||||
- Definition Indicate whether the registrant is one of the following: (1) Large Accelerated Filer, (2) Accelerated Filer, (3) Non-accelerated Filer, (4) Smaller Reporting Company (Non-accelerated) or (5) Smaller Reporting Accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure. No definition available.
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| X | ||||||||||
- Definition State aggregate market value of voting and non-voting common equity held by non-affiliates computed by reference to price at which the common equity was last sold, or average bid and asked price of such common equity, as of the last business day of registrant's most recently completed second fiscal quarter. The public float should be reported on the cover page of the registrants form 10K. No definition available.
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| X | ||||||||||
- Definition The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Indicate "Yes" or "No" if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. No definition available.
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| X | ||||||||||
- Definition Indicate "Yes" or "No" if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Is used on Form Type: 10-K, 10-Q, 8-K, 20-F, 6-K, 10-K/A, 10-Q/A, 20-F/A, 6-K/A, N-CSR, N-Q, N-1A. No definition available.
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| X | ||||||||||
- Definition This element represents the amount, at the balance sheet date, current portion of receivables that are derived from government contracts. No definition available.
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| X | ||||||||||
- Definition This element represents the cumulative net gain (loss) amount, at the balance sheet date, of market value of open agreements to purchase or sell energy at some future point. No definition available.
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| X | ||||||||||
- Definition This element represents the gross amount, at the balance sheet date, of non utility property assets used in the normal conduct of business and not intended for resale owned by a utility entity. No definition available.
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| X | ||||||||||
- Definition This element represents aggregate amount of capitalized assets classified as property, plant and equipment and other noncurrent investments not otherwise defined in the taxonomy, and also include goodwill, as of the balance sheet date. No definition available.
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| X | ||||||||||
- Definition This element represents capitalized assets classified as property, plant and equipment and other noncurrent investments not otherwise defined in the taxonomy. No definition available.
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| X | ||||||||||
- Definition Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation but before construction work in progress. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. No definition available.
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| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
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| X | ||||||||||
- Definition This element represents aggregate carrying amount, at the balance sheet date, of noncurrent regulatory assets held by public utility entities and other noncurrent assets not separately disclosed in the balance sheet. No definition available.
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| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
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| X | ||||||||||
- Definition This element represents the gross amount, at the balance sheet date, of long-lived electric related physical assets used in the normal conduct of business and not intended for resale owned by a utility entity used in the operations of the entity. No definition available.
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| X | ||||||||||
- Definition This element represents the gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale owned by a utility entity used in the operations of the entity. No definition available.
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| X | ||||||||||
- Definition This element represents the gross amount, at the balance sheet date, of long-lived water related physical assets used in the normal conduct of business and not intended for resale owned by a utility entity used in the operations of the entity. No definition available.
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| X | ||||||||||
- Definition Amount, after allowance, receivable from customers, clients, or other third-parties, and receivables classified as other due within one year or the normal operating cycle, if longer. No definition available.
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| X | ||||||||||
- Definition Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The noncurrent portion of the reserve for accumulated deferred investment tax credits as of the balance sheet date. This is the remaining investment credit, which will reduce the cost of services collected from ratepayers by a ratable portion over the investment's regulatory life. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition This element represents the total consolidated (as applicable) capitalization of the entity which is comprised of its long-term debt and equity instruments. The table may be detailed by subsidiary (legal entity) and include information by type of debt or equity detailed by instrument. No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Developers, builders, governmental agencies and municipalities will provide the entity with cash, or in some cases property, to extend its services to their properties. Nonrefundable contributions are recorded as contributions in aid of construction ("CIAC"). No definition available.
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| X | ||||||||||
- Definition Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings which is expected to be collected after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings which is expected to be collected within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition For utilities only, represents the carrying amount of the liability as of the balance sheet date for payments received by a utility from its customers in advance of performing its obligations under terms of its construction agreements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Aggregated carrying amounts of obligations as of the balance sheet date, excluding long-term debt, incurred as part of the normal operations that are expected to be paid after one year or beyond the normal operating cycle, if longer. Alternate captions include Total Deferred Credits and Other Liabilities. No definition available.
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| X | ||||||||||
- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Current portion of the total carrying amount as of the balance sheet date due within one year or the operating cycle, if longer, on all notes payable to banks paid on an installment with long term maturities. This can include the amount of any loans from the applicant firm. This does not, however, include any mortgage balances. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of noncurrent assets classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Period end book value of accumulated depreciation on property, plant and equipment (PPE) that is owned by the regulated operations of the public utility. No definition available.
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| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. No definition available.
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- Details
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| X | ||||||||||
- Definition This element represents the total consolidated (as applicable) capitalization of the entity which is comprised of its long-term debt and equity instruments. The table may be detailed by subsidiary (legal entity) and include information by type of debt or equity detailed by instrument. No definition available.
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| X | ||||||||||
- Definition Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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| X | ||||||||||
- Definition This element represents the total consolidated (as applicable) capitalization of the entity which is comprised of its long-term debt and equity instruments. The table may be detailed by subsidiary (legal entity) and include information by type of debt or equity detailed by instrument. No definition available.
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| X | ||||||||||
- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Details
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| X | ||||||||||
- Definition This element represents the aggregate expenses on groundwater production assessment. No definition available.
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| X | ||||||||||
- Definition This element represents Power purchased for pumping expenses. No definition available.
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| X | ||||||||||
- Definition This element represents the supply cost balancing accounts maintained for under-collections and over-collections of revenues designed to recover such costs. No definition available.
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| X | ||||||||||
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The aggregate costs related to construction and development services during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of revenue earned from products sold or services provided under the terms of a contract, including, but not limited to, government contracts and construction contracts, classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Cost of electricity purchased as well as fuel used to generate electricity used in operations and sold during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Cost of water purchased, may include any water related assessment. If water is bought on a unit volume basis, would also be considered as commodity costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Revenue derived from the regulated (by a federal, state, or local government or agency) generation, transmission and distribution of electricity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value. No definition available.
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| X | ||||||||||
- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of the cost of borrowed funds accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense. No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The net result for the period of deducting operating expenses from operating revenues. No definition available.
|
| X | ||||||||||
- Definition The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of income (expense) related to nonoperating activities, classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The amount of regulated water operating revenues recognized during the period. No definition available.
|
| X | ||||||||||
- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
CONSOLIDATED STATEMENTS OF CHANGES IN COMMON SHAREHOLDERS' EQUITY - USD ($) $ in Thousands |
Total |
GSWC |
Common Stock [Member] |
Common Stock [Member]
GSWC
|
Earnings Reinvested in the Business |
Earnings Reinvested in the Business
GSWC
|
|---|---|---|---|---|---|---|
| Balances at Dec. 31, 2014 | $ 506,801 | $ 435,190 | $ 253,199 | $ 235,607 | $ 253,602 | $ 199,583 |
| Balances (in shares) at Dec. 31, 2014 | 38,287,000 | 146 | ||||
| Balances (in shares) at Dec. 31, 2015 | 36,502,000 | 146 | ||||
| Add: | ||||||
| Net Income | 60,484 | 47,591 | 60,484 | 47,591 | ||
| Issuance of Common Shares | $ 1,198 | $ 1,198 | ||||
| Issuance of Common Shares (in shares) | 53,612 | 120,000 | ||||
| Exercise of stock options (in shares) | 66,458 | |||||
| Tax benefit from employee stock-based awards | $ 877 | 872 | $ 877 | $ 872 | ||
| Compensation on stock-based awards | 2,168 | 2,077 | 2,168 | 2,077 | ||
| Dividend equivalent rights on stock-based awards not paid in cash | 270 | 239 | $ 270 | 239 | ||
| Stock Repurchased During Period, Shares | 1,905,000 | |||||
| Stock Repurchased During Period, Value | 72,893 | $ 12,690 | 60,203 | |||
| Deduct: | ||||||
| Dividends on Common Shares | 32,690 | 62,000 | 32,690 | 62,000 | ||
| Dividend equivalent rights on stock-based awards | 270 | 239 | 270 | 239 | ||
| Balances at Dec. 31, 2015 | 465,945 | 423,730 | $ 245,022 | $ 238,795 | 220,923 | 184,935 |
| Balances (in shares) at Dec. 31, 2016 | 36,571,000 | 146 | ||||
| Add: | ||||||
| Net Income | $ 59,743 | 46,969 | 59,743 | 46,969 | ||
| Issuance of Common Shares | 501 | $ 501 | ||||
| Issuance of Common Shares (in shares) | 56,900 | |||||
| Exercise of stock options (in shares) | 12,546 | |||||
| Exercise of stock options and other issuance of Common Shares | $ 235 | $ 235 | ||||
| Exercise of stock options and other issuance of Common Shares (in shares) | 69,000 | |||||
| Tax benefit from employee stock-based awards | 581 | $ 581 | ||||
| Compensation on stock-based awards | 1,201 | 1,020 | 1,201 | 1,020 | ||
| Dividend equivalent rights on stock-based awards not paid in cash | 193 | 166 | 193 | 166 | ||
| Deduct: | ||||||
| Dividends on Common Shares | 33,408 | 25,450 | 33,408 | 25,450 | ||
| Dividend equivalent rights on stock-based awards | 193 | 166 | 193 | 166 | ||
| Balances at Dec. 31, 2016 | 494,297 | 446,770 | $ 247,232 | $ 240,482 | 247,065 | 206,288 |
| Balances (in shares) at Dec. 31, 2017 | 36,681,000 | 146 | ||||
| Add: | ||||||
| Net Income | $ 69,367 | 53,757 | 53,757 | |||
| Issuance of Common Shares (in shares) | 56,498 | |||||
| Exercise of stock options (in shares) | 52,936 | |||||
| Exercise of stock options and other issuance of Common Shares | $ 909 | $ 909 | ||||
| Exercise of stock options and other issuance of Common Shares (in shares) | 110,000 | |||||
| Compensation on stock-based awards | 1,789 | 1,527 | $ 1,789 | $ 1,527 | ||
| Dividend equivalent rights on stock-based awards not paid in cash | 194 | 172 | 194 | 172 | ||
| Deduct: | ||||||
| Dividends on Common Shares | 36,417 | 27,680 | 36,417 | 27,680 | ||
| Dividend equivalent rights on stock-based awards | 194 | 172 | 194 | 172 | ||
| Balances at Dec. 31, 2017 | $ 529,945 | $ 474,374 | $ 250,124 | $ 242,181 | $ 279,821 | $ 232,193 |
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition This element represents dividend equivalent rights on stock based awards, net of tax effect. No definition available.
|
| X | ||||||||||
- Definition This element represents equity impact of dividend equivalent rights on stock-based awards which is not paid in cash during the reporting period. No definition available.
|
| X | ||||||||||
- Definition Number of share options (or share units) exercised and new stock issued during the period. No definition available.
|
| X | ||||||||||
- Definition Value of stock issued as a result of the exercise of stock options and new stock issued during the period. No definition available.
|
| X | ||||||||||
- Definition Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Number of new stock issued during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Cash Flows From Operating Activities: | |||
| Net Income | $ 69,367 | $ 59,743 | $ 60,484 |
| Adjustments to reconcile net income to net cash provided by operating activities: | |||
| Depreciation and amortization | 39,273 | 39,109 | 42,674 |
| Provision for doubtful accounts | 989 | 619 | 870 |
| Deferred income taxes and investment tax credits | 12,153 | 27,640 | 10,423 |
| Stock-based compensation expense | 2,885 | 2,538 | 2,754 |
| Gain (Loss) on Sale of Assets and Asset Impairment Charges | (8,318) | 0 | 0 |
| Other - net | (1,525) | (397) | 838 |
| Changes in assets and liabilities: | |||
| Accounts receivable - customers | (7,671) | (1,750) | (923) |
| Unbilled revenue | (2,020) | (4,901) | 1,932 |
| Other accounts receivable | (1,671) | (1,233) | 1,243 |
| Increase (Decrease) Receivable from Government | (4,742) | 2,606 | (848) |
| Materials and supplies | (501) | 1,121 | (1,827) |
| Prepayments and other current assets | (1,641) | 2,239 | 1,580 |
| Increase (Decrease) in Costs in Excess of Billings on Uncompleted Contracts or Programs | 2,881 | 10,433 | 3,223 |
| Increase (Decrease) in Regulatory Assets and Liabilities | 24,626 | (5,610) | (26,422) |
| Accounts payable | 4,358 | (3,442) | 679 |
| Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits | (878) | (289) | 616 |
| Increase (Decrease) in Income Taxes Payable | 13,206 | (6,993) | 9,630 |
| Increase (Decrease) in Billing in Excess of Cost of Earnings | 1,648 | (1,501) | (7,972) |
| Other liabilities | (1,589) | 3,095 | 941 |
| Net Cash Provided | 144,552 | 96,949 | 95,145 |
| Cash Flows From Investing Activities: | |||
| Capital expenditures | (113,126) | (129,867) | (87,323) |
| Proceeds from Sale of Property, Plant, and Equipment | 34,324 | 0 | 54 |
| Net Cash Provided by (Used in) Investing Activities, Continuing Operations | (80,031) | (131,221) | (90,138) |
| Payments to Acquire Investments | (1,229) | (1,354) | (2,869) |
| Proceeds from Issuance of Common Shares and Stock Option Exercises | 909 | 235 | 1,198 |
| Cash Flows From Financing Activities: | |||
| Payments for Repurchase of Common Stock | 0 | 0 | (72,893) |
| Tax benefits from exercise of stock-based awards | 0 | 581 | 877 |
| Receipt of advances for and contributions in aid of construction | 7,275 | 6,660 | 3,731 |
| Refunds on advances for construction | (3,889) | (3,921) | (3,660) |
| Retirement or repayments of long-term debt | (329) | (313) | (237) |
| Net change in notes payable to banks | (31,000) | 62,000 | 28,000 |
| Dividends paid | (36,417) | (33,408) | (32,690) |
| Other | (1,292) | (1,490) | (957) |
| Net Cash Provided by (Used in) Financing Activities, Continuing Operations | (64,743) | 30,344 | (76,631) |
| Net increase (decrease) in cash and cash equivalents | (222) | (3,928) | (71,624) |
| Cash and cash equivalents, beginning of year | 436 | 4,364 | 75,988 |
| Cash and cash equivalents, end of year | 214 | 436 | 4,364 |
| Proceeds from Sale of Property, Plant, and Equipment | 34,324 | 0 | 54 |
| GSWC | |||
| Cash Flows From Operating Activities: | |||
| Net Income | 53,757 | 46,969 | 47,591 |
| Adjustments to reconcile net income to net cash provided by operating activities: | |||
| Depreciation and amortization | 38,094 | 38,063 | 41,534 |
| Provision for doubtful accounts | 816 | 627 | 845 |
| Deferred income taxes and investment tax credits | 13,970 | 28,099 | 10,719 |
| Stock-based compensation expense | 2,420 | 2,118 | 2,443 |
| Gain (Loss) on Sale of Assets and Asset Impairment Charges | (8,318) | 0 | 0 |
| Other - net | (1,613) | (352) | 822 |
| Changes in assets and liabilities: | |||
| Accounts receivable - customers | (7,671) | (1,750) | (923) |
| Unbilled revenue | (1,152) | 481 | (448) |
| Other accounts receivable | (544) | (896) | 1,067 |
| Materials and supplies | (322) | 1,136 | (2,069) |
| Prepayments and other current assets | (1,450) | 2,114 | 440 |
| Increase (Decrease) in Regulatory Assets and Liabilities | 24,626 | (5,610) | (26,422) |
| Accounts payable | 4,927 | (1,514) | 1,940 |
| Increase (Decrease) in Related Party Receivable Payable, Current | (390) | 280 | 445 |
| Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits | (878) | (289) | 616 |
| Increase (Decrease) in Income Taxes Payable | 15,266 | (10,856) | 18,580 |
| Other liabilities | (1,930) | 2,666 | 358 |
| Net Cash Provided | 129,608 | 101,286 | 97,538 |
| Cash Flows From Investing Activities: | |||
| Capital expenditures | (110,487) | (127,913) | (86,144) |
| Origination of Notes Receivable from Related Parties | 0 | 0 | (20,700) |
| Repayment of Notes Receivable from Related Parties | 0 | 0 | 20,700 |
| Payments for (Proceeds from) Other Investing Activities | (1,229) | (1,389) | (2,869) |
| Proceeds from Sale of Property, Plant, and Equipment | 34,324 | 0 | 0 |
| Net Cash Provided by (Used in) Investing Activities, Continuing Operations | (77,392) | (129,302) | (89,013) |
| Cash Flows From Financing Activities: | |||
| Tax benefits from exercise of stock-based awards | 0 | 501 | 872 |
| Receipt of advances for and contributions in aid of construction | 7,275 | 6,660 | 3,731 |
| Refunds on advances for construction | (3,889) | (3,921) | (3,660) |
| Retirement or repayments of long-term debt | (329) | (313) | (237) |
| Net change in inter-company borrowings | (26,500) | 49,500 | 12,000 |
| Dividends paid | (27,680) | (25,450) | (62,000) |
| Other | (1,088) | (1,253) | (735) |
| Net Cash Provided by (Used in) Financing Activities, Continuing Operations | (52,211) | 25,724 | (50,029) |
| Net increase (decrease) in cash and cash equivalents | 5 | (2,292) | (41,504) |
| Cash and cash equivalents, beginning of year | 209 | 2,501 | 44,005 |
| Cash and cash equivalents, end of year | 214 | 209 | 2,501 |
| Proceeds from Sale of Property, Plant, and Equipment | $ 34,324 | $ 0 | $ 0 |
| X | ||||||||||
- Definition The increase (decrease) during the reporting period in the amounts costs and estimated earnings in excess of billings on uncompleted contracts. No definition available.
|
| X | ||||||||||
- Definition The increase (decrease) during the reporting period of related party receivables/payables which are due within one year or one business cycle. No definition available.
|
| X | ||||||||||
- Definition The net change during the reporting period in amount receivable from the government. No definition available.
|
| X | ||||||||||
- Definition The net change during the reporting period in amount of notes payable to banks, excluding mortgage notes, initially due beyond one year or beyond the operating cycle if longer. No definition available.
|
| X | ||||||||||
- Definition This element represents the net change during the reporting period in amount of payments for proceeds from related party debt. No definition available.
|
| X | ||||||||||
- Definition Cash outflow from subsidiaries in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. No definition available.
|
| X | ||||||||||
- Definition The cash inflow from the additional capital contribution to the entity and amount received from holders exercising their stock options. No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition For the entity and the disposal group, cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. No definition available.
|
| X | ||||||||||
- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of deferred income tax expense (benefit) and income tax credits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value. No definition available.
|
| X | ||||||||||
- Definition The increase (decrease) during the reporting period in the amount due from customers for the credit sale of goods and services; includes accounts receivable and other types of receivables. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The increase (decrease) during the reporting period in the liability reflecting cash payments received before the related costs have been incurred. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes, and in deferred and other tax liabilities and assets. No definition available.
|
| X | ||||||||||
- Definition The increase (decrease) during the period in the carrying amount of capitalized costs of materials, supplies, or both, which are not included in inventory. No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of increase (decrease) in operating liabilities classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of increase (decrease) in obligation for pension and other postretirement benefits. Includes, but is not limited to, defined benefit and defined contribution plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of increase (decrease) in prepaid expenses, and assets classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The increase (decrease) during the reporting period in the value of assets that are created when regulatory agencies permits public utilities to defer costs (revenues) to the balance sheet. This element is a the increase (decrease) of regulatory assets and liabilities combined. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The increase (decrease) during the reporting period of the amount of revenue for work performed for which billing has not occurred, net of uncollectible accounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The cash outflow for a loan, supported by a promissory note, granted to related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of income (expense) included in net income that results in no cash inflow (outflow), classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of cash (inflow) outflow from investing activities classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The cash outflow to reacquire common stock during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The cash outflow associated with the purchase of all investments (debt, security, other) during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The cash inflow from developers, builders, governmental agencies and municipalities that provide the entity with cash to extend its construction services to their properties. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of cash inflow (outflow) from financing activities classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The cash inflow from a loan, supported by a promissory note, granted to related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The cash outflow for the payments made by the entity, generally on a straight-line basis over periods ranging from five to forty years to developers, builders, government agencies and municipalities for borrowings received in construction. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Summary of Significant Accounting Policies |
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| Accounting Policies [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Significant Accounting Policies | Summary of Significant Accounting Policies Nature of Operations: American States Water Company (“AWR”) is the parent company of Golden State Water Company (“GSWC”) and American States Utility Services, Inc. (“ASUS”) (and its wholly owned subsidiaries, Fort Bliss Water Services Company (“FBWS”), Terrapin Utility Services, Inc. (“TUS”), Old Dominion Utility Services, Inc. (“ODUS”), Palmetto State Utility Services, Inc. (“PSUS”), Old North Utility Services, Inc. (“ONUS”), Emerald Coast Utility Services, Inc. (“ECUS”), and Fort Riley Utility Services, Inc. ("FRUS")). AWR and its subsidiaries may be collectively referred to as “Registrant” or “the Company.” The subsidiaries of ASUS are collectively referred to as the “Military Utility Privatization Subsidiaries.” GSWC is a public utility engaged principally in the purchase, production, distribution and sale of water in California serving approximately 259,000 customers. GSWC also distributes electricity in several San Bernardino County mountain communities in California serving approximately 24,000 customers through its Bear Valley Electric Service (“BVES”) division. Although Registrant has a diversified base of residential, industrial and other customers, revenues derived from commercial and residential water customers accounted for approximately 90% of total water revenues in 2017, 2016 and 2015. The California Public Utilities Commission (“CPUC”) regulates GSWC’s water and electric businesses in matters including properties, rates, services, facilities, and transactions by GSWC with its affiliates. ASUS, through its Military Utility Privatization Subsidiaries, operates, maintains and performs construction activities (including renewal and replacement capital work) on water and/or wastewater systems at various U.S. military bases pursuant to 50-year firm fixed-price contracts. These contracts are subject to annual economic price adjustments and modifications for changes in circumstances, changes in laws and regulations and additions to the contract value for new construction of facilities at the military bases. In September 2017, ASUS was awarded a new 50-year contract by the U.S. government to operate, maintain, and provide construction management services for the water distribution and wastewater collection and treatment facilities at Fort Riley, a United States Army installation located in Kansas. The contract over the 50-year period is subject to annual economic price adjustments. ASUS expects to assume operations at Fort Riley following the completion of a six-to-twelve-month transition period currently underway. There is no direct regulatory oversight by the CPUC over AWR or the operations, rates or services provided by ASUS or the Military Utility Privatization Subsidiaries. Basis of Presentation: The consolidated financial statements and notes thereto are presented in a combined report filed by two separate Registrants: AWR and GSWC. References in this report to “Registrant” are to AWR and GSWC, collectively, unless otherwise specified. AWR owns all of the outstanding Common Shares of GSWC and ASUS. ASUS owns all of the outstanding Common shares of the Military Utility Privatization Subsidiaries. The consolidated financial statements of AWR include the accounts of AWR and its subsidiaries. These financial statements are prepared in conformity with accounting principles generally accepted in the United States of America. Inter-company transactions and balances have been eliminated in the AWR consolidated financial statements. Related-Party Transactions: GSWC and ASUS provide and/or receive various support services to and from their parent, AWR, and among themselves. GSWC also allocates certain corporate office administrative and general costs to its affiliate, ASUS, using allocation factors approved by the CPUC. During the years ended December 31, 2017, 2016 and 2015, GSWC allocated to ASUS approximately $4.0 million, $3.9 million and $2.6 million, respectively, of corporate office administrative and general costs. In addition, AWR has a $150.0 million syndicated credit facility, which expires in May 2018. Management intends to renew the credit facility prior to its expiration. AWR borrows under this facility and provides funds to its subsidiaries, including GSWC, in support of their operations. The interest rate charged to GSWC and ASUS is sufficient to cover AWR’s interest cost under the credit facility. Amounts owed to GSWC by AWR, including for allocated expenses, are included in GSWC's inter-company receivables as of December 31, 2017 and 2016. In October 2015, AWR issued interest-bearing promissory notes (the "Notes") to GSWC and ASUS for $40 million and $10 million, respectively, which expire in May 2018. Under the terms of the Notes, AWR may borrow from GSWC and ASUS amounts up to $40 million and $10 million, respectively, for working capital purposes. AWR agrees to pay any unpaid principal amounts outstanding under these notes, plus accrued interest. As of December 31, 2017 and 2016, there were no amounts outstanding under these notes. Utility Accounting: Registrant’s accounting policies conform to accounting principles generally accepted in the United States of America ("U.S. GAAP"), including the accounting principles for rate-regulated enterprises, which reflect the ratemaking policies of the CPUC and the Federal Energy Regulatory Commission. GSWC has incurred various costs and received various credits reflected as regulatory assets and liabilities. Accounting for such costs and credits as regulatory assets and liabilities is in accordance with the guidance for accounting for the effects of certain types of regulation. This guidance sets forth the application of U.S. GAAP for those companies whose rates are established by or are subject to approval by an independent third-party regulator. Under such accounting guidance, rate-regulated entities defer costs and credits on the balance sheet as regulatory assets and liabilities when it is probable that those costs and credits will be recognized in the ratemaking process in a period different from the period in which they would have been reflected in income by an unregulated company. These regulatory assets and liabilities are then recognized in the income statement in the period in which the same amounts are reflected in the rates charged for service. The amounts included as regulatory assets and liabilities that will be collected or refunded over a period exceeding one year are classified as long-term assets and liabilities as of December 31, 2017 and 2016. Property and Depreciation: Registrant's property consists primarily of regulated utility plant at GSWC. GSWC capitalizes, as utility plant, the cost of construction and the cost of additions, betterments and replacements of retired units of property. Such cost includes labor, material and certain indirect charges. Water systems acquired are recorded at estimated original cost of utility plant when first devoted to utility service and the applicable depreciation is recorded to accumulated depreciation. The difference between the estimated original cost, less accumulated depreciation, and the purchase price, if recognized by the regulator, is recorded as an acquisition adjustment within utility plant. Depreciation is computed on the straight-line, remaining-life basis, group method, in accordance with the applicable ratemaking process. GSWC's provision for depreciation expressed as a percentage of the aggregate depreciable asset balances was 2.6% for 2017, 2.9% for 2016, and 3.2% for 2015. Depreciation computed on GSWC’s transportation equipment is recorded in other operating expenses and totaled $242,000, $259,000 and $641,000 for the years ended December 31, 2017, 2016 and 2015, respectively. Expenditures for maintenance and repairs are expensed as incurred. Replaced or retired property costs, including cost of removal, are charged to the accumulated provision for depreciation. Estimated useful lives of GSWC’s utility plant, as authorized by the CPUC, are as follows:
Non-regulated property consists primarily of equipment utilized by ASUS and its subsidiaries for its operations. This property is stated at cost, net of accumulated depreciation, which is calculated using the straight-line method over the useful lives of the assets. Asset Retirement Obligations: GSWC has a legal obligation for the retirement of its wells, which by law need to be properly capped at the time of removal. As such, GSWC incurs asset retirement obligations. GSWC records the fair value of a liability for these asset retirement obligations in the period in which they are incurred. When the liability is initially recorded, GSWC capitalizes the cost by increasing the carrying amount of the related long-lived asset. Over time, the liability is accreted to its present value each period, and the capitalized cost is depreciated over the useful life of the related asset. Upon settlement of the liability, GSWC either settles the obligation for its recorded amount or incurs a gain or loss upon settlement. Retirement costs have historically been recovered through rates subsequent to the retirement costs being incurred. Accordingly, recoverability of GSWC’s asset retirement obligations are reflected as a regulatory asset. GSWC also reflects the loss or gain at settlement as a regulatory asset or liability on the balance sheet. With regards to removal costs associated with certain other long-lived assets, such as water mains, distribution and transmission assets, asset retirement obligations have not been recognized as GSWC believes that it will not be obligated to remove these assets. There are no CPUC rules or regulations that require GSWC to remove any of its other long-lived assets. In addition, GSWC’s water pipelines are not subject to regulation by any federal regulatory agency. GSWC has franchise agreements with various municipalities in order to use the public right of way for utility purposes (i.e., operate water distribution and transmission assets), and if certain events occur in the future, GSWC could be required to remove or relocate certain of its pipelines. However, it is not possible to estimate an asset retirement amount since the timing and the amount of assets that may be required to be removed, if any, is not known. Amounts recorded for asset retirement obligations are subject to various assumptions and determinations, such as determining whether a legal obligation exists to remove assets, estimating the fair value of the costs of removal, when final removal will occur and the credit-adjusted risk-free interest rates to be utilized on discounting future liabilities. Changes that may arise over time with regard to these assumptions will change amounts recorded in the future. Revisions in estimates for timing or estimated cash flows are recognized as changes in the carrying amount of the liability and the related capitalized asset. The estimated fair value of the costs of removal was based on third-party costs. Impairment of Long-Lived Assets: Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be fully recoverable in accordance with accounting guidance for impairment or disposal of long-lived assets. Registrant would recognize an impairment loss on its regulated assets only if the carrying value amount of a long-lived asset is not recoverable from customer rates authorized by the CPUC. Impairment loss is measured as the excess of the carrying value over the amounts recovered in customer rates. For the years ended December 31, 2017, 2016 and 2015, no impairment loss was incurred. Goodwill: At December 31, 2017 and 2016, AWR had approximately $1.1 million of goodwill. The $1.1 million goodwill arose from ASUS’s acquisition of a subcontractor’s business at some of the Military Utility Privatization Subsidiaries. In accordance with the accounting guidance for testing goodwill, AWR annually assesses qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. For 2017, AWR’s assessment of qualitative factors did not indicate that an impairment had occurred for goodwill at ASUS. Cash and Cash Equivalents: Cash and cash equivalents include short-term cash investments with an original maturity of three months or less. At times, cash and cash equivalent balances may be in excess of federally insured limits. Cash and cash equivalents are held with financial institutions with high credit standings. Accounts Receivable: Accounts receivable is reported on the balance sheet net of any allowance for doubtful accounts. The allowance for doubtful accounts is Registrant’s best estimate of the amount of probable credit losses in Registrant’s existing accounts receivable from its water and electric customers, and is determined based on historical write-off experience and the aging of account balances. Registrant reviews the allowance for doubtful accounts quarterly. Account balances are written off against the allowance when it is probable the receivable will not be recovered. When utility customers request extended payment terms, credit is extended based on regulatory guidelines, and collateral is not required. Receivables from the U.S. government include amounts due under contracts with the U.S. government to operate and maintain, and/or provide construction services for the water and/or wastewater systems at military bases. Other accounts receivable consist primarily of amounts due from third parties (non-utility customers) for various reasons, including amounts due from contractors, amounts due under settlement agreements, amounts due from other third-party prime government contractors pursuant to agreements for construction of water and/or wastewater facilities for such third-party prime contractors. The allowance for these other accounts receivable is based on Registrant’s evaluation of the receivable portfolio under current conditions and a review of specific problems and such other factors that, in Registrant’s judgment, should be considered in estimating losses. Allowances for doubtful accounts are disclosed in Note 16. Materials and Supplies: Materials and supplies are stated at the lower of cost or net realizable value. Cost is computed using average cost. Major classes of materials include pipe, hydrants and valves. Interest: Interest incurred during the construction of capital assets has generally not been capitalized for financial reporting purposes as such policy is not followed in the ratemaking process. Interest expense is generally recovered through the regulatory process. However, the CPUC has authorized certain capital projects to be filed for revenue recovery with advice letters when those projects are completed. During the time that such projects are under development and construction, GSWC may accrue an allowance for funds used during construction (“AFUDC”) on the incurred expenditures to offset the cost of financing project construction. For the year ended December 31, 2017, no AFUDC was recorded. For the years ended December 31, 2016 and 2015, GSWC recorded $101,000 and $694,000, respectively, of AFUDC related to capital projects based on a weighted cost of capital of 8.34% for water and a cost of debt of 6.96% for electric, as approved by the CPUC. Water and Electric Operating Revenues: GSWC records water and electric utility operating revenues when the service is provided to customers. Revenues include amounts billed to customers on a cycle basis based on meter readings for services provided and unbilled revenues representing estimated amounts to be billed for usage from the last meter reading date to the end of the accounting period. Unbilled revenues are based on historical customer usage to estimate unbilled usage. Alternative-Revenue Programs: As authorized by the CPUC, GSWC records in revenues the difference between the adopted level of volumetric revenues as authorized by the CPUC for metered accounts (volumetric revenues) and the actual volumetric revenues recovered in customer rates. If this difference results in an under-collection of revenues, GSWC records the additional revenue only to the extent that they are expected to be collected within 24 months following the year in which they are recorded in accordance with the accounting guidance for alternative-revenue programs. Contracted Services Revenues: Revenues from ASUS contract operations and maintenance agreements are recognized on a monthly basis when services have been rendered to the U.S. government. Revenues for construction contracts are recognized based on the percentage-of-completion and cost-plus methods of accounting. In accordance with U.S. GAAP, revenue recognition under these methods requires ASUS to estimate the progress toward completion on a contract in terms of efforts such as costs incurred. This approach is used because management considers them to be the best available measure of progress on these contracts. Revenues from cost-plus contracts of ASUS are recognized on the basis of costs incurred during the period plus the profit earned, measured by the cost-to-cost method. Unbilled receivables from the U.S. government represent amounts to be billed for construction work completed and/or for services rendered pursuant to contracts with the U.S government, which are not presently billable but which will be billed under the terms of those contracts. Construction costs for ASUS include all direct material and labor costs charged by subcontractors, direct labor of employees of the Military Utility Privatization Subsidiaries, and those indirect costs related to contract performance, such as indirect labor, supplies, and tools. The factors considered in including such costs in revenues and expenses are that ASUS and/or the Military Utility Privatization Subsidiaries: (i) are the primary obligor in these arrangements with the U.S. government and the third-party prime contractors, (ii) have latitude in establishing pricing, and (iii) bear credit risk in the collection of receivables. Administrative and general costs are charged to expense as incurred. Precontract costs for ASUS, which consist of design and engineering labor costs, are deferred if they are probable of recovery and are expensed as incurred if they are not probable of recovery. Deferred precontract costs have been immaterial to date. Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are determined. Changes in job performance, job conditions, change orders and estimated profitability, including those arising from contract penalty provisions, and final contract settlements may result in revisions to costs and income for ASUS and are recognized in the period in which the revisions are determined. The asset “Costs and estimated earnings in excess of billings on contracts” represents revenues recognized in excess of amounts billed. The liability “Billings in excess of costs and estimated earnings on contracts” represents billings in excess of revenues recognized. Amounts expected to be earned/collected in the next 12-months have been classified as current. Debt Issuance Costs and Redemption Premiums: Original debt issuance costs are deducted from the carrying value of the associated debt liability and amortized over the lives of the respective issues. Premiums paid on the early redemption of debt, which is reacquired through refunding, are deferred and amortized over the life of the debt issued to finance the refunding as Registrant normally receives recovery of these costs in rates. Advances for Construction and Contributions in Aid of Construction: Advances for construction represent amounts advanced by developers for the cost to construct water system facilities in order to extend water service to their properties. Advances are generally refundable in equal annual installments, generally over 40 years. In certain instances, GSWC makes refunds on these advances over a specific period of time based on operating revenues related to the main or as new customers are connected to receive service from the main. Contributions in aid of construction are similar to advances but require no refunding. Generally, GSWC depreciates contributed property and amortizes contributions in aid of construction at the composite rate of the related property. Utility plant funded by advances and contributions is excluded from rate base. Fair Value of Financial Instruments: For cash and cash equivalents, accounts receivable, accounts payable and short-term debt, the carrying amount is assumed to approximate fair value due to the short-term nature of the amounts. The table below estimates the fair value of long-term debt issued by GSWC. Rates available to GSWC at December 31, 2017 and 2016 for debt with similar terms and remaining maturities were used to estimate fair value for long-term debt. Changes in the assumptions will produce differing results.
(1) Excludes debt issuance costs and redemption premiums. The accounting guidance for fair value measurements applies to all financial assets and financial liabilities that are being measured and reported on a fair value basis. Under the accounting guidance, GSWC makes fair value measurements that are classified and disclosed in one of the following three categories: Level 1: Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2: Quoted prices in markets that are not active, or inputs which are observable, either directly or indirectly, for substantially the full term of the asset or liability; or Level 3: Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity). Publicly issued notes, private placement notes and other long-term debt are measured using current U.S. corporate bond yields for similar debt instruments and are classified as Level 2. The following table sets forth by level, within the fair value hierarchy, GSWC’s long-term debt measured at fair value as of December 31, 2017:
Stock-Based Awards: AWR has issued stock-based awards to its employees under stock incentive plans. AWR has also issued stock-based awards to its Board of Directors under non-employee directors stock plans. Registrant applies the provisions in the accounting guidance for share-based payments in accounting for all of its stock-based awards. See Note 12 for further discussion. Sales and Use Taxes: GSWC bills certain sales and use taxes levied by state or local governments to its customers. Included in these sales and use taxes are franchise fees, which GSWC pays to various municipalities (based on ordinances adopted by these municipalities) in order to use public rights of way for utility purposes. GSWC bills these franchise fees to its customers based on a CPUC-authorized rate for each rate-making area as applicable. These franchise fees, which are required to be paid regardless of GSWC’s ability to collect them from its customers, are accounted for on a gross basis. GSWC’s franchise fees billed to customers and recorded as operating revenue were approximately $3.6 million, $3.5 million and $3.8 million for the years ended December 31, 2017, 2016 and 2015, respectively. When GSWC acts as an agent, and the tax is not required to be remitted if it is not collected from the customer, the taxes are accounted for on a net basis. Depending on the state in which its subsidiary operations are conducted, ASUS is also subject to certain state non-income tax assessments generally computed on a “gross receipts” or “gross revenues” basis. These non-income tax assessments are required to be paid regardless of whether the subsidiary is reimbursed by the U.S. government for these assessments under its 50-year contracts, including modifications to these contracts. The non-income tax assessments are accounted for on a gross basis and totaled $287,000, $309,000 and $367,000 during the years ended December 31, 2017, 2016 and 2015, respectively. Recently Issued Accounting Pronouncements: In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update 2016-09, Improvements to Employee Share-Based Payment Accounting, which amends Accounting Standards Codification ("ASC") Topic 718, Compensation - Stock Compensation. Under the new guidance, the tax effects related to share-based payments at settlement (or expiration) are required to be recorded through the income statement rather than through equity, therefore increasing the volatility of income tax expense. The new standard also removed the requirement to delay recognition of a windfall tax benefit until an employer reduces its current taxes payable. It also permits entities to make an accounting policy election for the impact of forfeitures on the recognition of expense for shared-based payment awards. Income tax benefits in excess of compensation costs or tax deficiencies for share-based compensation are recorded to the income tax provision, instead of to shareholders' equity, which can impact the effective tax rate. In addition, the excess tax benefits are classified as an operating activity along with other income tax cash flows on the statement of cash flows. Registrant adopted the new standard effective January 1, 2017 on a prospective basis and, therefore, all excess tax benefits resulting from share-based payments during the year ended December 31, 2017 were reflected in the income statements, which reduced income tax expense by approximately $1,042,000 and $1,011,000 for AWR and GSWC, respectively. In May 2014, the FASB issued Accounting Standard Update 2014-09, Revenue from Contracts with Customers (Topic 606). Under this guidance, an entity recognizes revenue when it transfers promised goods or services to customers in an amount that reflects what the entity expects in exchange for the goods or services. The guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017, and adoption is not permitted earlier than 2017. The guidance allows entities to select one of two methods of adoption, either the full retrospective approach, meaning the guidance would be applied to all periods presented, or modified retrospective approach, meaning the cumulative effect of applying the guidance to prior periods would be recognized as an adjustment to opening retained earnings at January 1, 2018, and requires certain additional disclosures. Registrant intends to use the modified retrospective approach beginning January 1, 2018. Registrant has completed its evaluation and has concluded that the adoption of this guidance will not have a material impact on its measurement or timing of revenue recognition. The guidance will also require enhanced disclosures, including a disaggregated revenue disclosure from contracts with customers. Some revenue arrangements which meet the definition of alternative revenue programs under ASC 980 Regulated Operations, such as GSWC's Water Revenue Adjustment Mechanism and Base Revenue Requirement Adjustment Mechanisms, are excluded from the scope of the new standard and, therefore, will be disclosed separately from the revenues of contracts with customers under the new guidance. In March 2017, the FASB issued Accounting Standards Update 2017-07, Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which changes the financial statement presentation for the costs of defined benefit pension plans and other retirement benefits. Under current U.S. GAAP, the components of net benefit cost for retirement plans (such as service cost, interest cost, expected return on assets, and the amortization of various deferred items), are aggregated as operating costs for financial statement presentation purposes. Under the new guidance, the service cost component will continue to be presented as operating costs, while all other components of net benefit cost will be presented outside of operating income. The new guidance also limits any capitalization of net periodic benefits cost to the service cost component. The new guidance is effective for annual and interim periods beginning after December 15, 2017, with early adoption permitted. Registrant does not expect adoption of this guidance to have a material impact on its consolidated financial statements. Registrant will adopt the new guidance beginning in 2018. In August 2016, the FASB issued Accounting Standards Update 2016-15, Statement of Cash Flows (Topic 230) Classification of Certain Cash Receipts and Cash Payments, which is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. Registrant does not expect the adoption of this new guidance to have a significant impact on its cash flow statements. Registrant will adopt the new guidance beginning in 2018. In February 2016, the FASB issued a new lease accounting standard, Leases (ASC 842). Under the new standard, lessees will recognize a right-of-use asset and a lease liability for virtually all leases (other than leases that meet the definition of a short-term lease). For income statement purposes, leases will be classified as either operating or finance. Operating leases will result in straight-line expense while finance leases will result in a front-loaded expense pattern. The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Registrant will use the practical expedients available under this standard and will not reassess: (i) whether any expired to existing contracts are or contain leases, (ii) the lease classification for any expired or existing leases, and (iii) any initial direct costs for existing leases, if any. Management has not yet determined the effect of the standard on Registrant's financial statements. However, the ultimate impact of adopting this standard will depend on Registrant’s lease portfolio as of the adoption date. |
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- Definition The entire disclosure for the general note to the financial statements for the reporting entity which may include, descriptions of the basis of presentation, business description, significant accounting policies, consolidations, reclassifications, new pronouncements not yet adopted and changes in accounting principles. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Regulatory Matters |
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| Schedule of Regulatory Assets Liabilities [Table Text Block] | Regulatory assets, less regulatory liabilities, included in the consolidated balance sheets are as follows:
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| Regulatory Matters | Regulatory Matters In accordance with accounting principles for rate-regulated enterprises, Registrant records regulatory assets, which represent probable future recovery of costs from customers through the ratemaking process, and regulatory liabilities, which represent probable future refunds that are to be credited to customers through the ratemaking process. At December 31, 2017, Registrant had approximately $59.1 million of regulatory liabilities, net of regulatory assets, not accruing carrying costs. Of this amount, (i) $83.2 million of regulatory liabilities relates to the creation of an excess deferred income tax liability brought about by a lower federal income tax rate as a result of the Tax Cuts and Jobs Act (see Note 10) that is expected to be refunded to customers, (ii) $17.7 million relates to flow-through deferred income taxes including the gross-up portion on the deferred tax resulting from the aforementioned excess deferred income tax regulatory liability (also see Note 10), (iii) $34.7 million of regulatory assets relates to the underfunded position in Registrant's pension and other post-retirement obligations (not including the two-way pension balancing accounts), and (iv) $2.9 million of regulatory assets relates to a memorandum account authorized by the CPUC to track unrealized gains and losses on BVES's purchase power contracts over the term of the contracts. The remainder relates to other items that do not provide for or incur carrying costs. Regulatory assets represent costs incurred by GSWC for which it has received or expects to receive rate recovery in the future. In determining the probability of costs being recognized in other periods, GSWC considers regulatory rules and decisions, past practices, and other facts or circumstances that would indicate if recovery is probable. If the CPUC determines that a portion of GSWC’s assets are not recoverable in customer rates, GSWC must determine if it has suffered an asset impairment that requires it to write down the asset's value. Regulatory assets are offset against regulatory liabilities within each rate-making area. Amounts expected to be collected or refunded in the next twelve months have been classified as current assets and current liabilities by rate-making area. Regulatory assets, less regulatory liabilities, included in the consolidated balance sheets are as follows:
Alternative-Revenue Programs: Under the Water Revenue Adjustment Mechanism (“WRAM”), GSWC records the difference between the adopted level of volumetric revenues as authorized by the CPUC for metered accounts (adopted volumetric revenues) and the actual volumetric revenues recovered in customer rates. While the WRAM tracks volumetric-based revenues, the revenue requirements approved by the CPUC include service charges, flat rate charges, and other items that are not subject to the WRAM. The adopted volumetric revenues consider the seasonality of consumption of water based upon historical averages. The variance between adopted volumetric revenues and actual billed volumetric revenues for metered accounts is recorded as a component of revenue with an offsetting entry to an asset or liability balancing account (tracked individually for each rate making area). The variance amount may be positive or negative and represents amounts that will be billed or refunded to customers in the future. The WRAM only applies to customer classes with conservation rates in place. The majority of GSWC’s water customers have conservation rate structures. Under the Modified Cost Balancing Account (“MCBA”), GSWC tracks adopted expense levels for purchased water, purchased power and pump taxes, as established by the CPUC. Variances (which include the effects of changes in both rate and volume) between adopted and actual purchased water, purchased power, and pump tax expenses are recorded as a component of the MCBA to be recovered from or refunded to GSWC’s customers at a later date. This is reflected with an offsetting entry to an asset or liability balancing account (tracked individually for each rate-making area). Unlike the WRAM, the MCBA applies to all customer classes. The recovery or refund of the WRAM is netted against the MCBA over- or under-collection for the corresponding rate-making area and bears interest at the current 90-day commercial-paper rate. During the year ended December 31, 2017, $33.7 million of pre-2017 WRAM/MCBA balances were recovered. During 2017, GSWC recorded an additional $15.4 million net under-collection in the WRAM/MCBA. The majority of this balance represents an under-collection of supply costs incurred and recorded in the MCBA due to a higher volume of purchased water as compared to adopted. As of December 31, 2017, GSWC had an aggregated regulatory asset of $29.6 million, which is comprised of a $5.6 million under-collection in the WRAM accounts and a $24.0 million under-collection in the MCBA accounts. GSWC is expected to file with the CPUC for recovery of the 2017 WRAM/MCBA balances in March 2018. As required by the accounting guidance for alternative revenue programs, GSWC is required to collect its WRAM balances within 24 months following the year in which an under-collection is recorded. The CPUC has set the recovery period for under-collected WRAM balances that are up to 15% of adopted annual revenues at 18 months or less. For under-collected balances greater than 15%, the recovery period is 19 to 36 months. The recovery periods for the majority of GSWC's WRAM/MCBA balances are primarily within 12 to 24 months; however, there were some ratemaking areas that had recovery periods greater than 24 months. Based on the current CPUC-stipulated recovery periods, as of December 31, 2015, GSWC estimated that approximately $1.4 million of its 2015 WRAM under-collection would not be collected within 24 months as required for revenue recognition under the accounting guidance for alternative revenue programs. As a result, during the fourth quarter of 2015, GSWC did not record $1.4 million of the 2015 WRAM under-collection balance as revenue. This amount was recognized as revenue when it was determined that it would be collected within 24 months. Approximately $910,000 of the 2015 WRAM was recognized in 2016, and the remaining $510,000 was recognized in 2017. Costs Deferred for Future Recovery: The CPUC authorized a memorandum account to allow for the recovery of costs incurred by GSWC related to contamination lawsuits brought against Aerojet-General Corporation ("Aerojet") and the state of California. In July 2005, the CPUC authorized GSWC to recover approximately $21.3 million of the Aerojet litigation memorandum account, through a rate surcharge, which will continue for no longer than 20 years. Beginning in October 2005, a surcharge went into effect to begin amortizing the memorandum account over a 20-year period. Aerojet also agreed to reimburse GSWC $17.5 million, plus interest accruing from January 1, 2004, for GSWC’s past legal and expert costs, which is included in the Aerojet litigation memorandum account. The reimbursement of the $17.5 million is contingent upon the issuance of land use approvals for development in a defined area within Aerojet property in Eastern Sacramento County and the receipt of certain fees in connection with such development. It is management’s intention to offset any proceeds from the housing development by Aerojet in this area against the balance in this litigation memorandum account. At this time, management believes the full balance of the Aerojet litigation memorandum account will be collected either from customers or Aerojet. Pensions and Other Postretirement Obligations: A regulatory asset has been recorded at December 31, 2017 and 2016 for the costs that would otherwise be charged to “other comprehensive income” within shareholders’ equity for the underfunded status of Registrant’s pension and other postretirement benefit plans because the cost of these plans has historically been recovered through rates. As discussed in Note 11, as of December 31, 2017, Registrant’s underfunded position for these plans that have been recorded as a regulatory asset totaled $34.7 million. Registrant expects this regulatory asset to be recovered through rates in future periods. Previous CPUC decisions in the water and electric general rate cases have authorized GSWC to use a two-way balancing account to track differences between the forecasted annual pension expenses adopted in rates and the actual annual expense to be recorded by GSWC in accordance with the accounting guidance for pension costs. The two-way balancing accounts bear interest at the current 90-day commercial paper rate. As of December 31, 2017, GSWC has a net $1.7 million over-collection in the two-way pension balancing accounts, consisting of a $588,000 over-collection related to the general office and water regions, and a $1.1 million over-collection related to BVES. Low Income Balancing Accounts: This regulatory asset reflects primarily the costs of implementing and administering the California Alternate Rates for Water program in GSWC’s water regions and the California Alternate Rate for Energy program in GSWC’s BVES division. These programs mandated by the CPUC provide a discount of a fixed dollar amount which is intended to represent a 15% discount based on a typical customer bill for qualified low-income water customers and 20% for qualified low-income electric customers. GSWC accrues interest on its low income balancing accounts at the prevailing rate for 90-day commercial paper. As of December 31, 2017, there is an aggregate $6.0 million under-collection in the low income balancing accounts. Surcharges have been implemented to recover the costs included in these balancing accounts and are recalibrated in every water general rate case. General Rate Case Memorandum Accounts: The balance in the general rate case memorandum accounts represents the revenue differences between interim rates and final rates authorized by the CPUC due to delays in receiving decisions on various general rate case applications. On December 15, 2016, the CPUC issued a decision on GSWC's water general rate case, which set rates for the years 2016 - 2018. The rates approved by the CPUC were retroactive to January 1, 2016. As a result, as of December 31, 2016, GSWC added $9.5 million to the general rate case memorandum accounts representing the rate difference between interim rates and final rates authorized by the CPUC, retroactive to January 1, 2016. As of December 31, 2017, there is a net aggregate $10.5 million under-collection in these accounts, primarily related to the revenue difference between interim rates and final rates authorized by the CPUC in the December 2016 decision. GSWC has implemented surcharges ranging from 12 -36 months to collect the $10.5 million balance. Other Regulatory Assets: Other regulatory assets represent costs incurred by GSWC for which it has received or expects to receive rate recovery in the future. These regulatory assets are supported by regulatory rules and decisions, past practices, and other facts or circumstances that indicate recovery is probable. Other Regulatory Matters: Renewables Portfolio Standard: BVES is subject to the renewables portfolio standard (“RPS”) law, which requires meeting certain targets of purchases of energy from qualified renewable energy resources. In December 2012, GSWC entered into an agreement with a third party to purchase renewable energy credits (“RECs”) whereby GSWC agreed to purchase approximately 582,000 RECs over a 10 -year period, which would be used towards meeting the CPUC’s RPS procurement requirements. As of December 31, 2017, GSWC has purchased sufficient RECs to be in compliance for all periods through 2017. Accordingly, no provision for loss or potential penalties has been recorded in the financial statements as of December 31, 2017. GSWC intends to file its 2017 compliance report with the CPUC by the August 2018 deadline. The cost of these RECs has been included as part of the electric supply cost balancing account as of December 31, 2017. In October 2015, the governor of California signed a bill into law requiring, among other things, electric utilities to generate half of their electricity from renewable energy sources by 2030. The new requirement is in addition to the existing requirement for electric utilities to generate one third of their electricity from renewable sources by 2020. BVES is assessing various renewable energy opportunities to be in compliance with these requirements. Formal Complaint Filed with the CPUC In June 2016, a third party filed a formal complaint with the CPUC against GSWC about a water main break that occurred in 2014 causing damage to a commercial building. Repairs to the building were delayed for a variety of reasons, including a dispute and litigation between two of GSWC's insurance carriers regarding their respective coverage obligations, as well as questions as to the nature and extent of the building’s damage and the costs associated therewith. The complaint filed with the CPUC requested, among other things, that the CPUC investigate the main break, the damage to the commercial building and the delay of its repairs, and order GSWC to complete repairs immediately. In September 2017, the CPUC dismissed the complaint on the grounds that the CPUC lacks jurisdiction to impose monetary damages for injuries to property, as requested by the third party, and the third party lacks standing with respect to the property as it is not the owner of the damaged property. Previously, the owners of the commercial building filed suit in Ventura County Superior Court against GSWC for damages to the building. In September 2017, the Ventura County Superior Court issued a statement of decision in favor of the plaintiffs, and awarded damages to the plaintiffs in the amount of $2.6 million. Subsequently, the Court also awarded the plaintiffs' attorney fees and other costs. In December 2017, GSWC entered into settlement agreements with its insurance carriers, as well as with the owners of the commercial building, resolving all disputes. The final resolution of this matter resulted in GSWC recording an immaterial charge to expense during the fourth quarter of 2017. |
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- Definition Tabular disclosure of regulatory assets, less regulatory liabilities, included in consolidated balance sheets for continuing operations. No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition The entire disclosure for detailed information about regulatory assets and liabilities, including current and noncurrent assets created when regulatory agencies permit the deferral of costs to the balance sheet that would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues, as well as current and noncurrent liabilities created when regulatory agencies permit. No definition available.
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Utility Plant and Intangible Assets |
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| Utility Plant and Intangible Assets | Utility Plant and Intangible Assets The following table shows Registrant’s utility plant by major asset class:
(1) Includes intangible assets of $1.2 million for the years ended December 31, 2017 and 2016 for studies performed in association with the electricity segment of the Registrant’s operations. As of December 31, 2017 and 2016, intangible assets consist of the following:
(2) Includes intangible assets of $571,000 for contracted services included in "Other Property and Investments" on the consolidated balance sheets as of December 31, 2017 and 2016. (3) The intangible assets not subject to amortization primarily consist of organization and consent fees. For the years ended December 31, 2017, 2016 and 2015, amortization of intangible assets was $1.5 million, $1.9 million and $1.8 million, respectively, for both AWR and GSWC. Estimated future consolidated amortization expenses related to intangible assets for the succeeding five years are (in thousands):
There is no material difference between the consolidated operations of AWR and the operations of GSWC in regard to the future amortization expense of intangible assets. Asset Retirement Obligations: The following is a reconciliation of the beginning and ending aggregate carrying amount of asset retirement obligations, which are included in “Other Credits” on the balance sheets as of December 31, 2017 and 2016:
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| Schedule of Public Utility Property Plant and Equipment Components [Table Text Block] | The following table shows Registrant’s utility plant by major asset class:
(1) Includes intangible assets of $1.2 million for the years ended December 31, 2017 and 2016 for studies performed in association with the electricity segment of the Registrant’s operations. |
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- Definition Tabular disclosure of the components of public utility property, plant and equipment. No definition available.
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- Definition -- None. No documentation exists for this element. -- No definition available.
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- Definition Entire disclosure of property, plant, equipment and intangible assets of the reporting entity. No definition available.
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Derivative Instruments |
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| Derivative Instruments and Hedging Activities Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Derivative Instruments | Derivative Instruments GSWC's electric division, BVES, purchases power under long-term contracts at a fixed cost depending on the amount of power and the period during which the power is purchased under such contracts. In December 2014, the CPUC approved an application that allowed BVES to enter into long-term purchased power contracts with energy providers, which BVES executed in December 2014. BVES began taking power under these long-term contracts effective January 1, 2015 at a fixed cost over three and five year terms depending on the amount of power and period during which the power is purchased under the contracts. The long-term contracts executed in December 2014 are subject to the accounting guidance for derivatives and require mark-to-market derivative accounting. Among other things, the CPUC also authorized BVES to establish a regulatory asset and liability memorandum account to offset the mark-to-market entries required by the accounting guidance. Accordingly, all unrealized gains and losses generated from the purchased power contracts executed in December 2014 are deferred on a monthly basis into a non-interest bearing regulatory memorandum account that tracks the changes in fair value of the derivative throughout the term of the contract. As a result, these unrealized gains and losses do not impact GSWC’s earnings. The three-year contract expired on December 31, 2017. As of December 31, 2017, there was a $2.9 million unrealized loss in the memorandum account, with a corresponding unrealized loss liability for the five-year purchased power contract as a result of the fixed prices being greater than the futures energy prices. The notional volume of derivatives remaining under this long-term contract as of December 31, 2017 was approximately 201,000 megawatt hours. As previously discussed in Note 1, the accounting guidance for fair value measurements establishes a framework for measuring fair value and requires fair value measurements to be classified and disclosed in one of three levels. Registrant’s valuation model utilizes various inputs that include quoted market prices for energy over the duration of the contract. The market prices used to determine the fair value for this derivative instrument were estimated based on independent sources such as broker quotes and publications that are not observable in or corroborated by the market. Registrant received one broker quote to determine the fair value of its derivative instrument. When such inputs have a significant impact on the measurement of fair value, the instrument is categorized as Level 3. Accordingly, the valuation of the derivative on Registrant’s purchased power contract has been classified as Level 3 for all periods presented. The following table presents changes in the fair value of GSWC’s derivatives for the years ended December 31, 2017 and 2016:
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- References No definition available.
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- Definition The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Military Privatization |
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| Military Privatization | Military Privatization Each of the Military Utility Privatization Subsidiaries have entered into a service contract with the U.S. government to operate and maintain, as well as perform construction activities to renew and replace, the water and/or wastewater systems at a military base or bases. The amounts charged for these services are based upon the terms of the 50-year contract between ASUS or the Military Utility Privatization Subsidiaries and the U.S. government. Under the terms of each of these agreements, the Military Utility Privatization Subsidiaries agree to operate and maintain the water and/or wastewater systems for: (i) a monthly net fixed-price for operation and maintenance, and (ii) an amount to cover renewal and replacement capital work. In addition, these contracts may also include firm, fixed-priced initial capital upgrade projects to upgrade the existing infrastructure. Contract modifications are also issued for other necessary capital upgrades to the existing infrastructure approved by the U.S. government. Under the terms of each of these contracts, prices are subject to an economic price adjustment ("EPA") provision, on an annual basis. Prices may also be equitably adjusted for changes in law and other circumstances. ASUS is permitted to file, and has filed, requests for equitable adjustment. Each of the contracts may be subject to termination, in whole or in part, prior to the end of the 50-year term for convenience of the U.S. government or as a result of default or nonperformance by the Military Utility Privatization Subsidiaries. In September 2017, ASUS was awarded a new 50-year contract by the U.S. government to operate, maintain, and provide construction management services for the water distribution and wastewater collection and treatment facilities at Fort Riley, a United States Army installation located in Kansas. ASUS expects to assume operations at Fort Riley following the completion of a 6-to-12-month transition period currently underway. ASUS assumed the operation of the water and wastewater systems at Eglin Air Force Base on June 15, 2017. ASUS has experienced delays in receiving EPAs as provided for under its 50-year contracts. Because of the delays, EPAs, when finally approved, are retroactive. During 2017, the U.S. government approved EPAs at five of the bases served. In some cases, these EPAs included retroactive operation and maintenance management fees for prior periods. In the second quarter of 2017, ASUS recorded approximately $1.0 million in retroactive operation and maintenance management fees and pretax operating income related to periods prior to 2017. In December 2016, ASUS recorded approximately $421,000 in retroactive operation and maintenance management fees and pretax operating income related to periods prior to 2016. Costs and estimated earnings on contracts and amounts due from the U.S. government as of December 31, 2017 and 2016 are as follows:
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- Definition -- None. No documentation exists for this element. -- No definition available.
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| X | ||||||||||
- Definition The entire disclosure for long-term contracts or programs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Earnings Per Share and Capital Stock |
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| Earnings Per Share [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Earnings Per Share and Capital Stock | Earnings Per Share and Capital Stock In accordance with the accounting guidance for participating securities and earnings per share (“EPS”), Registrant uses the “two-class” method of computing EPS. The “two-class” method is an earnings allocation formula that determines EPS for each class of common stock and participating security. AWR has participating securities related to restricted stock units that earn dividend equivalents on an equal basis with AWR’s Common Shares that have been issued under AWR’s 2000, 2008 and 2016 employee plans, and the 2003 and 2013 directors' plans. In applying the “two-class” method, undistributed earnings are allocated to both common shares and participating securities. The following is a reconciliation of Registrant’s net income and weighted average Common Shares outstanding for calculating basic net income per share:
Diluted EPS is based upon the weighted average number of Common Shares, including both outstanding shares and shares potentially issuable in connection with stock options and restricted stock units granted under AWR’s 2000, 2008 and 2016 employee plans, and the 2003 and 2013 directors' plans, and net income. At December 31, 2017, there were 69,202 stock options outstanding under the 2000 and 2008 employee stock option plans. As of January 28, 2018, all stock options remaining outstanding under the 2000 plan were canceled in accordance with the terms of the 2000 plan. At December 31, 2017, there were also 205,166 restricted stock units outstanding including performance shares awarded to officers of the Registrant. The following is a reconciliation of Registrant’s net income and weighted average Common Shares outstanding for calculating diluted net income per share:
(1) In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 69,202 stock options and 205,166 restricted stock units, including performance awards, at December 31, 2017 were deemed to be outstanding in accordance with accounting guidance on earnings per share. During the years ended December 31, 2017, 2016 and 2015, AWR issued Common Shares totaling 56,498, 56,900 and 53,612, respectively, under AWR's employee stock incentive plans and the non-employee directors' plans. In addition, during the years ended December 31, 2017, 2016 and 2015, AWR issued 52,936, 12,546 and 66,458 Common Shares for approximately $909,000, $235,000 and $1,198,000, respectively, as a result of the exercise of stock options. During 2017, 2016 and 2015, no cash proceeds received by AWR as a result of the exercise of stock options were distributed to any of AWR's subsidiaries. AWR has not issued any Common Shares during 2017, 2016 and 2015 under AWR's Common Share Purchase and Dividend Reinvestment Plan ("DRP") and the 401(k) Plan. Shares reserved for the 401(k) Plan are in relation to AWR’s matching contributions and investment by participants. As of December 31, 2017, there were 1,055,948 and 387,300 Common Shares authorized for issuance directly by AWR but unissued under the DRP and the 401(k) Plan, respectively. In 2014 and 2015, AWR's Board of Directors approved two stock repurchase programs, authorizing AWR to repurchase up to 2.45 million shares of its Common Shares. Both programs were completed during 2015. Under these programs, Registrant repurchased 1,905,000 Common Shares on the open market during 2015. GSWC’s outstanding Common Shares are owned entirely by its parent, AWR. To the extent GSWC does not reimburse AWR for stock-based compensation awarded under various stock compensation plans, such amounts increase the value of GSWC’s common shareholder’s equity. |
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- References No definition available.
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- Definition The entire disclosure for earnings per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Dividend Limitations |
12 Months Ended |
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Dec. 31, 2017 | |
| Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract] | |
| Dividend Limitations | Dividend Limitations GSWC is subject to contractual restrictions on its ability to pay dividends. GSWC’s maximum ability to pay dividends is restricted by certain Note Agreements to the sum of $21.0 million plus 100% of consolidated net income from various dates plus the aggregate net cash proceeds received from capital stock offerings or other instruments convertible into capital stock from various dates. Under the most restrictive of the Note Agreements, $400.8 million was available to pay dividends to AWR as of December 31, 2017. GSWC is also prohibited from paying dividends if, after giving effect to the dividend, its total indebtedness to capitalization ratio (as defined) would be more than 0.6667-to-1. Dividends in the amount of $27.7 million, $25.5 million and $62.0 million were paid to AWR by GSWC during the years ended December 31, 2017, 2016 and 2015, respectively. The ability of AWR, ASUS and GSWC to pay dividends is also restricted by California law. Under California law, AWR, GSWC and ASUS are each permitted to distribute dividends to its shareholders so long as the Board of Directors determines, in good faith, that either: (i) the value of the corporation’s assets equals or exceeds the sum of its total liabilities immediately after the dividend, or (ii) its retained earnings equals or exceeds the amount of the distribution. Under the least restrictive of the California tests, approximately $279.8 million was available to pay dividends to AWR’s shareholders at December 31, 2017. Approximately $232.2 million was available for GSWC to pay dividends to AWR at December 31, 2017. Approximately $62.0 million was available for ASUS to pay dividends to AWR as of December 31, 2017 to the extent that the subsidiaries of ASUS are able to pay dividends in that amount to ASUS under applicable state laws. |
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- Definition Entire disclosure of dividends limitations and restrictions of the reporting entity. No definition available.
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- References No definition available.
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Bank Debt |
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| Bank Debt | Bank Debt AWR has access to a $150.0 million syndicated credit facility, which expires in May 2018. Management intends to renew the credit facility prior to its expiration. The aggregate effective amount that may be outstanding under letters of credit is $25.0 million. AWR has obtained letters of credit, primarily for GSWC, in the aggregate amount of $6.3 million, with fees of 0.65% including: (i) a $5.4 million letter of credit related to American Recovery and Reinvestment Act funds received by GSWC for reimbursement of capital costs related to the installation of meters in GSWC’s Arden-Cordova water system, (ii) letters of credit in an aggregate amount of $340,000 as security for GSWC’s business automobile insurance policy, (iii) a letter of credit, in an amount of $585,000 as security for the purchase of power, and (iv) a $15,000 irrevocable letter of credit pursuant to a franchise agreement with the City of Rancho Cordova. Letters of credit outstanding reduce the amount that may be borrowed under the revolving credit facility. AWR is not required to maintain any compensating balances. Loans may be obtained under this credit facility at the option of AWR and bear interest at rates based on credit ratings and Euro rate margins. In May 2017, Standard and Poor’s Global Ratings (“S&P”) reaffirmed an A+ credit rating with a stable outlook on both AWR and GSWC. S&P's debt ratings range from AAA (highest rating possible) to D (obligation is in default). In December 2017, Moody's Investors Service ("Moody's") affirmed its A2 rating with a revised rating outlook from stable to positive for GSWC. At December 31, 2017, there was $59.0 million outstanding under this facility. At times, AWR borrows under this facility and provides loans to its subsidiaries in support of their operations, on terms that are similar to that of the credit facility. AWR’s short-term borrowing activities (excluding letters of credit) for the years ending December 31, 2017 and 2016 were as follows:
All of the letters of credit are issued pursuant to the syndicated revolving credit facility. The syndicated revolving credit facility contains restrictions on prepayments, disposition of property, mergers, liens and negative pledges, indebtedness and guaranty obligations, transactions with affiliates, minimum interest coverage requirements, a maximum debt to capitalization ratio and a minimum debt rating. Pursuant to the credit agreement, AWR must maintain a minimum interest coverage ratio of 3.25 times interest expense, a maximum total funded debt ratio of 0.65 to 1.00 and a minimum Moody’s Investor Service or S&P debt rating of Baa3 or BBB-, respectively. As of December 31, 2017, 2016 and 2015, AWR was in compliance with these requirements. As of December 31, 2017, AWR had an interest coverage ratio of 7.54 times interest expense, a debt ratio of 0.42 to 1.00 and a debt rating of A+ by S&P. |
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- Definition -- None. No documentation exists for this element. -- No definition available.
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- Definition Entire disclosure of bank debts which includes bank commitments, letter of credits, etc. of the reporting entity. No definition available.
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Long-Term Debt |
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| Debt Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||
| Long-Term Debt | Long-Term Debt Registrant’s long-term debt consists primarily of notes and debentures of GSWC. Registrant summarizes its long-term debt in the Statements of Capitalization. GSWC does not currently have any outstanding mortgages or other encumbrances on its properties. GSWC’s leases and other similar financial arrangements are not material. Each of the private placement notes issued by GSWC contain various restrictions. Private placement notes issued in the amount of $28 million due in 2031 contain restrictions on the payment of dividends, minimum interest coverage requirements, a maximum total indebtedness to capitalization ratio and a negative pledge. Pursuant to the terms of these notes, GSWC must maintain a minimum interest coverage ratio of two times interest expense. As of December 31, 2017, GSWC had an interest coverage ratio of over four times interest expense. In December 2014, GSWC issued $15.0 million in 3.45% private placement senior notes due in 2029. In 2005 and 2009, GSWC issued two senior private placement notes to CoBank, ACB ("CoBank") due in 2028 and 2019, respectively. Pursuant to the terms of these three notes, GSWC must maintain a total indebtedness to capitalization ratio (as defined) of less than 0.6667-to-1 and a total indebtedness to earnings before income taxes, depreciation and amortization ("EBITDA") of less than 8-to-1. As of December 31, 2017, GSWC had a total indebtedness to capitalization ratio of 0.4332-to-1 and a total indebtedness to EBITDA of 2.5-to-1. Certain long-term debt issues outstanding as of December 31, 2017 can be redeemed, in whole or in part, at the option of GSWC subject to redemption schedules embedded in the agreements particular to each redeemable issue. The 9.56% notes are subject to a make-whole premium based on 55 basis points above the applicable Treasury Yield if redeemed prior to 2021. After 2021, the maximum redemption premium is 3% of par value. The 5.87% and 6.7% senior notes with Co-Bank are subject to a make-whole premium based on the difference between Co-Bank’s cost of funds on the date of purchase and Co-Bank’s cost of funds on the date of redemption, plus 0.5%. The $15.0 million, 3.45% senior notes due in 2029 have similar redemption premiums. In October 2009, GSWC entered into an agreement with the California Department of Health (“CDPH”) whereby CDPH agreed to provide funds to GSWC of up to $9.0 million under the American Recovery and Reinvestment Act. Proceeds from the funds received were used to reimburse GSWC for capital costs incurred to install water meters to convert customers in GSWC’s Arden-Cordova district from non-metered service to metered service. GSWC received a total of $8.6 million in reimbursements from the CDPH, half of which was recorded as a contribution in aid of construction and the other half as long-term debt in accordance with the terms of the agreement. The loan portion bears interest at a rate of 2.5% and is payable over 20 years beginning in 2013. A surcharge to recover from customers the debt service cost on this loan was approved by the CPUC and implemented in 2013. Pursuant to the agreement, GSWC also issued letters of credit to CDPH in connection with this loan. As of December 31, 2017, GSWC has a total of $5.4 million in letters of credit issued to CDPH. Annual maturities of all long-term debt at December 31, 2017 are as follows (in thousands):
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- References No definition available.
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- Definition The entire disclosure for long-term debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Taxes on Income |
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| Income Tax Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Taxes on Income | Taxes on Income Registrant records deferred income taxes for temporary differences pursuant to the accounting guidance that addresses items recognized for income tax purposes in a different period from when these items are reported in the financial statements. These items include differences in net asset basis (primarily related to differences in depreciation lives and methods, and differences in capitalization methods) and the treatment of certain regulatory balancing accounts and construction contributions and advances. The accounting guidance for income taxes requires that rate-regulated enterprises record deferred income taxes and offsetting regulatory liabilities and assets for temporary differences where the rate regulator has prescribed flow-through treatment for ratemaking purposes (Note 2). Deferred investment tax credits (“ITC”) are amortized ratably to deferred tax expense over the remaining lives of the property that gave rise to these credits. GSWC is included in both AWR’s consolidated federal income tax and its combined California state franchise tax returns. The impact of California’s unitary apportionment on the amount of AWR’s California income tax liability is a function of both the profitability of AWR’s non-California activities and the proportion of AWR’s California sales to its total sales. GSWC’s income tax expense is computed as if GSWC were autonomous and separately files its income tax returns, which is consistent with the method adopted by the CPUC in setting GSWC’s customer rates. The AWR and GSWC effective tax rates (“ETRs”) differ from the federal statutory tax rate primarily due to state taxes, flow-through items, and permanent differences. As a regulated utility, GSWC treats certain temporary differences as flow-through in computing its income tax expense consistent with the income tax method used in its CPUC-jurisdiction ratemaking. Flow-through items either increase or decrease tax expense and thus impact the ETR. On December 22, 2017, the Tax Cuts and Jobs Act (the "Tax Act") was signed into federal law. The provisions of this major tax reform are generally effective January 1, 2018. Among its significant provisions, the Tax Act (i) reduces the federal corporate income tax rate from 35% to 21%; (ii) eliminates bonus depreciation for regulated utilities, but allows 100% expensing for the cost of qualified property for non-regulated businesses; (iii) eliminates the provision that treated contributions in aid of construction provided to regulated water utilities as non-taxable; (iv) eliminates the domestic production activities deduction, and (v) limits the amount of net interest that can be deducted; however, this limitation is not applicable to regulated utilities and, therefore is not anticipated to have a material impact to Registrant’s ability to deduct net interest. Pursuant to ASC Topic 740, "Income Taxes", the effects of changes in tax laws must be recognized within the period in which the tax law is enacted. This required AWR and GSWC to record an adjustment in its 2017 financial statements to reflect the impact of the reduction in the corporate income tax rate from 35% to 21% on its cumulative deferred income-tax balances and its tax-related regulatory assets/liabilities. Registrant was able to make reasonable estimates in order to remeasure and account for the effects of the Tax Act, which are reflected in the December 31, 2017 financial statements. Any further technical corrections or other forms of guidance addressing the Tax Act, as well as regulatory or governmental actions, could result in adjustments to Registrant's remeasurement and accounting for the effects of the Tax Act. Registrant will finalize and record any adjustments related to the Tax Act within the one-year measurement period provided under Staff Accounting Bulletin No. 118 issued by the Securities and Exchange Commission in December 2017. The most significant change from the Tax Act impacting Registrant is the reduction of the corporate federal income tax rate from 35% to 21% effective January 1, 2018. As of December 31, 2017, the cumulative net deferred income tax liabilities (for both flow-through and normalized temporary differences) related to GSWC’s rate-regulated activities were reduced by approximately $90.1 million to reflect the new 21% tax rate. However, this did not impact GSWC's earnings since this reduction in net deferred income tax liabilities was offset by a corresponding increase to a regulatory liability (Note 2). The impact to future customer rates related to this regulatory liability is anticipated to generally occur over a period consistent with the remaining lives of the property giving rise to this regulatory liability. The remeasurement of other deferred income tax balances not related to rate-regulated activities did not have a significant impact to Registrant's consolidated results of operations; however, income tax expense was affected among the reporting segments. The significant components of the deferred tax assets and liabilities as reflected in the balance sheets at December 31, 2017 and 2016 are:
(1) Primarily represents the gross-up portion of the deferred income tax (on the excess-deferred-tax regulatory liability) brought about by the Tax Act’s reduction in the federal income tax rate. The current and deferred components of income tax expense are as follows:
The reconciliations of the effective tax rates to the federal statutory rate are as follows:
AWR and GSWC had no unrecognized tax benefits at December 31, 2017, 2016 and 2015. Registrant’s policy is to classify interest on income tax over/underpayments in interest income/expense and penalties in “other operating expenses.” Registrant did not have any material interest receivables/payables from/to taxing authorities as of December 31, 2017 and 2016, nor did it recognize any material interest income/expense or accrue any material tax-related penalties during the years ended December 31, 2017, 2016 and 2015. Registrant files federal, California and various other state income tax returns. The Internal Revenue Service (“IRS”) completed its examination of AWR’s federal 2010 through 2012 refund claims in February 2016 and issued a refund to AWR of approximately $2.1 million. AWR’s 2014 - 2016 tax years remain subject to examination by the IRS. AWR filed refund claims with the California Franchise Tax Board ("FTB") for the 2002 through 2008 tax years in connection with the matters reflected on the federal refund claims along with other state tax items. In the first quarter of 2017, the FTB issued a refund to AWR for the 2002 - 2004 claims of approximately $2.2 million. The FTB continues to review the 2005 - 2008 refund claims. The 2009 - 2016 tax years remain subject to examination by the FTB. |
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- References No definition available.
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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Employee Benefit Plans |
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| Retirement Benefits [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Employee Benefit Plans | Employee Benefit Plans Pension and Post-Retirement Medical Plans: Registrant maintains a defined benefit pension plan (the “Pension Plan”) that provides eligible employees (those aged 21 and older, hired before January 1, 2011) monthly benefits upon retirement based on average salaries and length of service. The eligibility requirement to begin receiving these benefits is 5 years of vested service. The normal retirement benefit is equal to 2% of the five highest consecutive years’ average earnings multiplied by the number of years of credited service, up to a maximum of 40, reduced by a percentage of primary social security benefits. There is also an early retirement option. Annual contributions are made to the Pension Plan, which comply with the funding requirements of the Employee Retirement Income Security Act (“ERISA”). At December 31, 2017, Registrant had 949 participants in the Pension Plan. Employees hired or rehired after December 31, 2010 are eligible to participate in a defined contribution plan. Registrant's existing 401(k) Investment Incentive Program was amended to include this defined contribution plan. Under this plan, Registrant provides a contribution of 5.25% of eligible pay each pay period into investment vehicles offered by the plan’s trustee. Full vesting under this plan occurs upon three years of service. Employees hired before January 1, 2011 continue to participate in and accrue benefits under the terms of the Pension Plan. Registrant also provides post-retirement medical benefits for all active employees hired before February of 1995 through a medical insurance plan. Eligible employees, who retire prior to age 65, and/or their spouses, are able to retain the benefits under the plan for active employees until reaching age 65. Eligible employees upon reaching age 65, and those eligible employees retiring at or after age 65, and/or their spouses, receive coverage through a Medicare supplement insurance policy paid for by Registrant subject to an annual cap limit. Registrant’s post-retirement medical plan does not provide prescription drug benefits to Medicare-eligible employees and is not affected by the Medicare Prescription Drug Improvement and Modernization Act of 2003. In accordance with the accounting guidance for the effects of certain types of regulation, Registrant has established a regulatory asset for its underfunded position in its pension and post-retirement medical plans that is expected to be recovered through rates in future periods. The changes in actuarial gains and losses, prior service costs and transition assets or obligations pertaining to the regulatory asset are recognized as an adjustment to the regulatory asset account as these amounts are recognized as components of net periodic pension costs each year and in the rate-making process. The following table sets forth the Pension Plan’s and post-retirement medical plan’s funded status and amounts recognized in Registrant’s balance sheets and the components of net pension cost and accrued liability at December 31, 2017 and 2016:
* Age-graded ranging from 3.0% to 8.0%. Consistent with decisions from the CPUC and in accordance with regulatory accounting principles, Registrant capitalizes a portion of its pension and other post-retirement costs in the overhead pool included in GSWC's utility plant. The components of net periodic pension and post-retirement benefits cost, before allocation to the overhead pool, for 2017, 2016 and 2015 are as follows:
*6.0% for union plan and 4.2% for non-union (net of income taxes) in 2017, and 7.00% for union plan and 4.20% for non-union (net of income taxes) for 2016 and 2015. ** Age-graded ranging from 3.0% to 8.0%. Regulatory Adjustment: The CPUC authorized GSWC to track differences between the forecasted annual pension expenses adopted in rates for its water and electric regions and the general office, and the actual annual expense to be recorded by GSWC in accordance with the accounting guidance for pension costs. During the years ended December 31, 2017, 2016, and 2015, GSWC's actual expense was lower than the amounts included in water and electric customer rates by $583,000, $859,000 and $523,000, respectively. These annual over-collections have been recorded in the two-way pension balancing accounts included within regulatory assets. As of December 31, 2017, the pension balancing account had a $1.7 million cumulative net over-collection included within regulatory assets (Note 2). Plan Funded Status: The Pension Plan was underfunded at December 31, 2017 and 2016. Registrant’s market related value of plan assets is equal to the fair value of plan assets. Past volatile market conditions have affected the value of GSWC’s trust established to fund its future long-term pension benefits. These benefit plan assets and related obligations are measured annually using a December 31 measurement date. Changes in the Pension Plan’s funded status will affect the assets and liabilities recorded on the balance sheet in accordance with accounting guidance on employers’ accounting for defined benefit pension and other post-retirement plans. Due to Registrant’s regulatory recovery treatment, the recognition of the underfunded status for the Pension Plan has been offset by a regulatory asset pursuant to guidance on the accounting for the effects of certain types of regulation. Plan Assets: The assets of the pension and post-retirement medical plans are managed by a third party trustee. The investment policy allocation of the assets in the trust was approved by Registrant’s Administrative Committee (the “Committee”) for the pension and post-retirement medical funds, which has oversight responsibility for all retirement plans. The primary objectives underlying the investment of the pension and post-retirement plan assets are: (i) attempt to maintain a fully funded status with a cushion for unexpected developments, possible future increases in expense levels, and/or a reduction in the expected return on investments, (ii) seek to earn long-term returns that compare favorably to appropriate market indexes, peer group universes and the policy asset allocation index, (iii) seek to provide sufficient liquidity to pay current benefits and expenses, (iv) attempt to limit risk exposure through prudent diversification, and (v) seek to limit costs of administering and managing the plans. The Committee recognizes that risk and volatility are present to some degree with all types of investments. High levels of risk may be avoided through diversification by asset class, style of each investment manager and sector and industry limits. Investment managers are retained to manage a pool of assets and allocate funds in order to achieve an appropriate, diversified and balanced asset mix. The Committee’s strategy balances the requirement to maximize returns using potentially higher-return generating assets, such as equity securities, with the need to control the risk of its benefit obligations with less volatile assets, such as fixed-income securities. The Committee approves the target asset allocations. Registrant’s pension and post-retirement plan weighted-average asset allocations at December 31, 2017 and 2016, by asset category are as follows:
Equity securities did not include AWR’s Common Shares as of December 31, 2017 and 2016.
The Pension Plan assets are in collective trust funds managed by a management firm appointed by the Committee. The fair value of these collective trust funds is measured using net asset value per share. In accordance with ASU 2015-07 Disclosures for Investments in Certain Entities that Calculate Net Asset Value per Share (or Its Equivalents), the fair value of the collective trust funds is not categorized in the fair value hierarchy as of December 31, 2017 and 2016. The following tables set forth the fair value, measured by net asset value, of the pension investment assets as of December 31, 2017 and 2016:
The collective trust funds may be invested or redeemed daily, and generally do not have any significant restrictions to redeem the investments. As previously discussed in Note 1, the accounting guidance for fair value measurements establishes a framework for measuring fair value and requires fair value measurements to be classified and disclosed in one of three levels. As required by the accounting guidance, assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. All equity investments in the post-retirement medical plan are Level 1 investments in mutual funds. The fixed income category includes corporate bonds and notes. The majority of fixed income investments range in maturities from less than one to twenty years. The fair values of these investments are based on quoted market prices in active markets. The following tables set forth by level, within the fair value hierarchy, the post-retirement plan's investment assets measured at fair value as of December 31, 2017 and 2016:
Plan Contributions: During 2017, Registrant contributed $6.5 million to its pension plan and did not make a contribution to the post-retirement medical plan. Registrant currently expects to contribute approximately $6.1 million to its pension plan in 2018. Registrant’s policy is to fund the plans annually at a level which is deductible for income tax purposes and is consistent with amounts recovered in customer rates. Benefit Payments: Estimated future benefit payments at December 31, 2017 for the next five years and thereafter are as follows (in thousands):
Assumptions: Certain actuarial assumptions, such as the discount rate, long-term rate of return on plan assets, mortality, and the healthcare cost trend rate have a significant effect on the amounts reported for net periodic benefit cost as well as the related benefit obligation amounts. During 2015, Registrant updated other key assumptions used for the valuation of the pension, post-retirement medical and supplemental executive retirement plans. These updates included: (i) updates in demographic assumptions, such as retirement and termination rates, to reflect recent changes in participant behavior, and (ii) salary increases based on Registrant’s recent and future expected experience. Discount Rate — The assumed discount rate for pension and post-retirement medical plans reflects the market rates for high-quality corporate bonds currently available. Registrant’s discount rates were determined by considering the average of pension yield curves constructed of a large population of high quality corporate bonds. The resulting discount rate reflects the matching of plan liability cash flows to the yield curves. Expected Long-Term Rate of Return on Assets — The long-term rate of return on plan assets represents an estimate of long-term returns on an investment portfolio consisting of a mixture of equities, fixed income and other investments. To develop the expected long-term rate of return on assets assumption for the pension plan, Registrant considered the historical returns and the future expectations for returns for each asset class, as well as the target asset allocation of the pension portfolio. Registrant’s policy is to fund the medical benefit trusts based on actuarially determined amounts as allowed in rates approved by the CPUC. Registrant has invested the funds in the post-retirement trusts that will achieve a desired return and minimize amounts necessary to recover through rates. The mix is expected to provide for a return on assets similar to the Pension Plan and to achieve Registrant’s targeted allocation. This resulted in the selection in 2017 of the 6.0% long-term rate of return on assets assumption for the union plan and 4.2% (net of income taxes) for the non-union plan portion of the post-retirement plan. Mortality — Mortality assumptions are a critical component of benefit obligation amounts and a key factor in determining the expected length of time for annuity payments. In 2014, the Society of Actuaries ("SOA") released new mortality tables for pension plans. Beginning with 2014, the benefit obligation amounts assumed a longer life expectancy of participants as a result of the actuarial update to mortality tables. In 2016, the SOA published updated mortality tables reflecting three additional years of data and refined certain parameters used in developing the 2014 tables. Accordingly, the benefit obligation amounts as of December 31, 2017 and 2016 have incorporated the latest updates to the mortality tables. Healthcare Cost Trend Rate — The assumed health care cost trend rate for 2018 starts at 6.2% grading down to 4.5% in 2038 for those under age 65, and at 6.2% grading down to 4.4% in 2038 for those 65 and over. Assumed health care cost trend rates have a significant effect on the amounts reported for the health care plans. A one-percentage-point change in assumed health care cost trend rates would have the following effects on the post-retirement medical plan:
Supplemental Executive Retirement Plan: Registrant has a supplemental executive retirement plan (“SERP”) that provides additional retirement benefits to certain key employees and officers of Registrant by making up benefits that are limited by Sections 415 and 401(a)(17) of the Internal Revenue Code of 1986, as amended, and certain additional benefits. The Board of Directors approved the establishment of a Rabbi Trust created for the SERP. Assets in a Rabbi Trust can be subject to the claims of creditors; therefore, they are not considered as an asset for purposes of computing the SERP’s funded status. As of December 31, 2017, the balance in the Rabbi Trust totaled $15.2 million and is included in Registrant’s other property and investments. All equity investments in the Rabbi Trust are Level 1 investments in mutual funds. The fixed income category includes corporate bonds and notes. The fair values of these investments are based on quoted market prices in active markets. The following tables set forth by level, within the fair value hierarchy, the Rabbi Trust investment assets measured at fair value as of December 31, 2017 and 2016:
The following provides a reconciliation of benefit obligations, funded status of the SERP, as well as a summary of significant estimates at December 31, 2017 and 2016:
The components of SERP expense, before allocation to the overhead pool, for 2017, 2016 and 2015 are as follows:
Benefit Payments: Estimated future benefit payments for the SERP at December 31, 2017 for the next ten years are as follows (in thousands):
401(k) Investment Incentive Program: Registrant has a 401(k) Investment Incentive Program under which employees may invest a percentage of their pay, up to a maximum investment prescribed by law, in an investment program managed by an outside investment manager. Registrant’s cash contributions to the 401(k) are based upon a percentage of individual employee contributions and for the years ended December 31, 2017, 2016 and 2015 were $2.3 million, $2.2 million and $2.1 million, respectively. The Investment Incentive Program also incorporates the defined contribution plan for employees hired on or after January 1, 2011. Contributions to the defined contribution plan for the years ended December 31, 2017, 2016 and 2015 were $1.1 million, $951,000 and $755,000, respectively. |
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- References No definition available.
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- Definition The entire disclosure for pension and other postretirement benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Stock-Based Compensation Plans |
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Stock-Based Compensation Plans | Stock-Based Compensation Plans Summary Description of Stock Incentive Plans As of December 31, 2017, AWR had five stock incentive plans: the 2000, 2008 and 2016 stock incentive plans for its employees, and the 2003 and 2013 non-employee directors plans for its Board of Directors, each more fully described below. 2000, 2008 and 2016 Employee Plans — AWR adopted these employee plans, following shareholder approval, to provide stock-based incentive awards in the form of stock options, restricted stock units and restricted stock to employees as a means of promoting the success of Registrant by attracting, retaining and more fully aligning the interests of employees with those of customers and shareholders. The 2008 and 2016 employee plans also provide for the grant of performance awards. No additional grants may be made under the 2000 or 2008 employee plans. No restricted stock grants are currently outstanding under either the 2000 or 2008 employee plans and, as of January 28, 2018, no stock options were outstanding under the 2000 plan. For stock options, Registrant’s Compensation Committee of the Board of Directors (“Compensation Committee”) determines, among other things, the date of grant, the form, term, option exercise price, vesting and exercise terms of each option. Stock options granted by AWR have been in the form of nonqualified stock options, expire 10 years from the date of grant, vest over a period of 3 years and are subject to earlier termination as provided in the form of option agreements approved by the Compensation Committee. The option price per share is determined by the Compensation Committee at the time of grant but may not be less than the fair market value of AWR's Common Shares on the date of grant. For restricted stock unit awards, the Compensation Committee determines the specific terms, conditions and provisions relating to each restricted stock unit. Each employee who has been granted a time-vested restricted stock unit is entitled to dividend equivalent rights in the form of additional restricted stock units until vesting of the time-vested restricted stock units. In general, time-vested restricted stock units vest over a period of 3 years. Restricted stock units may also vest upon retirement if the grantee is at least 55 and the sum of the grantee's age and years of service are equal to or greater than 75, or upon death or total disability. In addition, restricted stock units may vest following a change in control if the Company terminates the grantee other than for cause or the employee terminates employment for good reason. Each restricted stock unit is non-voting and entitles the holder of the restricted stock unit to receive one Common Share. The Compensation Committee also has the authority to determine the number, amount or value of performance awards, the duration of the performance period or performance periods applicable to the award and the performance criteria applicable to each performance award for each performance period. Each outstanding performance award granted by the Compensation Committee has been in the form of restricted stock units that generally vest over a period of three years as provided in the performance award agreement. The amount of the performance award paid to an employee depends upon satisfaction of performance criteria following the end of a three-year performance period. Performance awards may also vest and be payable upon retirement if the grantee is at least 55 and the sum of the grantee's age and years of service are equal to or greater than 75, or upon death or total disability, with adjustments which take into account the shortened performance period for death and disability. In addition, performance awards may vest following a change in control if the Company terminates the grantee other than for cause or the employee terminates employment for good reason, subject to adjustments which take into account the shortened performance period. 2003 and 2013 Directors Plans — The Board of Directors and shareholders of AWR have approved the 2003 and 2013 directors plans in order to provide the non-employee directors with supplemental stock-based compensation to encourage them to increase their stock ownership in AWR. No more grants may be made under the 2003 directors plan. Non-employee directors are entitled to receive restricted stock units in an amount determined by the board of directors. This amount may not exceed two times the annual retainer paid to directors. Effective for grants of restricted stock units to non-employee directors after 2012, such units are convertible to AWR's Common Shares ninety days after the grant date. All non-employee directors of AWR who were directors of AWR at the 2003 annual meeting have also received restricted stock units which will be distributed upon termination of the director's service as a director. All stock options, restricted stock units and performance awards have been granted with dividend equivalent rights payable in the form of additional restricted stock units. Recognition of Compensation Expense Registrant recognizes compensation expense related to the fair value of stock-based compensation awards. Share-based compensation cost is measured at the grant date, based on the calculated fair value of the award, and is recognized as an expense over the employee’s requisite service period (generally the vesting period of the equity grant). Immediate vesting occurs if the employee is at least 55 years old and the sum of the employee’s age and years of employment is equal to or greater than 75. Registrant assumes that pre-vesting forfeitures will be minimal, and recognizes pre-vesting forfeitures as they occur, which results in a reduction in compensation expense. The following table presents share-based compensation expenses for the years ended December 31, 2017, 2016 and 2015. These expenses resulting from restricted stock units, including performance awards, are included in administrative and general expenses in AWR's and GSWC’s statements of income:
Equity-based compensation cost, capitalized as part of GSWC's utility plant for the years ended December 31, 2017, 2016 and 2015 was $195,000, $155,000 and $369,000, respectively, for both AWR and GSWC. For the years ended December 31, 2017, 2016 and 2015, AWR realized approximately $1.0 million, $581,000 and $877,000, respectively, of tax benefits from stock-based awards. For the years ended December 31, 2017, 2016 and 2015, GSWC realized approximately $1.0 million, $501,000 and $872,000, respectively, of tax benefits from stock-based awards. Registrant amortizes stock-based compensation over the requisite (vesting) period for the entire award. Options issued pursuant to the 2008 employee plan vest and are exercisable in installments of 33% the first two years and 34% in the third year, starting one year from the date of the grant and expire 10 years from the date of the grant. No stock options have been granted under the 2016 employee plan. Time-vesting restricted stock units vest and become nonforfeitable in installments of 33% the first two years and 34% in the third year, starting one year from the date of the grant. Outstanding performance awards vest and become nonforfeitable in installments of 33% the first two years and 34% in the third year and are distributed at the end of the performance period if the performance criteria set forth in the award agreement are satisfied. Stock Options — There were no stock options granted during the years 2017, 2016 or 2015. A summary of stock option activity as of December 31, 2017 and changes during the year ended December 31, 2017, are presented below:
The aggregate intrinsic value in the table above represents the total pretax intrinsic value (i.e., the difference between the closing price of AWR's Common Shares on the last trading day of the 2017 calendar year and the exercise price, times the number of shares) that would have been received by the option holders had all option holders exercised their option on December 31, 2017. This amount changes if the fair market value of the Common Shares changes. The total intrinsic value of options exercised during the years ended December 31, 2017, 2016 and 2015 was approximately $1,718,000, $308,000 and $1,457,000, respectively. During the years ended December 31, 2017, 2016 and 2015, Registrant received approximately $909,000, $235,000 and $1,198,000, respectively, in cash proceeds from the exercise of its stock options. Restricted Stock Units (Time-Vested) — A restricted stock unit (“RSU”) represents the right to receive a share of AWR’s Common Shares and are valued based on the fair market value of AWR's Common Shares on the date of grant. The fair value of RSUs were determined based on the closing trading price of Common Shares on the grant date. A summary of the status of Registrant’s outstanding RSUs, excluding performance awards, to employees and directors as of December 31, 2017, and changes during the year ended December 31, 2017, is presented below:
As of December 31, 2017, there was approximately $824,000 of total unrecognized compensation cost related to time-vested restricted stock units granted under AWR’s employee and director’s stock plans. That cost is expected to be recognized over a weighted average period of 1.36 years. Restricted Stock Units (Performance Awards) – During the years ended December 31, 2017, 2016 and 2015, the Compensation Committee granted performance awards in the form of restricted stock units to officers of the Registrant. A performance award represents the right to receive a share of AWR's Common Shares if specified performance goals are met over the performance period specified in the grant (generally three years). Each grantee of any outstanding performance award may earn between 0% and 200% of the target amount depending on Registrant's performance against performance goals, which are determined by the Compensation Committee on the date of grant. As determined by the Compensation Committee, the performance awards granted during the years ended December 31, 2017, 2016 and 2015 included various performance-based conditions and one market-based condition related to total shareholder return ("TSR") that will be earned based on Registrant’s TSR compared to the TSR for a specific peer group of investor-owned water companies. A summary of the status of Registrant’s outstanding performance awards to officers as of December 31, 2017, and changes during the year ended December 31, 2017, is presented below:
A portion of the fair value of performance awards was estimated at the grant date based on the probability of satisfying the market-based condition using a Monte-Carlo simulation model, which assesses the probabilities of various outcomes of the market condition. The portion of the fair value of the performance awards associated with performance-based conditions was based on the fair market value of AWR's Common Shares at the grant date. The fair value of each outstanding performance award grant is amortized into compensation expense in installments of 33% the first two years and 34% in the third year of their respective vesting periods, which is generally over 3 years unless earlier vested pursuant to the terms of the agreement. The accrual of compensation costs is based on the estimate of the final expected value of the award and is adjusted as required for the portion based on the performance-based condition. Unlike the awards with performance-based conditions, for the portion based on the market-based condition, compensation cost is recognized, and not reversed, even if the market condition is not achieved, as required by the accounting guidance for share-based awards. As of December 31, 2017, $1,059,000 of unrecognized compensation costs related to performance awards is expected to be recognized over a weighted average period of 1.58 years. |
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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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Commitments |
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Dec. 31, 2017 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risks and Uncertainties [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Commitments | Commitments GSWC’s Water Supply: GSWC obtains its water supply from its operating wells and purchases from others, principally member agencies of the Metropolitan Water District of Southern California (“MWD”). MWD is a public agency and quasi-municipal corporation created in 1928 by a vote of the electorates of several Southern California cities. MWD’s primary purpose was and is to provide a supplemental supply of water for domestic and municipal uses and purposes at wholesale rates to its member public agencies. GSWC has connections to MWD’s water distribution facilities and those of other member water agencies. MWD’s principal sources of water are the State Water Project and the Colorado River. GSWC has contracts to purchase water or water rights for an aggregate amount of $4.8 million as of December 31, 2017. Included in the $4.8 million is a commitment of $2.4 million to lease water rights from a third party under an agreement which expires in 2028. The remaining $2.4 million are commitments for purchased water with other third parties which expire through 2038. GSWC’s estimated future minimum payments under these purchased water supply commitments at December 31, 2017 are as follows (in thousands):
Bear Valley Electric Service: Generally, BVES purchases power at a fixed cost, under long-term purchased power contracts, depending on the amount of power and the period during which the power is purchased under such contracts. BVES began taking power pursuant to purchased power contracts approved by the CPUC effective January 1, 2015 at a fixed cost over three and five year terms depending on the amount of power and period during which the power is purchased under the contracts. The three-year contract expired in 2017. As of December 31, 2017, GSWC's commitment under BVES's remaining contract totaled approximately $9.6 million. Operating Leases: Registrant leases equipment and facilities primarily for its Regional and District offices and ASUS operations under non-cancelable operating leases with varying terms, provisions and expiration dates. Rent expense for leases that contain scheduled rent increases are recorded on a straight-line basis. During 2017, 2016 and 2015, Registrant’s consolidated rent expense was approximately $2,448,000, $2,298,000 and $2,740,000, respectively. Registrant’s future minimum payments under long-term non-cancelable operating leases at December 31, 2017 are as follows (in thousands):
There is no material difference between the consolidated operations of AWR and the operations of GSWC in regard to the future minimum payments under long-term non-cancelable operating leases. |
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- Definition The entire disclosure for significant arrangements with third parties, which includes operating lease arrangements and arrangements in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services, and operating lease arrangements. Descriptions may include identification of the specific goods and services, period of time covered, minimum quantities and amounts, and cancellation rights. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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Contingencies |
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Dec. 31, 2017 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Commitments and Contingencies Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Contingencies | Contingencies and Gain on Sale of Assets Condemnation of Properties: The laws of the State of California provide for the acquisition of public utility property by governmental agencies through their power of eminent domain, also known as condemnation, where doing so is necessary and in the public interest. In addition, these laws provide that the owner of utility property (i) may contest whether the condemnation is necessary and in the public interest, and (ii) is entitled to receive the fair market value of its property if the property is ultimately taken. Claremont System: In December 2014, the City of Claremont, California (“Claremont”) filed an eminent-domain action against GSWC to condemn GSWC's Claremont water system. In December 2016, the County of Los Angeles Superior Court (the “Court”) issued a decision rejecting Claremont’s attempt to take over GSWC’s Claremont water system. In February 2017, the Court further ordered that GSWC is entitled to recover $7.6 million (“Judgment Amount”) of its litigation expenses and related defense costs from Claremont. During the first quarter of 2017, Claremont appealed both decisions. In October 2017, GSWC and Claremont entered into a settlement agreement whereby Claremont agreed to drop its appeals and in December 2017 paid $2.0 million to GSWC as partial satisfaction of the Judgment Amount, plus interest accrued through the end of 2017. GSWC recorded the $2.0 million as a reduction to legal fees of $1.8 million and an increase in interest income of $200,000 in the fourth quarter of 2017. Furthermore, quarterly interest-only payments calculated on the unpaid Judgment Amount of $5.9 million are to be made by Claremont to GSWC over the next twelve years. If Claremont (i) makes all of the quarterly payments as required, and (ii) does not take formal action to condemn GSWC's Claremont water system before December 31, 2029, then on January 1, 2030, the unpaid Judgment Amount will be deemed satisfied by Claremont without further payment required to be made to GSWC. However, if Claremont were to take formal action within the next 12 years or miss any of the required payments specified in the settlement agreement, the unpaid Judgment Amount and any unpaid accrued interest would immediately become due and payable. GSWC is unable to predict the actions that Claremont will take over the next 12 years and, as a result, will record the quarterly payments only to the extent that they are collected from Claremont over this period. GSWC serves approximately 11,000 customers in Claremont. Ojai Water System and Gain on Sale of Assets: On April 12, 2017, the Board of Directors of Casitas Municipal Water District (“Casitas”) approved a settlement agreement with GSWC, and a group of citizens referred to as Ojai Friends of Locally Owned Water (“Ojai FLOW”), to resolve the eminent domain action and other litigation brought by Casitas and Ojai FLOW against GSWC. In accordance with the terms of the settlement agreement, on June 8, 2017 Casitas acquired the operating assets of GSWC’s 2,900-connection Ojai water system by eminent domain for $34.3 million in cash, including payments for customer receivables and regulatory assets, and Casitas and Ojai FLOW dismissed all claims against GSWC. As a result of this transaction, GSWC recorded a pretax gain of $8.3 million on the sale of the Ojai water system during the second quarter of 2017. The proceeds received from this transaction were used to repay a portion of GSWC’s short-term borrowings. On June 8, 2017, the closing date of the transaction, the assets and liabilities related to the Ojai water system acquired and assumed by Casitas were as follows:
Environmental Clean-Up and Remediation: GSWC has been involved in environmental remediation and cleanup at a plant site (“Chadron Plant”) that contained an underground storage tank which was used to store gasoline for its vehicles. This tank was removed from the ground in July 1990 along with the dispenser and ancillary piping. Since then, GSWC has been involved in various remediation activities at this site. Analysis indicates that offsite monitoring wells may also be necessary to document effectiveness of remediation. As of December 31, 2017, the total spent to clean-up and remediate the Chadron Plant was approximately $5.3 million, of which $1.5 million has been paid by the State of California Underground Storage Tank Fund. Amounts paid by GSWC have been included in rate base and approved by the CPUC for recovery. As of December 31, 2017, GSWC has a regulatory asset and an accrued liability for the estimated remaining cost of $1.3 million to complete the cleanup at the site. The estimate includes costs for two years of continued activities of groundwater cleanup and monitoring, future soil treatment and site-closure-related activities. The ultimate cost may vary as there are many unknowns in remediation of underground gasoline spills and this is an estimate based on currently available information. Management also believes it is probable that the estimated additional costs will be approved in rate base by the CPUC. Other Litigation: Registrant is also subject to other ordinary routine litigation incidental to its business, some of which may include claims for compensatory and punitive damages. Management believes that rate recovery, proper insurance coverage and reserves are in place to insure against, among other things, property, general liability, employment, and workers’ compensation claims incurred in the ordinary course of business. Insurance coverage may not cover certain claims involving punitive damages. However, Registrant does not believe the outcome from any pending suits or administrative proceedings will have a material effect on Registrant's consolidated results of operations, financial position or cash flows. |
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- References No definition available.
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| X | ||||||||||
- Definition The entire disclosure for legal proceedings, legal contingencies, litigation, regulatory and environmental matters and other contingencies. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
Business Segments |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2017 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Segment Reporting [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Business Segments | Business Segments AWR has 3 reportable segments, water, electric and contracted services, whereas GSWC has 2 segments, water and electric. AWR has no material assets other than its investments in its subsidiaries on a stand-alone basis. All activities of GSWC are geographically located within California. Activities of ASUS and the Military Utility Privatization Subsidiaries are conducted in California, Florida, Georgia, Maryland, New Mexico, North Carolina, South Carolina, Texas and Virginia. In September 2017, ASUS was awarded a new 50-year contract by the U.S. government for water and wastewater operations at Fort Riley located in Kansas. ASUS expects to assume operations at Fort Riley following the completion of a six-to-twelve-month transition period currently underway. Each of the Military Utility Privatization Subsidiaries is regulated, if applicable, by the state in which the subsidiary primarily conducts water and/or wastewater operations. Fees charged for operations and maintenance and renewal and replacement services are based upon the terms of the contracts with the U.S. government which have been filed, as appropriate, with the commissions in the states in which ASUS’s subsidiaries are incorporated. The tables below set forth information relating to GSWC’s operating segments, ASUS and the Military Utility Privatization Subsidiaries and other matters. Total assets by segment are not presented below, as certain of Registrant’s assets are not tracked by segment. The utility plant balances are net of respective accumulated provisions for depreciation. Capital additions reflect capital expenditures paid in cash and exclude U.S. government-funded and third-party prime funded capital expenditures for ASUS and property installed by developers and conveyed to GSWC.
____________________________ (1) Depreciation computed on GSWC’s transportation equipment is recorded in other operating expenses and totaled $242,000, $259,000 and $641,000 for the years ended December 31, 2017, 2016 and 2015, respectively. The following table reconciles total utility plant (a key figure for rate-making) to total consolidated assets (in thousands):
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Allowance for Doubtful Accounts |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2017 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Allowance for Doubtful Accounts | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Allowance for Doubtful Accounts | Allowance for Doubtful Accounts The table below presents Registrant’s provision for doubtful accounts charged to expense and accounts written off, net of recoveries. Provisions included in 2017, 2016, and 2015 for AWR and GSWC are as follows:
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| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
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| X | ||||||||||
- Definition Entire disclosure of allowance on doubtful accounts of the reporting entity. No definition available.
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Supplemental Cash Flow Information |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2017 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplemental Cash Flow Elements [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplemental Cash Flow Information | Supplemental Cash Flow Information The following table sets forth non-cash financing and investing activities and other cash flow information (in thousands).
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| X | ||||||||||
- Definition The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2017 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Condensed Financial Information of Parent Company Only Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT | CONDENSED BALANCE SHEETS
The accompanying condensed notes are an integral part of these condensed financial statements. CONDENSED STATEMENTS OF INCOME
The accompanying condensed notes are an integral part of these condensed financial statements. CONDENSED STATEMENTS OF CASH FLOWS
The accompanying condensed notes are an integral part of these condensed financial statements. Basis of Presentation The accompanying condensed financial statements of AWR (parent) should be read in conjunction with the consolidated financial statements and notes thereto of American States Water Company and subsidiaries (“Registrant”) included in Part II, Item 8 of this Form 10-K. AWR’s (parent) significant accounting policies are consistent with those of Registrant and its wholly owned subsidiaries, Golden State Water Company (“GSWC”) and American States Utility Services, Inc. ("ASUS"), except that all subsidiaries are accounted for as equity method investments. Related-Party Transactions: As further discussed in Note 2 — Notes Payable to Banks, AWR (parent) has access to a $150.0 million syndicated credit facility. AWR (parent) borrows under this facility and provides funds to its subsidiaries, in support of their operations. Any amounts owed to AWR (parent) for borrowings under this facility are reflected as inter-company receivables on the condensed balance sheets. The interest rate charged to the subsidiaries is sufficient to cover AWR (parent)’s interest cost under the credit facility. In October 2015, AWR issued interest bearing promissory notes (the "Notes") to GSWC and ASUS for $40 million and $10 million, respectively, which expire on May 23, 2018. Under the terms of the Notes, AWR may borrow from GSWC and ASUS amounts up to $40 million and $10 million, respectively, for working capital purposes. AWR agrees to pay any unpaid principal amounts outstanding under these notes, plus accrued interest. As of December 31, 2017 and 2016, there were no amounts outstanding under these notes. AWR (parent) guarantees performance of ASUS's military privatization contracts and agrees to provide necessary resources, including financing, which are necessary to assure the complete and satisfactory performance of such contracts. Note Payable to Banks AWR (parent) has access to a $150.0 million syndicated credit facility, which expires in May 2018. Management intends to renew the credit facility prior to its expiration. The aggregate effective amount that may be outstanding under letters of credit is $25.0 million. AWR has obtained letters of credit, primarily for GSWC, in the aggregate amount of $6.3 million, with fees of 0.65% including: (i) a $5.4 million letter of credit related to American Recovery and Reinvestment Act funds received by GSWC for reimbursement of capital costs related to the installation of meters in GSWC’s Arden-Cordova water system, (ii) letters of credit in an aggregate amount of $340,000 as security for GSWC’s business automobile insurance policy, (iii) a letter of credit in an amount of $585,000 as security for the purchase of power, and (iv) a $15,000 irrevocable letter of credit pursuant to a franchise agreement with the City of Rancho Cordova. Letters of credit outstanding reduce the amount that may be borrowed under the revolving credit facility. AWR was not required to maintain any compensating balances. Loans can be obtained under this credit facility at the option of AWR and bear interest at rates based on credit ratings and Euro rate margins. In May 2017, Standard and Poor’s Global Ratings (“S&P”) reaffirmed an A+ credit rating with a stable outlook on both AWR and GSWC. S&P’s debt ratings range from AAA (highest possible) to D (obligation is in default). In December 2017, Moody's Investors Service ("Moody's") affirmed its A2 rating with a revised rating outlook from stable to positive for GSWC. At December 31, 2017, there was $59.0 million outstanding under this facility. At times, AWR (parent) borrows under this facility and provides loans to its subsidiaries in support of its operations, under terms that are similar to that of the credit facility. AWR’s (parent) short-term borrowing activities (excluding letters of credit) for the years ended December 31, 2017 and 2016 were as follows:
All of the letters of credit are issued pursuant to the syndicated revolving credit facility. The syndicated revolving credit facility contains restrictions on prepayments, disposition of property, mergers, liens and negative pledges, indebtedness and guaranty obligations, transactions with affiliates, minimum interest coverage requirements, a maximum debt to capitalization ratio and a minimum debt rating. Pursuant to the credit agreement, AWR must maintain a minimum interest coverage ratio of 3.25 times interest expense, a maximum total funded debt ratio of 0.65 to 1.00 and a minimum debt rating from Moody’s or S&P of Baa3 or BBB-, respectively. As of December 31, 2017, AWR was in compliance with these covenants with an interest coverage ratio of 7.54 times interest expense, a debt ratio of 0.42 to 1.00 and a debt rating of A+ by S&P. Income Taxes AWR (parent) receives a tax benefit for expenses incurred at the parent-company level. AWR (parent) also recognizes the effect of AWR’s consolidated California unitary apportionment, which is beneficial or detrimental depending on a combination of the profitability of AWR’s consolidated non-California activities as well as the proportion of its consolidated California sales to total sales. Dividend from Subsidiaries Dividends in the amount of $36.5 million, $33.8 million and $62.0 million were paid to AWR (parent) by its wholly owned subsidiaries during the years ended December 31, 2017, 2016 and 2015, respectively. |
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- Definition The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Quarterly Financial Data (Unaudited) (Notes) |
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| Quarterly Financial Data [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Quarterly Financial Information | Note 18 — Selected Quarterly Financial Data (Unaudited) The quarterly financial information presented below is unaudited. Registrant's business is seasonal, and it is management’s opinion that comparisons of earnings for the quarterly periods do not reflect overall trends and changes in Registrant’s operations.
* The sum of the quarterly 2017 basic earnings per share amounts do not agree to the yearly total due to rounding.
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- References No definition available.
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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Summary of Significant Accounting Policies (Policies) |
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| Accounting Policies [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Nature of Operations and Basis of Presentation | Nature of Operations: American States Water Company (“AWR”) is the parent company of Golden State Water Company (“GSWC”) and American States Utility Services, Inc. (“ASUS”) (and its wholly owned subsidiaries, Fort Bliss Water Services Company (“FBWS”), Terrapin Utility Services, Inc. (“TUS”), Old Dominion Utility Services, Inc. (“ODUS”), Palmetto State Utility Services, Inc. (“PSUS”), Old North Utility Services, Inc. (“ONUS”), Emerald Coast Utility Services, Inc. (“ECUS”), and Fort Riley Utility Services, Inc. ("FRUS")). AWR and its subsidiaries may be collectively referred to as “Registrant” or “the Company.” The subsidiaries of ASUS are collectively referred to as the “Military Utility Privatization Subsidiaries.” GSWC is a public utility engaged principally in the purchase, production, distribution and sale of water in California serving approximately 259,000 customers. GSWC also distributes electricity in several San Bernardino County mountain communities in California serving approximately 24,000 customers through its Bear Valley Electric Service (“BVES”) division. Although Registrant has a diversified base of residential, industrial and other customers, revenues derived from commercial and residential water customers accounted for approximately 90% of total water revenues in 2017, 2016 and 2015. The California Public Utilities Commission (“CPUC”) regulates GSWC’s water and electric businesses in matters including properties, rates, services, facilities, and transactions by GSWC with its affiliates. ASUS, through its Military Utility Privatization Subsidiaries, operates, maintains and performs construction activities (including renewal and replacement capital work) on water and/or wastewater systems at various U.S. military bases pursuant to 50-year firm fixed-price contracts. These contracts are subject to annual economic price adjustments and modifications for changes in circumstances, changes in laws and regulations and additions to the contract value for new construction of facilities at the military bases. In September 2017, ASUS was awarded a new 50-year contract by the U.S. government to operate, maintain, and provide construction management services for the water distribution and wastewater collection and treatment facilities at Fort Riley, a United States Army installation located in Kansas. The contract over the 50-year period is subject to annual economic price adjustments. ASUS expects to assume operations at Fort Riley following the completion of a six-to-twelve-month transition period currently underway. There is no direct regulatory oversight by the CPUC over AWR or the operations, rates or services provided by ASUS or the Military Utility Privatization Subsidiaries. Basis of Presentation: The consolidated financial statements and notes thereto are presented in a combined report filed by two separate Registrants: AWR and GSWC. References in this report to “Registrant” are to AWR and GSWC, collectively, unless otherwise specified. AWR owns all of the outstanding Common Shares of GSWC and ASUS. ASUS owns all of the outstanding Common shares of the Military Utility Privatization Subsidiaries. The consolidated financial statements of AWR include the accounts of AWR and its subsidiaries. These financial statements are prepared in conformity with accounting principles generally accepted in the United States of America. Inter-company transactions and balances have been eliminated in the AWR consolidated financial statements. |
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| Related Party Transactions: | Related-Party Transactions: GSWC and ASUS provide and/or receive various support services to and from their parent, AWR, and among themselves. GSWC also allocates certain corporate office administrative and general costs to its affiliate, ASUS, using allocation factors approved by the CPUC. During the years ended December 31, 2017, 2016 and 2015, GSWC allocated to ASUS approximately $4.0 million, $3.9 million and $2.6 million, respectively, of corporate office administrative and general costs. In addition, AWR has a $150.0 million syndicated credit facility, which expires in May 2018. Management intends to renew the credit facility prior to its expiration. AWR borrows under this facility and provides funds to its subsidiaries, including GSWC, in support of their operations. The interest rate charged to GSWC and ASUS is sufficient to cover AWR’s interest cost under the credit facility. Amounts owed to GSWC by AWR, including for allocated expenses, are included in GSWC's inter-company receivables as of December 31, 2017 and 2016. In October 2015, AWR issued interest-bearing promissory notes (the "Notes") to GSWC and ASUS for $40 million and $10 million, respectively, which expire in May 2018. Under the terms of the Notes, AWR may borrow from GSWC and ASUS amounts up to $40 million and $10 million, respectively, for working capital purposes. AWR agrees to pay any unpaid principal amounts outstanding under these notes, plus accrued interest. As of December 31, 2017 and 2016, there were no amounts outstanding under these notes. |
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| Utility Accounting: | Utility Accounting: Registrant’s accounting policies conform to accounting principles generally accepted in the United States of America ("U.S. GAAP"), including the accounting principles for rate-regulated enterprises, which reflect the ratemaking policies of the CPUC and the Federal Energy Regulatory Commission. GSWC has incurred various costs and received various credits reflected as regulatory assets and liabilities. Accounting for such costs and credits as regulatory assets and liabilities is in accordance with the guidance for accounting for the effects of certain types of regulation. This guidance sets forth the application of U.S. GAAP for those companies whose rates are established by or are subject to approval by an independent third-party regulator. Under such accounting guidance, rate-regulated entities defer costs and credits on the balance sheet as regulatory assets and liabilities when it is probable that those costs and credits will be recognized in the ratemaking process in a period different from the period in which they would have been reflected in income by an unregulated company. These regulatory assets and liabilities are then recognized in the income statement in the period in which the same amounts are reflected in the rates charged for service. The amounts included as regulatory assets and liabilities that will be collected or refunded over a period exceeding one year are classified as long-term assets and liabilities as of December 31, 2017 and 2016. |
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| Property and Depreciation: | Property and Depreciation: Registrant's property consists primarily of regulated utility plant at GSWC. GSWC capitalizes, as utility plant, the cost of construction and the cost of additions, betterments and replacements of retired units of property. Such cost includes labor, material and certain indirect charges. Water systems acquired are recorded at estimated original cost of utility plant when first devoted to utility service and the applicable depreciation is recorded to accumulated depreciation. The difference between the estimated original cost, less accumulated depreciation, and the purchase price, if recognized by the regulator, is recorded as an acquisition adjustment within utility plant. Depreciation is computed on the straight-line, remaining-life basis, group method, in accordance with the applicable ratemaking process. GSWC's provision for depreciation expressed as a percentage of the aggregate depreciable asset balances was 2.6% for 2017, 2.9% for 2016, and 3.2% for 2015. Depreciation computed on GSWC’s transportation equipment is recorded in other operating expenses and totaled $242,000, $259,000 and $641,000 for the years ended December 31, 2017, 2016 and 2015, respectively. Expenditures for maintenance and repairs are expensed as incurred. Replaced or retired property costs, including cost of removal, are charged to the accumulated provision for depreciation. Estimated useful lives of GSWC’s utility plant, as authorized by the CPUC, are as follows:
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| Asset Retirement Obligations: | Asset Retirement Obligations: GSWC has a legal obligation for the retirement of its wells, which by law need to be properly capped at the time of removal. As such, GSWC incurs asset retirement obligations. GSWC records the fair value of a liability for these asset retirement obligations in the period in which they are incurred. When the liability is initially recorded, GSWC capitalizes the cost by increasing the carrying amount of the related long-lived asset. Over time, the liability is accreted to its present value each period, and the capitalized cost is depreciated over the useful life of the related asset. Upon settlement of the liability, GSWC either settles the obligation for its recorded amount or incurs a gain or loss upon settlement. Retirement costs have historically been recovered through rates subsequent to the retirement costs being incurred. Accordingly, recoverability of GSWC’s asset retirement obligations are reflected as a regulatory asset. GSWC also reflects the loss or gain at settlement as a regulatory asset or liability on the balance sheet. With regards to removal costs associated with certain other long-lived assets, such as water mains, distribution and transmission assets, asset retirement obligations have not been recognized as GSWC believes that it will not be obligated to remove these assets. There are no CPUC rules or regulations that require GSWC to remove any of its other long-lived assets. In addition, GSWC’s water pipelines are not subject to regulation by any federal regulatory agency. GSWC has franchise agreements with various municipalities in order to use the public right of way for utility purposes (i.e., operate water distribution and transmission assets), and if certain events occur in the future, GSWC could be required to remove or relocate certain of its pipelines. However, it is not possible to estimate an asset retirement amount since the timing and the amount of assets that may be required to be removed, if any, is not known. Amounts recorded for asset retirement obligations are subject to various assumptions and determinations, such as determining whether a legal obligation exists to remove assets, estimating the fair value of the costs of removal, when final removal will occur and the credit-adjusted risk-free interest rates to be utilized on discounting future liabilities. Changes that may arise over time with regard to these assumptions will change amounts recorded in the future. Revisions in estimates for timing or estimated cash flows are recognized as changes in the carrying amount of the liability and the related capitalized asset. The estimated fair value of the costs of removal was based on third-party costs. |
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| Impairment of Long-Lived Assets: | Impairment of Long-Lived Assets: Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be fully recoverable in accordance with accounting guidance for impairment or disposal of long-lived assets. Registrant would recognize an impairment loss on its regulated assets only if the carrying value amount of a long-lived asset is not recoverable from customer rates authorized by the CPUC. Impairment loss is measured as the excess of the carrying value over the amounts recovered in customer rates. For the years ended December 31, 2017, 2016 and 2015, no impairment loss was incurred. |
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| Goodwill: | Goodwill: At December 31, 2017 and 2016, AWR had approximately $1.1 million of goodwill. The $1.1 million goodwill arose from ASUS’s acquisition of a subcontractor’s business at some of the Military Utility Privatization Subsidiaries. In accordance with the accounting guidance for testing goodwill, AWR annually assesses qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. For 2017, AWR’s assessment of qualitative factors did not indicate that an impairment had occurred for goodwill at ASUS. |
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| Cash and Cash Equivalents: | Cash and Cash Equivalents: Cash and cash equivalents include short-term cash investments with an original maturity of three months or less. At times, cash and cash equivalent balances may be in excess of federally insured limits. Cash and cash equivalents are held with financial institutions with high credit standings. |
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| Accounts Receivable: | Accounts Receivable: Accounts receivable is reported on the balance sheet net of any allowance for doubtful accounts. The allowance for doubtful accounts is Registrant’s best estimate of the amount of probable credit losses in Registrant’s existing accounts receivable from its water and electric customers, and is determined based on historical write-off experience and the aging of account balances. Registrant reviews the allowance for doubtful accounts quarterly. Account balances are written off against the allowance when it is probable the receivable will not be recovered. When utility customers request extended payment terms, credit is extended based on regulatory guidelines, and collateral is not required. Receivables from the U.S. government include amounts due under contracts with the U.S. government to operate and maintain, and/or provide construction services for the water and/or wastewater systems at military bases. Other accounts receivable consist primarily of amounts due from third parties (non-utility customers) for various reasons, including amounts due from contractors, amounts due under settlement agreements, amounts due from other third-party prime government contractors pursuant to agreements for construction of water and/or wastewater facilities for such third-party prime contractors. The allowance for these other accounts receivable is based on Registrant’s evaluation of the receivable portfolio under current conditions and a review of specific problems and such other factors that, in Registrant’s judgment, should be considered in estimating losses. Allowances for doubtful accounts are disclosed in Note 16. |
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| Materials and Supplies: | Materials and Supplies: Materials and supplies are stated at the lower of cost or net realizable value. Cost is computed using average cost. Major classes of materials include pipe, hydrants and valves. |
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| Interest: | Interest: Interest incurred during the construction of capital assets has generally not been capitalized for financial reporting purposes as such policy is not followed in the ratemaking process. Interest expense is generally recovered through the regulatory process. However, the CPUC has authorized certain capital projects to be filed for revenue recovery with advice letters when those projects are completed. During the time that such projects are under development and construction, GSWC may accrue an allowance for funds used during construction (“AFUDC”) on the incurred expenditures to offset the cost of financing project construction. For the year ended December 31, 2017, no AFUDC was recorded. For the years ended December 31, 2016 and 2015, GSWC recorded $101,000 and $694,000, respectively, of AFUDC related to capital projects based on a weighted cost of capital of 8.34% for water and a cost of debt of 6.96% for electric, as approved by the CPUC. |
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| Water and Electric Operating Revenues: | Water and Electric Operating Revenues: GSWC records water and electric utility operating revenues when the service is provided to customers. Revenues include amounts billed to customers on a cycle basis based on meter readings for services provided and unbilled revenues representing estimated amounts to be billed for usage from the last meter reading date to the end of the accounting period. Unbilled revenues are based on historical customer usage to estimate unbilled usage. |
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| Alternative-Revenue Program: | Alternative-Revenue Programs: As authorized by the CPUC, GSWC records in revenues the difference between the adopted level of volumetric revenues as authorized by the CPUC for metered accounts (volumetric revenues) and the actual volumetric revenues recovered in customer rates. If this difference results in an under-collection of revenues, GSWC records the additional revenue only to the extent that they are expected to be collected within 24 months following the year in which they are recorded in accordance with the accounting guidance for alternative-revenue programs. |
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| Other Operating Revenues: | Contracted Services Revenues: Revenues from ASUS contract operations and maintenance agreements are recognized on a monthly basis when services have been rendered to the U.S. government. Revenues for construction contracts are recognized based on the percentage-of-completion and cost-plus methods of accounting. In accordance with U.S. GAAP, revenue recognition under these methods requires ASUS to estimate the progress toward completion on a contract in terms of efforts such as costs incurred. This approach is used because management considers them to be the best available measure of progress on these contracts. Revenues from cost-plus contracts of ASUS are recognized on the basis of costs incurred during the period plus the profit earned, measured by the cost-to-cost method. Unbilled receivables from the U.S. government represent amounts to be billed for construction work completed and/or for services rendered pursuant to contracts with the U.S government, which are not presently billable but which will be billed under the terms of those contracts. Construction costs for ASUS include all direct material and labor costs charged by subcontractors, direct labor of employees of the Military Utility Privatization Subsidiaries, and those indirect costs related to contract performance, such as indirect labor, supplies, and tools. The factors considered in including such costs in revenues and expenses are that ASUS and/or the Military Utility Privatization Subsidiaries: (i) are the primary obligor in these arrangements with the U.S. government and the third-party prime contractors, (ii) have latitude in establishing pricing, and (iii) bear credit risk in the collection of receivables. Administrative and general costs are charged to expense as incurred. Precontract costs for ASUS, which consist of design and engineering labor costs, are deferred if they are probable of recovery and are expensed as incurred if they are not probable of recovery. Deferred precontract costs have been immaterial to date. Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are determined. Changes in job performance, job conditions, change orders and estimated profitability, including those arising from contract penalty provisions, and final contract settlements may result in revisions to costs and income for ASUS and are recognized in the period in which the revisions are determined. The asset “Costs and estimated earnings in excess of billings on contracts” represents revenues recognized in excess of amounts billed. The liability “Billings in excess of costs and estimated earnings on contracts” represents billings in excess of revenues recognized. Amounts expected to be earned/collected in the next 12-months have been classified as current. |
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| Debt Issuance Costs and Redemption Premiums: | Debt Issuance Costs and Redemption Premiums: Original debt issuance costs are deducted from the carrying value of the associated debt liability and amortized over the lives of the respective issues. Premiums paid on the early redemption of debt, which is reacquired through refunding, are deferred and amortized over the life of the debt issued to finance the refunding as Registrant normally receives recovery of these costs in rates. |
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| Advances for Construction and Contributions in aid of Constructions: | Advances for Construction and Contributions in Aid of Construction: Advances for construction represent amounts advanced by developers for the cost to construct water system facilities in order to extend water service to their properties. Advances are generally refundable in equal annual installments, generally over 40 years. In certain instances, GSWC makes refunds on these advances over a specific period of time based on operating revenues related to the main or as new customers are connected to receive service from the main. Contributions in aid of construction are similar to advances but require no refunding. Generally, GSWC depreciates contributed property and amortizes contributions in aid of construction at the composite rate of the related property. |
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| Fair Value of Financial Instruments: | Fair Value of Financial Instruments: For cash and cash equivalents, accounts receivable, accounts payable and short-term debt, the carrying amount is assumed to approximate fair value due to the short-term nature of the amounts. The table below estimates the fair value of long-term debt issued by GSWC. Rates available to GSWC at December 31, 2017 and 2016 for debt with similar terms and remaining maturities were used to estimate fair value for long-term debt. Changes in the assumptions will produce differing results.
(1) Excludes debt issuance costs and redemption premiums. The accounting guidance for fair value measurements applies to all financial assets and financial liabilities that are being measured and reported on a fair value basis. Under the accounting guidance, GSWC makes fair value measurements that are classified and disclosed in one of the following three categories: Level 1: Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2: Quoted prices in markets that are not active, or inputs which are observable, either directly or indirectly, for substantially the full term of the asset or liability; or Level 3: Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity). Publicly issued notes, private placement notes and other long-term debt are measured using current U.S. corporate bond yields for similar debt instruments and are classified as Level 2. The following table sets forth by level, within the fair value hierarchy, GSWC’s long-term debt measured at fair value as of December 31, 2017:
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| Stock Awards | Stock-Based Awards: AWR has issued stock-based awards to its employees under stock incentive plans. AWR has also issued stock-based awards to its Board of Directors under non-employee directors stock plans. Registrant applies the provisions in the accounting guidance for share-based payments in accounting for all of its stock-based awards. See Note 12 for further discussion. |
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| Sales and Use Taxes: | Sales and Use Taxes: GSWC bills certain sales and use taxes levied by state or local governments to its customers. Included in these sales and use taxes are franchise fees, which GSWC pays to various municipalities (based on ordinances adopted by these municipalities) in order to use public rights of way for utility purposes. GSWC bills these franchise fees to its customers based on a CPUC-authorized rate for each rate-making area as applicable. These franchise fees, which are required to be paid regardless of GSWC’s ability to collect them from its customers, are accounted for on a gross basis. GSWC’s franchise fees billed to customers and recorded as operating revenue were approximately $3.6 million, $3.5 million and $3.8 million for the years ended December 31, 2017, 2016 and 2015, respectively. When GSWC acts as an agent, and the tax is not required to be remitted if it is not collected from the customer, the taxes are accounted for on a net basis. Depending on the state in which its subsidiary operations are conducted, ASUS is also subject to certain state non-income tax assessments generally computed on a “gross receipts” or “gross revenues” basis. These non-income tax assessments are required to be paid regardless of whether the subsidiary is reimbursed by the U.S. government for these assessments under its 50-year contracts, including modifications to these contracts. The non-income tax assessments are accounted for on a gross basis and totaled $287,000, $309,000 and $367,000 during the years ended December 31, 2017, 2016 and 2015, respectively. |
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| Recently Adopted Accounting Pronouncements: | Recently Issued Accounting Pronouncements: In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update 2016-09, Improvements to Employee Share-Based Payment Accounting, which amends Accounting Standards Codification ("ASC") Topic 718, Compensation - Stock Compensation. Under the new guidance, the tax effects related to share-based payments at settlement (or expiration) are required to be recorded through the income statement rather than through equity, therefore increasing the volatility of income tax expense. The new standard also removed the requirement to delay recognition of a windfall tax benefit until an employer reduces its current taxes payable. It also permits entities to make an accounting policy election for the impact of forfeitures on the recognition of expense for shared-based payment awards. Income tax benefits in excess of compensation costs or tax deficiencies for share-based compensation are recorded to the income tax provision, instead of to shareholders' equity, which can impact the effective tax rate. In addition, the excess tax benefits are classified as an operating activity along with other income tax cash flows on the statement of cash flows. Registrant adopted the new standard effective January 1, 2017 on a prospective basis and, therefore, all excess tax benefits resulting from share-based payments during the year ended December 31, 2017 were reflected in the income statements, which reduced income tax expense by approximately $1,042,000 and $1,011,000 for AWR and GSWC, respectively. |
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- Definition Disclosure of accounting policy for advances for construction and contributions in aid of constructions. No definition available.
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| X | ||||||||||
- Definition Disclosure of accounting policy related to transactions with related parties. No definition available.
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| X | ||||||||||
- Definition Disclosure of accounting policy relating to sales and use taxes. No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Disclosure of accounting policy for AFUDC (for example, component of PPE, credit to income statement), information regarding the inclusion in rates (only capitalized if its inclusion in rates is probable) and description of AFUDC (for example, represents the cost of capital used during construction). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Disclosure of accounting policy for legal obligation associated with retirement of long-lived asset that results from acquisition, construction, or development or from normal operation of long-lived asset. Excludes environmental remediation liability from improper or other-than-normal operation of long-lived asset, obligation arising in connection with leased property that meets definition of lease payments or variable lease payments and from plan to sell or otherwise dispose of a long-lived asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). No definition available.
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| X | ||||||||||
- Definition Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Disclosure of accounting policy for construction contractors. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Disclosure of accounting policy related to debt. Includes, but is not limited to, debt issuance costs, the effects of refinancings, method of amortizing debt issuance costs and original issue discount, and classifications of debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Disclosure of accounting policy for determining the fair value of financial instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Disclosure of accounting policy for goodwill. This accounting policy also may address how an entity assesses and measures impairment of goodwill, how reporting units are determined, how goodwill is allocated to such units, and how the fair values of the reporting units are determined. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Disclosure of accounting policy for recognizing and measuring the impairment of long-lived assets. An entity also may disclose its accounting policy for long-lived assets to be sold. This policy excludes goodwill and intangible assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Disclosure of inventory accounting policy for inventory classes, including, but not limited to, basis for determining inventory amounts, methods by which amounts are added and removed from inventory classes, loss recognition on impairment of inventories, and situations in which inventories are stated above cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact. No definition available.
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| X | ||||||||||
- Definition Disclosure of accounting policy for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, basis of assets, depreciation and depletion methods used, including composite deprecation, estimated useful lives, capitalization policy, accounting treatment for costs incurred for repairs and maintenance, capitalized interest and the method it is calculated, disposals and impairments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Disclosure of accounting policy for public utilities. Examples include a discussion about the scope criteria and appropriateness for and extent of the application of generally accepted accounting principles related to accounting for the effects of certain types of regulation (may include identification of specific business units). Other examples of the disclosures may include: descriptions of the form and economic effects of regulation (for example, but not limited to, recording of regulatory assets and liabilities to the rate setting process); statement about periodic assessments of periodic assessments of generally accepted accounting principles related to accounting for the effects of certain types of regulation; information regarding amortization of and return on regulatory assets and liabilities, including the remaining amounts and recovery or settlement periods; accounting for changes to recovery estimates; AFUDC, plant abandonment's and plant disallowances. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Disclosure of accounting policy for revenue recognition related to alternative revenue programs. The major alternative revenue programs can generally be segregated into two categories, programs that adjust billings for the effects of weather abnormalities or broad external factors or to compensate the utility for demand-side management initiatives (for example, no-growth plans and similar conservation efforts); and programs that provide for additional billings (incentive awards) if the utility achieves certain objectives, such as reducing costs, reaching specified milestones, or demonstratively improving customer service. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Disclosure of accounting policy for stock option and stock incentive plans. This disclosure may include (1) the types of stock option or incentive plans sponsored by the entity (2) the groups that participate in (or are covered by) each plan (3) significant plan provisions and (4) how stock compensation is measured, and the methodologies and significant assumptions used to determine that measurement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Disclosure of accounting policy for trade and other accounts receivables. This disclosure may include the basis at which such receivables are carried in the entity's statements of financial position (for example, net realizable value), how the entity determines the level of its allowance for doubtful accounts, when impairments, charge-offs or recoveries are recognized, and the entity's income recognition policies for such receivables, including its treatment of related fees and costs, its treatment of premiums, discounts or unearned income, when accrual of interest is discontinued, how the entity records payments received on nonaccrual receivables and its policy for resuming accrual of interest on such receivables. If the enterprise holds a large number of similar loans, disclosure may include the accounting policy for the anticipation of prepayments and significant assumptions underlying prepayment estimates for amortization of premiums, discounts, and nonrefundable fees and costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT Related Party (Policies) |
12 Months Ended |
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Dec. 31, 2017 | |
| Related Party Transactions [Abstract] | |
| Related Party Transactions Disclosure [Text Block] | Related-Party Transactions: As further discussed in Note 2 — Notes Payable to Banks, AWR (parent) has access to a $150.0 million syndicated credit facility. AWR (parent) borrows under this facility and provides funds to its subsidiaries, in support of their operations. Any amounts owed to AWR (parent) for borrowings under this facility are reflected as inter-company receivables on the condensed balance sheets. The interest rate charged to the subsidiaries is sufficient to cover AWR (parent)’s interest cost under the credit facility. In October 2015, AWR issued interest bearing promissory notes (the "Notes") to GSWC and ASUS for $40 million and $10 million, respectively, which expire on May 23, 2018. Under the terms of the Notes, AWR may borrow from GSWC and ASUS amounts up to $40 million and $10 million, respectively, for working capital purposes. AWR agrees to pay any unpaid principal amounts outstanding under these notes, plus accrued interest. As of December 31, 2017 and 2016, there were no amounts outstanding under these notes. AWR (parent) guarantees performance of ASUS's military privatization contracts and agrees to provide necessary resources, including financing, which are necessary to assure the complete and satisfactory performance of such contracts. |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Summary of Significant Accounting Policies (Tables) - GSWC |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2017 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of significant accounting policies | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of estimated useful lives of utility plant, as authorized by the CPUC | Estimated useful lives of GSWC’s utility plant, as authorized by the CPUC, are as follows:
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| Schedule of estimates of the fair value of long-term debt | The table below estimates the fair value of long-term debt issued by GSWC. Rates available to GSWC at December 31, 2017 and 2016 for debt with similar terms and remaining maturities were used to estimate fair value for long-term debt. Changes in the assumptions will produce differing results.
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| Schedule of long-term debt measured at fair value | The following table sets forth by level, within the fair value hierarchy, GSWC’s long-term debt measured at fair value as of December 31, 2017:
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| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
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| X | ||||||||||
- Definition Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. No definition available.
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| X | ||||||||||
- Definition Tabular disclosure of public utility physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, deprecation expense and method used, including composite depreciation, and accumulated deprecation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Details
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Regulatory Matters (Tables) |
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| Regulated Operations [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of regulatory assets, less regulatory liabilities in the consolidated balance sheets for continuing operations | Regulatory assets, less regulatory liabilities, included in the consolidated balance sheets are as follows:
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| X | ||||||||||
- Definition Tabular disclosure of regulatory assets, less regulatory liabilities, included in consolidated balance sheets for continuing operations. No definition available.
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| X | ||||||||||
- References No definition available.
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Utility Plant and Intangible Assets (Tables) |
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| Utility Plant and Intangible Assets | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Registrant's utility plant utilized in continuing operations by major asset class | The following table shows Registrant’s utility plant by major asset class:
(1) Includes intangible assets of $1.2 million for the years ended December 31, 2017 and 2016 for studies performed in association with the electricity segment of the Registrant’s operations. |
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| Schedule of components of intangible assets | As of December 31, 2017 and 2016, intangible assets consist of the following:
(2) Includes intangible assets of $571,000 for contracted services included in "Other Property and Investments" on the consolidated balance sheets as of December 31, 2017 and 2016. (3) The intangible assets not subject to amortization primarily consist of organization and consent fees. |
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| Schedule of estimated future consolidated amortization expenses related to intangible assets | Estimated future consolidated amortization expenses related to intangible assets for the succeeding five years are (in thousands):
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| Schedule of reconciliation of the beginning and ending aggregate carrying amount of the asset retirement obligations | The following is a reconciliation of the beginning and ending aggregate carrying amount of asset retirement obligations, which are included in “Other Credits” on the balance sheets as of December 31, 2017 and 2016:
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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of indefinite and finite lived intangible assets by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the entity. No definition available.
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- Definition Tabular disclosure of the components of public utility property, plant and equipment. No definition available.
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- Definition -- None. No documentation exists for this element. -- No definition available.
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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Derivative Instruments (Tables) |
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Dec. 31, 2017 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Derivative instruments | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of changes in the fair value of the derivative | The following table presents changes in the fair value of GSWC’s derivatives for the years ended December 31, 2017 and 2016:
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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Military Privatization (Tables) |
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| Military Privatization | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of costs and estimated earnings on uncompleted contracts and amounts due from the U.S. government | Costs and estimated earnings on contracts and amounts due from the U.S. government as of December 31, 2017 and 2016 are as follows:
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- Definition Tabular disclosure for costs and estimated earnings on uncompleted contracts and amounts due from the U.S. government. No definition available.
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- Definition -- None. No documentation exists for this element. -- No definition available.
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Earnings Per Share and Capital Stock (Tables) |
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| Earnings Per Share [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of reconciliation of Registrant's net income and weighted average Common Shares outstanding for calculating basic net income per share | The following is a reconciliation of Registrant’s net income and weighted average Common Shares outstanding for calculating basic net income per share:
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| Schedule of reconciliation of Registrant's net income and weighted average Common Shares outstanding for calculating diluted net income per share | The following is a reconciliation of Registrant’s net income and weighted average Common Shares outstanding for calculating diluted net income per share:
(1) In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 69,202 stock options and 205,166 restricted stock units, including performance awards, at December 31, 2017 were deemed to be outstanding in accordance with accounting guidance on earnings per share. |
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- References No definition available.
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- Definition Tabular disclosure of the effect of income (loss) on basic earnings per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Tabular disclosure of the effect of income (loss) on an entity's diluted earnings per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Bank Debt (Tables) |
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| Schedule of short-term borrowing activities (excluding letters of credit) | AWR’s short-term borrowing activities (excluding letters of credit) for the years ending December 31, 2017 and 2016 were as follows:
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- Definition -- None. No documentation exists for this element. -- No definition available.
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| X | ||||||||||
- Definition Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Long-Term Debt (Tables) |
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Dec. 31, 2017 | |||||||||||||||||||||||||||||||||||||||||
| Debt Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||
| Schedule of annual maturities of all long-term debt, including capitalized leases | Annual maturities of all long-term debt at December 31, 2017 are as follows (in thousands):
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- References No definition available.
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Taxes on Income (Tables) |
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| Income Tax Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of significant components of the deferred tax assets and liabilities from continuing operations | The significant components of the deferred tax assets and liabilities as reflected in the balance sheets at December 31, 2017 and 2016 are:
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| Schedule of current and deferred components of income tax expense from continuing operations | The current and deferred components of income tax expense are as follows:
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| Schedule of reconciliations of the effective tax rates to the federal statutory rate | The reconciliations of the effective tax rates to the federal statutory rate are as follows:
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- References No definition available.
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| X | ||||||||||
- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Employee Benefit Plans (Tables) |
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| Employee benefit plans | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Pension Plan's funded status and amounts recognized in balance sheets and the components of net pension cost and accrued post-retirement liability | The following table sets forth the Pension Plan’s and post-retirement medical plan’s funded status and amounts recognized in Registrant’s balance sheets and the components of net pension cost and accrued liability at December 31, 2017 and 2016:
* Age-graded ranging from 3.0% to 8.0%. |
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| Schedule of components of net periodic pension and post-retirement benefits cost, before allocation to the overhead pool | The components of net periodic pension and post-retirement benefits cost, before allocation to the overhead pool, for 2017, 2016 and 2015 are as follows:
*6.0% for union plan and 4.2% for non-union (net of income taxes) in 2017, and 7.00% for union plan and 4.20% for non-union (net of income taxes) for 2016 and 2015. |
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| Schedule of Actual Allocation of Plan Assets [Table Text Block] | The Committee approves the target asset allocations. Registrant’s pension and post-retirement plan weighted-average asset allocations at December 31, 2017 and 2016, by asset category are as follows:
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| Schedule of pension and post-retirement plan target asset allocations | Equity securities did not include AWR’s Common Shares as of December 31, 2017 and 2016.
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| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block] | The following tables set forth the fair value, measured by net asset value, of the pension investment assets as of December 31, 2017 and 2016:
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| Schedule of pension and post-retirement plans' investment assets measured at fair value | The following tables set forth by level, within the fair value hierarchy, the post-retirement plan's investment assets measured at fair value as of December 31, 2017 and 2016:
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| Schedule of estimated future benefit payments | stimated future benefit payments at December 31, 2017 for the next five years and thereafter are as follows (in thousands):
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| Schedule of effects of one-percentage-point change in assumed health care cost trend rates | A one-percentage-point change in assumed health care cost trend rates would have the following effects on the post-retirement medical plan:
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| Supplemental Employee Retirement Plan [Member] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Employee benefit plans | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Pension Plan's funded status and amounts recognized in balance sheets and the components of net pension cost and accrued post-retirement liability | The following provides a reconciliation of benefit obligations, funded status of the SERP, as well as a summary of significant estimates at December 31, 2017 and 2016:
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| Schedule of components of net periodic pension and post-retirement benefits cost, before allocation to the overhead pool | The components of SERP expense, before allocation to the overhead pool, for 2017, 2016 and 2015 are as follows:
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| Schedule of pension and post-retirement plans' investment assets measured at fair value | The following tables set forth by level, within the fair value hierarchy, the Rabbi Trust investment assets measured at fair value as of December 31, 2017 and 2016:
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| Schedule of estimated future benefit payments | Estimated future benefit payments for the SERP at December 31, 2017 for the next ten years are as follows (in thousands):
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| X | ||||||||||
- Definition Tabular disclosure of pension and post-retirement plan weighted-average asset allocations. No definition available.
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| X | ||||||||||
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments and assumptions used to determine for pension plans and/or other employee benefit plans net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. No definition available.
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| X | ||||||||||
- Definition Tabular disclosure of pension plan's funded status and amounts recognized in the entity's balance sheets, the components of net pension cost and accrued post-retirement liability, estimated amounts that will be amortized in next fiscal year and weighted average assumptions to calculated benefit obligations. No definition available.
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| X | ||||||||||
- Definition Tabular disclosure of pension and post-retirement plan target asset allocations. No definition available.
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Definition Tabular disclosure of investments in certain entities that calculate net asset value per share or equivalent measured at fair value on a recurring or nonrecurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Details
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Stock-Based Compensation Plans (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2017 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Actual Allocation of Plan Assets [Table Text Block] | The Committee approves the target asset allocations. Registrant’s pension and post-retirement plan weighted-average asset allocations at December 31, 2017 and 2016, by asset category are as follows:
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| Schedule of share-based compensation expenses | The following table presents share-based compensation expenses for the years ended December 31, 2017, 2016 and 2015. These expenses resulting from restricted stock units, including performance awards, are included in administrative and general expenses in AWR's and GSWC’s statements of income:
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| Schedule of assumptions used to estimate fair value of each option grant on the grant date using the Black-Scholes option-pricing model | will be earned based on Registrant’s TSR compared to the TSR for a specific peer group of investor-owned water companies. A summary of the status of Registrant’s outstanding performance awards to officers as of December 31, 2017, and changes during the year ended December 31, 2017, is presented below:
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| Summary of stock option activity | A summary of stock option activity as of December 31, 2017 and changes during the year ended December 31, 2017, are presented below:
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| Summary of the status of Registrant's outstanding restricted stock units to employees and directors | A summary of the status of Registrant’s outstanding RSUs, excluding performance awards, to employees and directors as of December 31, 2017, and changes during the year ended December 31, 2017, is presented below:
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- Definition Tabular disclosure of pension and post-retirement plan weighted-average asset allocations. No definition available.
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- References No definition available.
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| X | ||||||||||
- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding performance-based awards that are fully vested and expected to vest. Includes, but is not limited to, unvested awards for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. No definition available.
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Commitments (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||
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Dec. 31, 2017 | |||||||||||||||||||||||||||||||||||||
| Risks and Uncertainties [Abstract] | |||||||||||||||||||||||||||||||||||||
| Schedule of estimated future minimum payments under purchased water supply commitments | GSWC’s estimated future minimum payments under these purchased water supply commitments at December 31, 2017 are as follows (in thousands):
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| Schedule of future minimum payments under long-term non-cancelable operating leases | Registrant’s future minimum payments under long-term non-cancelable operating leases at December 31, 2017 are as follows (in thousands):
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- Definition Tabular disclosure of arrangements in which the entity has agreed to procure goods or services from one or more suppliers. May include identification of the goods or services to be purchased, identity of the seller, pricing, effects on pricing for failing to reach minimum quantities required to be purchased (such as penalties), cancellation rights, and termination provisions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Business Segments (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2017 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Segment Reporting [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of reporting segments information | Capital additions reflect capital expenditures paid in cash and exclude U.S. government-funded and third-party prime funded capital expenditures for ASUS and property installed by developers and conveyed to GSWC.
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| Schedule of reconciliation of total utility plant (a key figure for rate-making) to total consolidated assets | The following table reconciles total utility plant (a key figure for rate-making) to total consolidated assets (in thousands):
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| X | ||||||||||
- Definition Tabular disclosure of reconciliation of total utility plant (a key figure for rate-making) to total consolidated assets. No definition available.
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| X | ||||||||||
- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
|
Allowance for Doubtful Accounts (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2017 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Allowance for Doubtful Accounts | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of provision for doubtful accounts charged to expense and accounts written off, net of recoveries | The table below presents Registrant’s provision for doubtful accounts charged to expense and accounts written off, net of recoveries. Provisions included in 2017, 2016, and 2015 for AWR and GSWC are as follows:
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| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
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| X | ||||||||||
- Definition Tabular disclosure of the allowance for doubtful accounts of the entity. No definition available.
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Supplemental Cash Flow Information (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2017 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplemental Cash Flow Elements [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of non-cash financing and investing activities and other cash flow information | The following table sets forth non-cash financing and investing activities and other cash flow information (in thousands).
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| X | ||||||||||
- Definition Tabular disclosure of supplemental cash flow information for the periods presented. No definition available.
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| X | ||||||||||
- References No definition available.
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Quarterly Financial Data (Unaudited) (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2017 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Quarterly Financial Data [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Quarterly Financial Information | Registrant's business is seasonal, and it is management’s opinion that comparisons of earnings for the quarterly periods do not reflect overall trends and changes in Registrant’s operations.
* The sum of the quarterly 2017 basic earnings per share amounts do not agree to the yearly total due to rounding.
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| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
Summary of Significant Accounting Policies (Details) customer in Thousands |
1 Months Ended | 12 Months Ended | |||||
|---|---|---|---|---|---|---|---|
Sep. 29, 2017 |
Sep. 30, 2017 |
Dec. 31, 2017
USD ($)
registrant
customer
|
Dec. 31, 2016
USD ($)
|
Dec. 31, 2015
USD ($)
|
Oct. 31, 2015
USD ($)
|
Oct. 27, 2015
USD ($)
|
|
| Summary of significant accounting policies | |||||||
| Debt Issuance Costs, Net | $ 3,902,000 | $ 4,271,000 | |||||
| Related Party Transaction, Amounts of Transaction | $ 4,000,000 | 3,900,000 | $ 2,600,000 | ||||
| Basis of Presentation: | |||||||
| Number of registrants filing combined report | registrant | 2 | ||||||
| Impairment of Long-Lived Assets | |||||||
| Impairment of long-lived assets | $ 0 | 0 | 0 | ||||
| Goodwill | |||||||
| Goodwill arose from acquisition of subcontractor's business | 1,100,000 | 1,100,000 | |||||
| Sales and Use Taxes: | |||||||
| Non-income tax assessments accounted on a gross basis | $ 17,905,000 | 16,801,000 | $ 16,636,000 | ||||
| Military Utility Privatization Subsidiaries | |||||||
| Summary of significant accounting policies | |||||||
| Period of Fixed Price Contracts to Maintain Water Systems at Various Military Bases | 50 years | ||||||
| GSWC | |||||||
| Summary of significant accounting policies | |||||||
| Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | $ 1,011,000 | ||||||
| Debt Issuance Costs, Net | $ 3,902,000 | $ 4,271,000 | |||||
| Property and Depreciation | |||||||
| Aggregate composite rate for depreciation (as a percent) | 2.60% | 2.90% | 3.20% | ||||
| Depreciation on transportation equipment | $ 242,000 | $ 259,000 | $ 641,000 | ||||
| Estimated useful lives of utility plant, as authorized by the CPUC | |||||||
| Generation | 40 years | ||||||
| Interest | |||||||
| Amount recorded in AFUDC | $ 0 | 101,000 | 694,000 | ||||
| Alternative-Revenue Programs | |||||||
| Number of months within which expected additional revenue collection is recorded | 24 months | ||||||
| Advances for Construction and Contributions in aid of Constructions | |||||||
| Period for refund of advances for construction | 40 years | ||||||
| Fair Value of Financial Instruments | |||||||
| Long-term debt-GSWC | $ 424,042,000 | ||||||
| Sales and Use Taxes: | |||||||
| Franchise fees billed to customers and recorded as operating revenue | 3,600,000 | 3,500,000 | 3,800,000 | ||||
| Non-income tax assessments accounted on a gross basis | 16,402,000 | 15,444,000 | 15,244,000 | ||||
| GSWC | Level 1 | |||||||
| Fair Value of Financial Instruments | |||||||
| Long-term debt-GSWC | 0 | ||||||
| GSWC | Level 3 | |||||||
| Fair Value of Financial Instruments | |||||||
| Long-term debt-GSWC | 0 | ||||||
| GSWC | Carrying Amount | |||||||
| Fair Value of Financial Instruments | |||||||
| Long-term debt-GSWC | 325,265,000 | 325,582,000 | |||||
| GSWC | Fair Value | |||||||
| Fair Value of Financial Instruments | |||||||
| Long-term debt-GSWC | 423,124,000 | ||||||
| GSWC | Fair Value | Level 2 | |||||||
| Fair Value of Financial Instruments | |||||||
| Long-term debt-GSWC | $ 424,042,000 | ||||||
| GSWC | Minimum [Member] | |||||||
| Estimated useful lives of utility plant, as authorized by the CPUC | |||||||
| Source of water supply | 30 years | ||||||
| Pumping | 25 years | ||||||
| Water treatment | 20 years | ||||||
| Transmission and distribution | 25 years | ||||||
| Other plant | 7 years | ||||||
| GSWC | Maximum | |||||||
| Estimated useful lives of utility plant, as authorized by the CPUC | |||||||
| Source of water supply | 50 years | ||||||
| Pumping | 40 years | ||||||
| Water treatment | 35 years | ||||||
| Transmission and distribution | 55 years | ||||||
| Other plant | 40 years | ||||||
| GSWC | Notes Payable, Other Payables [Member] | |||||||
| Related Party Transactions | |||||||
| Debt Instrument, Face Amount | $ 40,000,000 | $ 40,000,000 | |||||
| Debt Instrument, Maximum Borrowing Capacity | 40,000,000 | 40,000,000 | |||||
| GSWC | Notes Payable, Other Payables [Member] | Notes Receivable | |||||||
| Related Party Transactions | |||||||
| Notes Receivable, Related Parties, Current | $ 0 | 0 | |||||
| GSWC | Purchase, production, distribution and sale of water | |||||||
| Nature of Operations: | |||||||
| Number of customers served | customer | 259 | ||||||
| Interest | |||||||
| Weighted cost of capital (as a percent) | 8.34% | ||||||
| GSWC | Electric | |||||||
| Nature of Operations: | |||||||
| Number of customers served | customer | 24 | ||||||
| Sales and Use Taxes: | |||||||
| Cost Of Debt Percent | 6.96% | ||||||
| American States Utility Services [Member] | |||||||
| Sales and Use Taxes: | |||||||
| Non-income tax assessments accounted on a gross basis | $ 287,000 | $ 309,000 | $ 367,000 | ||||
| American States Utility Services [Member] | Notes Payable, Other Payables [Member] | |||||||
| Related Party Transactions | |||||||
| Debt Instrument, Face Amount | 10,000,000 | 10,000,000 | |||||
| Debt Instrument, Maximum Borrowing Capacity | $ 10,000,000 | $ 10,000,000 | |||||
| American States Utility Services [Member] | Military Utility Privatization Subsidiaries | |||||||
| Nature of Operations: | |||||||
| Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases | 50 years | 50 years | |||||
| Fort Riley [Member] | Minimum [Member] | |||||||
| Nature of Operations: | |||||||
| Period of Transition to Operate and Maintain Water Systems at New Military Base | 6 months | 6 months | |||||
| Fort Riley [Member] | Maximum | |||||||
| Nature of Operations: | |||||||
| Period of Transition to Operate and Maintain Water Systems at New Military Base | 12 months | 12 months | |||||
| Consolidated Entities [Member] | |||||||
| Summary of significant accounting policies | |||||||
| Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | $ 1,042,000 | ||||||
| Sales [Member] | GSWC | Purchase, production, distribution and sale of water | |||||||
| Nature of Operations: | |||||||
| Percentage of total revenues | 90.00% | 90.00% | 90.00% | ||||
| Syndicated revolving credit facility | Syndicated revolving credit facility | |||||||
| Related Party Transactions | |||||||
| Maximum borrowing capacity on line of credit | $ 150,000,000 | ||||||
| AWR | |||||||
| Related Party Transactions | |||||||
| Maximum borrowing capacity on line of credit | 150,000,000 | ||||||
| AWR | Syndicated revolving credit facility | Syndicated revolving credit facility | |||||||
| Related Party Transactions | |||||||
| Maximum borrowing capacity on line of credit | $ 150,000,000 | ||||||
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition Represents information pertaining to alternative revenue programs. No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition Cost Of Debt Percent No definition available.
|
| X | ||||||||||
- Definition Debt Instrument, Maximum Borrowing Capacity No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition The aggregate amount of goodwill acquired in the prior period. No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition Represents the number of customers who are served by the entity. No definition available.
|
| X | ||||||||||
- Definition Represents the number of registrants filing combined report during the period. No definition available.
|
| X | ||||||||||
- Definition Represents the period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases. No definition available.
|
| X | ||||||||||
- Definition Represents the period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases. No definition available.
|
| X | ||||||||||
- Definition Represents the period for the refund of advances for construction. No definition available.
|
| X | ||||||||||
- Definition Represents the number of months within which expected additional revenue collection is recorded when the difference between volumetric revenues as authorized by the CPUC for metered accounts (volumetric revenues) and the actual volumetric revenues recovered in customer rates results in an undercollection of revenues. No definition available.
|
| X | ||||||||||
- Definition Period of Transition to Operate and Maintain Water Systems at New Military Base No definition available.
|
| X | ||||||||||
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of transportation equipment over the assets' useful lives. No definition available.
|
| X | ||||||||||
- Definition Represents the estimated useful life of property, plant and equipment (PPE) related to pumping owned by public utility. No definition available.
|
| X | ||||||||||
- Definition Represents the estimated useful life of property, plant and equipment (PPE) related to source of water supply owned by public utility. No definition available.
|
| X | ||||||||||
- Definition Represents the estimated useful life of property, plant and equipment (PPE) related to water treatment owned by public utility. No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition Represents the weighted cost of capital (return on rate base), with an updated embedded debt cost and the settlement ROE. No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Cost associated with reimbursable income. This occurs when a services entity incurs expenses on behalf of the client and passes through the cost of reimbursable expenses to a client. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Face (par) amount of debt instrument at time of issuance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. No definition available.
|
| X | ||||||||||
- Definition Amounts due from parties associated with the reporting entity as evidenced by a written promise to pay, due within 1 year (or 1 business cycle). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount capitalized of allowance for funds used during construction. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Composite depreciation rate for public utility plants in service. No definition available.
|
| X | ||||||||||
- Definition Useful life of utility generation assets owned by public utility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Useful life of other property, plant and equipment (PPE) owned by public utility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
|
| X | ||||||||||
- Definition Useful life of utility transmission and distribution equipment owned by public utility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
|
| X | ||||||||||
- Definition Amount of transactions with related party during the financial reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Regulatory Matters (Details) - USD ($) $ in Thousands |
1 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|
Sep. 30, 2017 |
Oct. 31, 2005 |
Jul. 31, 2005 |
Dec. 31, 2017 |
Dec. 31, 2015 |
Dec. 31, 2016 |
|
| Regulatory matters: | ||||||
| Litigation Settlement, Amount Awarded to Other Party | $ 2,600 | |||||
| Regulatory Asset Not Accruing Carrying Costs | $ 59,100 | |||||
| Pension Costs and Other Postretirement Benefit Costs | ||||||
| Regulatory matters: | ||||||
| Regulatory Asset Not Accruing Carrying Costs | 34,700 | |||||
| General Rate Case Memorandum Accounts [Member] | ||||||
| Regulatory matters: | ||||||
| Total | 9,500 | |||||
| GSWC | ||||||
| Regulatory matters: | ||||||
| Total | 2,042 | $ 146,281 | ||||
| GSWC | Various refunds to customers | ||||||
| Regulatory matters: | ||||||
| Total | $ (4,552) | (5,866) | ||||
| GSWC | WRAM, net of MCBA | ||||||
| Regulatory matters: | ||||||
| Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues | 18 months | |||||
| Total | $ 29,556 | 47,340 | ||||
| GSWC | Costs deferred for future recovery on Aerojet case | ||||||
| Regulatory matters: | ||||||
| Total | 10,656 | 11,820 | ||||
| Regulatory Asset Recovery Periods | 20 years | |||||
| GSWC | Pension Costs and Other Postretirement Benefit Costs | ||||||
| Regulatory matters: | ||||||
| Total | 33,019 | 28,118 | ||||
| GSWC | Gain (Loss) on Derivative Instruments [Member] | ||||||
| Regulatory matters: | ||||||
| Total | 2,941 | 4,901 | ||||
| GSWC | Flow-through taxes, net | ||||||
| Regulatory matters: | ||||||
| Total | (17,716) | 20,134 | ||||
| GSWC | Deferred Income Tax Charge [Member] | ||||||
| Regulatory matters: | ||||||
| Total | (83,231) | 0 | ||||
| GSWC | Low income rate assistance balancing accounts | ||||||
| Regulatory matters: | ||||||
| Total | 5,972 | 8,272 | ||||
| GSWC | Other regulatory assets, net | ||||||
| Regulatory matters: | ||||||
| Total | 14,875 | 17,633 | ||||
| GSWC | General Rate Case Memorandum Accounts [Member] | ||||||
| Regulatory matters: | ||||||
| Total | $ 10,522 | $ 13,929 | ||||
| Minimum [Member] | GSWC | ||||||
| Regulatory matters: | ||||||
| Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues | 19 months | |||||
| Minimum [Member] | GSWC | WRAM, net of MCBA | ||||||
| Regulatory matters: | ||||||
| Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues | 12 months | |||||
| Minimum [Member] | GSWC | General Rate Case Memorandum Accounts [Member] | ||||||
| Regulatory matters: | ||||||
| Regulatory Asset Recovery Periods | 12 months | |||||
| Maximum | GSWC | WRAM, net of MCBA | ||||||
| Regulatory matters: | ||||||
| Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues | 24 months | |||||
| Alternative Revenue Program | 24 months | 24 months | ||||
| Maximum | GSWC | Costs deferred for future recovery on Aerojet case | ||||||
| Regulatory matters: | ||||||
| Regulatory Asset Recovery Periods | 20 years | |||||
| Maximum | GSWC | General Rate Case Memorandum Accounts [Member] | ||||||
| Regulatory matters: | ||||||
| Regulatory Asset Recovery Periods | 36 months | |||||
| X | ||||||||||
- Definition Represents the period of time required for collection of alternative revenue following the year in which the revenue was recorded. No definition available.
|
| X | ||||||||||
- Definition Represents the recovery period for under-collection balances greater than 15 percent of adopted annual revenues. No definition available.
|
| X | ||||||||||
- Definition Represents the regulatory asset not accruing carrying costs as of the balance sheet date. No definition available.
|
| X | ||||||||||
- Definition Represents the recovery periods of the surcharge billed to the customers. No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition Amount awarded to other party in judgment or settlement of litigation. No definition available.
|
| X | ||||||||||
- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Regulatory Matters 2 (Details) - USD ($) $ in Thousands |
1 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|
Sep. 30, 2017 |
Oct. 31, 2005 |
Jul. 31, 2005 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Regulatory matters: | ||||||
| Regulatory Asset Not Accruing Carrying Costs | $ 59,100 | |||||
| Litigation Settlement, Amount Awarded to Other Party | $ 2,600 | |||||
| Regulated Operating Revenue, Water | 306,332 | $ 302,931 | $ 328,511 | |||
| Pension Costs and Other Postretirement Benefit Costs | ||||||
| Regulatory matters: | ||||||
| Regulatory Asset Not Accruing Carrying Costs | 34,700 | |||||
| General Rate Case Memorandum Accounts [Member] | ||||||
| Regulatory matters: | ||||||
| Under (over) collection | 9,500 | |||||
| WRAM | ||||||
| Regulatory matters: | ||||||
| Over collection | 15,400 | |||||
| GSWC | ||||||
| Regulatory matters: | ||||||
| Under (over) collection | 2,042 | 146,281 | ||||
| Regulated Operating Revenue, Water | $ 306,332 | 302,931 | $ 328,511 | |||
| GSWC | Minimum [Member] | ||||||
| Regulatory matters: | ||||||
| Recovery period for under-collection balances greater than 15% of adopted annual revenues | 19 months | |||||
| GSWC | Maximum | ||||||
| Regulatory matters: | ||||||
| Recovery period for under-collection balances that are up to 15% of adopted annual revenues | 36 months | |||||
| GSWC | Pension Costs and Other Postretirement Benefit Costs | ||||||
| Regulatory matters: | ||||||
| Under (over) collection | $ 33,019 | 28,118 | ||||
| GSWC | Costs deferred for future recovery on Aerojet case | ||||||
| Regulatory matters: | ||||||
| Under (over) collection | 10,656 | 11,820 | ||||
| Recovery period | 20 years | |||||
| Increase in Revenue Requirement, Recoverable through Surcharges | $ 21,300 | |||||
| GSWC | Costs deferred for future recovery on Aerojet case | Maximum | ||||||
| Regulatory matters: | ||||||
| Recovery period | 20 years | |||||
| GSWC | Gain (Loss) on Derivative Instruments [Member] | ||||||
| Regulatory matters: | ||||||
| Under (over) collection | 2,941 | 4,901 | ||||
| GSWC | Flow-through taxes, net | ||||||
| Regulatory matters: | ||||||
| Under (over) collection | (17,716) | 20,134 | ||||
| GSWC | General Rate Case Memorandum Accounts [Member] | ||||||
| Regulatory matters: | ||||||
| Under (over) collection | $ 10,522 | 13,929 | ||||
| GSWC | General Rate Case Memorandum Accounts [Member] | Minimum [Member] | ||||||
| Regulatory matters: | ||||||
| Recovery period | 12 months | |||||
| GSWC | General Rate Case Memorandum Accounts [Member] | Maximum | ||||||
| Regulatory matters: | ||||||
| Recovery period | 36 months | |||||
| GSWC | WRAM, net of MCBA | ||||||
| Regulatory matters: | ||||||
| Commercial paper, term | 90 days | |||||
| Amount billed to customers as surcharges | $ 33,700 | |||||
| Under (over) collection | $ 29,556 | 47,340 | ||||
| Under-collection balances as a percentage of adopted annual revenues | 15.00% | |||||
| Recovery period for under-collection balances greater than 15% of adopted annual revenues | 18 months | |||||
| GSWC | WRAM, net of MCBA | Minimum [Member] | ||||||
| Regulatory matters: | ||||||
| Recovery period for under-collection balances greater than 15% of adopted annual revenues | 12 months | |||||
| GSWC | WRAM, net of MCBA | Maximum | ||||||
| Regulatory matters: | ||||||
| Alternative Revenue Program | 24 months | 24 months | ||||
| Recovery period for under-collection balances greater than 15% of adopted annual revenues | 24 months | |||||
| GSWC | WRAM | ||||||
| Regulatory matters: | ||||||
| Under (over) collection | $ 5,600 | |||||
| Regulated Operating Revenue, Water | 510 | 910 | ||||
| Deferred Revenue | $ 1,400 | |||||
| GSWC | Modified Cost Balancing Account | ||||||
| Regulatory matters: | ||||||
| Under (over) collection | 24,000 | |||||
| Various refunds to customers | GSWC | ||||||
| Regulatory matters: | ||||||
| Under (over) collection | $ (4,552) | $ (5,866) | ||||
| X | ||||||||||
- Definition Represents the period of time required for collection of alternative revenue following the year in which the revenue was recorded. No definition available.
|
| X | ||||||||||
- Definition Represents the amount of increase in revenue requirement for difference between the allocated general office costs authorized by the CPUC November 2010 Decision and what was then in rates for allocated general office costs. No definition available.
|
| X | ||||||||||
- Definition Represents the term associated with a fixed-term security. No definition available.
|
| X | ||||||||||
- Definition Represents the recovery period for under-collection balances greater than 15 percent of adopted annual revenues. No definition available.
|
| X | ||||||||||
- Definition Represents the recovery period for under-collection balances that are up to 15 percent of adopted annual revenues. No definition available.
|
| X | ||||||||||
- Definition Represents amount billed to customers as surcharges. No definition available.
|
| X | ||||||||||
- Definition Represents the regulatory asset not accruing carrying costs as of the balance sheet date. No definition available.
|
| X | ||||||||||
- Definition Represents the recovery periods of the surcharge billed to the customers. No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition Represents the under-collection balances as a percentage of adopted annual revenues. No definition available.
|
| X | ||||||||||
- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount awarded to other party in judgment or settlement of litigation. No definition available.
|
| X | ||||||||||
- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The amount of regulated water operating revenues recognized during the period. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Regulatory Matters 3 (Details) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Regulatory matters: | ||
| Other Liabilities, Current | $ 15,109 | $ 11,297 |
| GSWC | ||
| Regulatory matters: | ||
| Under (over) collection | 2,042 | 146,281 |
| Other Liabilities, Current | 14,705 | 10,925 |
| Other Regulatory Assets Net [Member] | GSWC | ||
| Regulatory matters: | ||
| Under (over) collection | 14,875 | 17,633 |
| Low income rate assistance balancing accounts | GSWC | ||
| Regulatory matters: | ||
| Under (over) collection | 5,972 | 8,272 |
| Pension Costs and Other Postretirement Benefit Costs | GSWC | ||
| Regulatory matters: | ||
| Regulatory asset authorized under settlement | 34,700 | |
| Under (over) collection | 33,019 | $ 28,118 |
| Two-way pension balancing account | Pension Costs and Other Postretirement Benefit Costs | GSWC | ||
| Regulatory matters: | ||
| Regulatory asset authorized under settlement | 1,700 | |
| Two-way pension balancing account | Purchase, production, distribution and sale of water | Pension Costs and Other Postretirement Benefit Costs | GSWC | ||
| Regulatory matters: | ||
| Regulatory asset authorized under settlement | (588) | |
| Two-way pension balancing account | Electric | Pension Costs and Other Postretirement Benefit Costs | GSWC | ||
| Regulatory matters: | ||
| Regulatory asset authorized under settlement | $ (1,060) |
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Regulatory Matters 4 (Details) - GSWC - USD ($) $ in Millions |
1 Months Ended | 12 Months Ended | |
|---|---|---|---|
Oct. 31, 2005 |
Jul. 31, 2005 |
Dec. 31, 2017 |
|
| Costs deferred for future recovery on Aerojet case | |||
| Regulatory matters: | |||
| Increase in Revenue Requirement, Recoverable through Surcharges | $ 21.3 | ||
| Recovery period | 20 years | ||
| Reimbursement to recover costs | $ 17.5 | ||
| Costs deferred for future recovery on Aerojet case | Maximum | |||
| Regulatory matters: | |||
| Recovery period | 20 years | ||
| Water Revenue Adjustment Mechanism Net of Modified Cost Balancing Account [Member] | |||
| Regulatory matters: | |||
| Amount billed to customers as surcharges | $ 33.7 | ||
| X | ||||||||||
- Definition Represents the amount of increase in revenue requirement for difference between the allocated general office costs authorized by the CPUC November 2010 Decision and what was then in rates for allocated general office costs. No definition available.
|
| X | ||||||||||
- Definition Represents amount billed to customers as surcharges. No definition available.
|
| X | ||||||||||
- Definition Represents the recovery periods of the surcharge billed to the customers. No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Regulatory Matters 5 (Details) - GSWC - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Regulatory matters: | ||
| Total | $ 2,042 | $ 146,281 |
| Pension Costs and Other Postretirement Benefit Costs | ||
| Regulatory matters: | ||
| Regulatory asset | 34,700 | |
| Total | 33,019 | 28,118 |
| Pension Costs and Other Postretirement Benefit Costs | Two-way pension balancing account | ||
| Regulatory matters: | ||
| Regulatory asset | $ 1,700 | |
| Water Revenue Adjustment Mechanism Net of Modified Cost Balancing Account [Member] | ||
| Regulatory matters: | ||
| Commercial paper, term | 90 days | |
| Total | $ 29,556 | 47,340 |
| Low income rate assistance balancing accounts | ||
| Regulatory matters: | ||
| Commercial paper, term | 90 days | |
| Discount percentage for qualified low-income water customers | 15.00% | |
| Discount percentage for qualified low-income electric customers | 20.00% | |
| Total | $ 5,972 | $ 8,272 |
| X | ||||||||||
- Definition Represents the discount percentage for qualified low-income electric customers. No definition available.
|
| X | ||||||||||
- Definition Represents the discount percentage for qualified low-income water customers. No definition available.
|
| X | ||||||||||
- Definition Represents the term associated with a fixed-term security. No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Regulatory Matters 6 (Details) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| GSWC | ||
| Regulatory matters: | ||
| Net regulatory assets | $ 2,042 | $ 146,281 |
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
Regulatory Matters 9 (Details) - GSWC renewable_energy in Thousands, $ in Thousands |
1 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2012
renewable_energy
|
Dec. 31, 2017
USD ($)
|
Dec. 31, 2016
USD ($)
|
|
| Regulatory matters: | |||
| Net regulatory assets | $ | $ 2,042 | $ 146,281 | |
| Renewables Portfolio Standard | |||
| Regulatory matters: | |||
| Agreement period to purchase renewable energy credits | 10 years | ||
| Number of renewable energy credits that would be purchased | renewable_energy | 582 |
| X | ||||||||||
- Definition Represents the period of agreement with a third party to purchase renewable energy credits. No definition available.
|
| X | ||||||||||
- Definition Represents the number of renewable energy credits that would be purchased over a contractual period of time. No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Utility Plant and Intangible Assets (Details) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|---|
| Utility plant utilized in continuing operations by major asset class | |||
| Total amortized intangible assets | $ 31,192 | $ 37,678 | |
| Total utility plant, at cost | 1,674,527 | 1,620,325 | |
| Less - accumulated depreciation | (533,370) | (532,753) | |
| Construction work in progress | (63,835) | (63,354) | |
| Net utility plant | 1,204,992 | 1,150,926 | $ 1,060,794 |
| American States Utility Services [Member] | Intangible Assets [Member] | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 571 | 571 | |
| Water | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 1,574,801 | 1,526,316 | |
| Water | Land | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 14,895 | 15,393 | |
| Water | Intangible Assets [Member] | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 29,396 | 36,291 | |
| Water | Source of water supply | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 88,168 | 86,775 | |
| Water | Pumping | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 178,252 | 169,983 | |
| Water | Water treatment | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 78,999 | 74,980 | |
| Water | Transmission and distribution | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 1,064,271 | 1,014,925 | |
| Water | General | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 120,820 | 127,969 | |
| Electric | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 99,726 | 94,009 | |
| Electric | Intangible Assets [Member] | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 1,200 | 1,200 | |
| Electric | Transmission and distribution | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 76,188 | 71,112 | |
| Electric | Generation | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 12,583 | 12,583 | |
| Electric | General | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 10,955 | 10,314 | |
| GSWC | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total amortized intangible assets | 30,621 | 37,107 | |
| Total utility plant, at cost | 1,658,935 | 1,608,428 | |
| Less - accumulated depreciation | (524,481) | (524,927) | |
| Construction work in progress | (63,486) | (61,810) | |
| Net utility plant | 1,197,940 | 1,145,311 | |
| GSWC | Water | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 1,559,209 | 1,514,419 | |
| Net utility plant | 1,137,995 | 1,089,031 | 1,005,114 |
| GSWC | Water | Land | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 14,895 | 15,393 | |
| GSWC | Water | Intangible Assets [Member] | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 29,378 | 36,273 | |
| GSWC | Water | Source of water supply | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 88,168 | 86,775 | |
| GSWC | Water | Pumping | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 178,252 | 169,983 | |
| GSWC | Water | Water treatment | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 78,999 | 74,980 | |
| GSWC | Water | Transmission and distribution | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 1,064,271 | 1,014,925 | |
| GSWC | Water | General | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 105,246 | 116,090 | |
| GSWC | Electric | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 99,726 | 94,009 | |
| Net utility plant | 59,945 | 56,280 | $ 51,002 |
| GSWC | Electric | Transmission and distribution | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 76,188 | 71,112 | |
| GSWC | Electric | Generation | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 12,583 | 12,583 | |
| GSWC | Electric | General | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total utility plant, at cost | 10,955 | 10,314 | |
| Conservation [Member] | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total amortized intangible assets | 9,486 | 9,496 | |
| Conservation [Member] | GSWC | |||
| Utility plant utilized in continuing operations by major asset class | |||
| Total amortized intangible assets | $ 9,486 | $ 9,496 |
| X | ||||||||||
- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Period end book value of accumulated depreciation on property, plant and equipment (PPE) that is owned by the regulated operations of the public utility. No definition available.
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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Utility Plant and Intangible Assets 2 (Details) - USD ($) $ in Thousands |
12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
||||||
| Intangible assets | ||||||||
| Property, Plant and Equipment, Gross | $ 1,674,527 | $ 1,620,325 | ||||||
| Total amortized intangible assets | 31,192 | 37,678 | ||||||
| Less - accumulated amortization | (23,331) | (28,108) | ||||||
| Intangible assets, net of amortization | 7,861 | 9,570 | ||||||
| Unamortized intangible assets | [1] | 422 | 427 | |||||
| Amortization of intangible assets | 1,500 | 1,900 | $ 1,800 | |||||
| Estimated future consolidated amortization expenses related to intangible assets | ||||||||
| 2014 | 1,325 | |||||||
| 2015 | 1,131 | |||||||
| 2016 | 1,003 | |||||||
| 2017 | 949 | |||||||
| 2018 | 949 | |||||||
| Total | $ 5,357 | |||||||
| Conservation [Member] | ||||||||
| Intangible assets | ||||||||
| Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 3 years | |||||||
| Total amortized intangible assets | $ 9,486 | 9,496 | ||||||
| Water and water service rights | ||||||||
| Intangible assets | ||||||||
| Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 30 years | |||||||
| Total amortized intangible assets | [2] | $ 8,695 | 8,695 | |||||
| Water planning studies | ||||||||
| Intangible assets | ||||||||
| Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 14 years | |||||||
| Total amortized intangible assets | $ 13,011 | 19,487 | ||||||
| GSWC | ||||||||
| Intangible assets | ||||||||
| Property, Plant and Equipment, Gross | 1,658,935 | 1,608,428 | ||||||
| Total amortized intangible assets | 30,621 | 37,107 | ||||||
| Less - accumulated amortization | (23,221) | (28,001) | ||||||
| Intangible assets, net of amortization | 7,400 | 9,106 | ||||||
| Unamortized intangible assets | [1] | $ 404 | 409 | |||||
| GSWC | Conservation [Member] | ||||||||
| Intangible assets | ||||||||
| Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 3 years | |||||||
| Total amortized intangible assets | $ 9,486 | 9,496 | ||||||
| GSWC | Water and water service rights | ||||||||
| Intangible assets | ||||||||
| Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 30 years | |||||||
| Total amortized intangible assets | [2] | $ 8,124 | 8,124 | |||||
| GSWC | Water planning studies | ||||||||
| Intangible assets | ||||||||
| Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 14 years | |||||||
| Total amortized intangible assets | $ 13,011 | 19,487 | ||||||
| Intangible Assets [Member] | American States Utility Services [Member] | ||||||||
| Intangible assets | ||||||||
| Property, Plant and Equipment, Gross | $ 571 | $ 571 | ||||||
| ||||||||
| X | ||||||||||
- Definition Represents the amount of amortization expense expected to be recorded in the succeeding five fiscal years for finite-lived intangible assets. No definition available.
|
| X | ||||||||||
- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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Utility Plant and Intangible Assets 3 (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Reconciliation of the beginning and ending aggregate carrying amount of the asset retirement obligations | ||
| Obligation at the beginning of the period | $ 4,393 | $ 4,157 |
| Additional liabilities incurred | 562 | 121 |
| Liabilities settled | (229) | (112) |
| Accretion | 237 | 227 |
| Obligation at the end of the period | $ 4,963 | $ 4,393 |
| X | ||||||||||
- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of asset retirement obligations incurred during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
Derivative Instruments (Details) MWh in Thousands, $ in Thousands |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2017
USD ($)
MWh
quote
|
Dec. 31, 2016
USD ($)
|
|
| Purchase power contract | ||
| Derivative instruments | ||
| Number of broker quotes received to determine fair value of derivative instrument | quote | 1 | |
| GSWC | ||
| Derivative instruments | ||
| Derivative Activity Volume | MWh | 201 | |
| GSWC | Purchase power contract | ||
| Changes in the fair value of the derivative | ||
| Balance, at beginning of the period | $ (4,901) | $ (7,053) |
| Unrealized gain on purchased power contracts | 1,960 | 2,152 |
| Balance, at end of the period | $ (2,941) | $ (4,901) |
| Minimum [Member] | GSWC | Purchase power contract | ||
| Derivative instruments | ||
| Derivative, Term of Contract | 3 years | |
| Maximum | GSWC | Purchase power contract | ||
| Derivative instruments | ||
| Derivative, Term of Contract | 5 years | |
| X | ||||||||||
- Definition Derivative Activity Volume No definition available.
|
| X | ||||||||||
- Definition Number of Broker Quotes Received to Determine Fair Value of Derivative Instrument No definition available.
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
|
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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Military Privatization (Details) - USD ($) $ in Thousands |
1 Months Ended | 3 Months Ended | 12 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 29, 2017 |
Sep. 30, 2017 |
Dec. 31, 2016 |
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Military Privatization | |||||||||||||||
| Billings in excess of costs and estimated earnings on contracts | $ 2,263 | $ 3,911 | $ 2,263 | $ 3,911 | $ 2,263 | ||||||||||
| Receivables from the U.S. government: | |||||||||||||||
| Less: allowance for doubtful accounts | (764) | (1,041) | (764) | (1,041) | (764) | $ (944) | $ (892) | ||||||||
| Pretax income | |||||||||||||||
| Increase in pretax operating income | 21,955 | $ 38,567 | $ 41,816 | $ 24,738 | 22,092 | $ 39,617 | $ 31,774 | $ 21,233 | $ 127,076 | 114,716 | 118,489 | ||||
| Military Utility Privatization Subsidiaries | |||||||||||||||
| Military Privatization | |||||||||||||||
| Period of fixed price contracts to maintain water systems at various military bases | 50 years | ||||||||||||||
| Revenues recognized net of billings to date | |||||||||||||||
| Revenues (costs and estimated earnings) recognized on uncompleted contracts | 104,830 | 78,245 | 104,830 | $ 78,245 | 104,830 | ||||||||||
| Less: Billings to date | (43,161) | (15,343) | (43,161) | (15,343) | (43,161) | ||||||||||
| Total | 61,669 | 62,902 | 61,669 | 62,902 | 61,669 | ||||||||||
| Amount included in accompanying balance sheets | |||||||||||||||
| Costs and estimated earnings in excess of billings on uncompleted contracts | 63,932 | 66,813 | 63,932 | 66,813 | 63,932 | ||||||||||
| Billings in excess of costs and estimated earnings on uncompleted contracts | (2,263) | (3,911) | (2,263) | (3,911) | (2,263) | ||||||||||
| Total | 61,669 | 62,902 | 61,669 | 62,902 | 61,669 | ||||||||||
| Receivables from the U.S. government: | |||||||||||||||
| Billed receivables from the U.S. government | 8,467 | 3,725 | 8,467 | 3,725 | 8,467 | ||||||||||
| Unbilled Contract Receivables, Current | 6,691 | 7,559 | 6,691 | 7,559 | 6,691 | ||||||||||
| Pretax income | |||||||||||||||
| Government Contract Receivable | 15,158 | $ 11,284 | $ 15,158 | 11,284 | 15,158 | ||||||||||
| American States Utility Services [Member] | Military Utility Privatization Subsidiaries | |||||||||||||||
| Pretax income | |||||||||||||||
| Increase in pretax operating income | $ 21,124 | $ 18,916 | $ 18,091 | ||||||||||||
| Reportable Legal Entities [Member] | American States Utility Services [Member] | Military Utility Privatization Subsidiaries | |||||||||||||||
| Military Privatization | |||||||||||||||
| Revenue Recognition, Retrospective Rate-Setting Systems, Amount | $ 421 | $ 1,000 | |||||||||||||
| Maximum | Fort Riley [Member] | |||||||||||||||
| Military Privatization | |||||||||||||||
| Period of Transition to Operate and Maintain Water Systems at New Military Base | 12 months | 12 months | |||||||||||||
| Minimum [Member] | Fort Riley [Member] | |||||||||||||||
| Military Privatization | |||||||||||||||
| Period of Transition to Operate and Maintain Water Systems at New Military Base | 6 months | 6 months | |||||||||||||
| X | ||||||||||
- Definition Represents the period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases. No definition available.
|
| X | ||||||||||
- Definition Period of Transition to Operate and Maintain Water Systems at New Military Base No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition Revenue Recognition, Retrospective Rate-Setting Systems, Amount No definition available.
|
| X | ||||||||||
- Definition Unbilled Contract Receivables, Current No definition available.
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Definition Amount billed to customers under long-term contracts or programs but not paid. Excludes amounts due that have been withheld because of retainage provisions in a contract. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amounts due for billed services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the Company and, at a minimum, one other party. An example would be amounts billed to customers under contracts or programs but not paid as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The amount of receivables that are derived from government contracts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Unbilled amounts (net of unliquidated progress payments) of government contract receivables. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The net result for the period of deducting operating expenses from operating revenues. No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of unbilled receivables under long-term contracts that have not been billed and were not billable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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Earnings Per Share and Capital Stock (Details) - USD ($) |
3 Months Ended | 12 Months Ended | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|||
| Basic | |||||||||||||
| Net Income | $ 12,868,000 | $ 21,006,000 | $ 22,792,000 | $ 12,701,000 | $ 11,212,000 | $ 21,639,000 | $ 16,742,000 | $ 10,150,000 | $ 69,367,000 | $ 59,743,000 | $ 60,484,000 | ||
| Less: Distributed earnings to common shareholders | 36,417,000 | 33,408,000 | 32,690,000 | ||||||||||
| Less: Distributed earnings to participating securities | 197,000 | 187,000 | 207,000 | ||||||||||
| Undistributed earnings | 32,753,000 | 26,148,000 | 27,587,000 | ||||||||||
| Undistributed earnings allocated to common shareholders | 32,577,000 | 26,003,000 | 27,414,000 | ||||||||||
| Undistributed earnings allocated to participating securities | 145,000 | 173,000 | |||||||||||
| Total income available to common shareholders, basic | $ 68,994,000 | $ 59,411,000 | $ 60,104,000 | ||||||||||
| Weighted average Common Shares outstanding, basic | 36,638,000 | 36,552,000 | 37,389,000 | ||||||||||
| Basic earnings per Common Share: | |||||||||||||
| Income from continuing operations (in dollars per share) | $ 0.35 | $ 0.57 | $ 0.62 | $ 0.35 | $ 0.30 | $ 0.59 | $ 0.46 | $ 0.28 | $ 1.88 | $ 1.63 | $ 1.61 | ||
| Net Income (in dollars per share) | $ 1.88 | $ 1.63 | $ 1.61 | ||||||||||
| Diluted | |||||||||||||
| Total income available to common shareholders, basic | $ 68,994,000 | $ 59,411,000 | $ 60,104,000 | ||||||||||
| Undistributed earnings for dilutive stock options | 176,000 | 145,000 | 173,000 | ||||||||||
| Total common shareholders earnings, diluted | $ 69,170,000 | $ 59,556,000 | $ 60,277,000 | ||||||||||
| Weighted average Common Shares outstanding, basic | 36,638,000 | 36,552,000 | 37,389,000 | ||||||||||
| Stock-based compensation (in shares) | [1] | 206,000 | 198,000 | 225,000 | |||||||||
| Weighted average common shares outstanding, diluted | 36,844,000 | 36,750,000 | 37,614,000 | ||||||||||
| Diluted earnings per Common Share: | |||||||||||||
| Income from continuing operations (in dollars per share) | $ 0.35 | $ 0.57 | $ 0.62 | $ 0.34 | $ 0.30 | $ 0.59 | $ 0.45 | $ 0.28 | $ 1.88 | $ 1.62 | $ 1.60 | ||
| Net Income (in dollars per share) | $ 1.88 | $ 1.62 | $ 1.60 | ||||||||||
| Stock option and restricted stock option outstanding | |||||||||||||
| Options outstanding (in shares) | 69,202 | 69,202 | |||||||||||
| Share based compensation arrangement | |||||||||||||
| Proceeds from Stock Options Exercised, Distributed to Subsidiaries | $ 0 | $ 0 | $ 0 | ||||||||||
| Dividend Reinvestment Plan Common Stock Capital Shares Reserved for Future Issuance | 1,055,948 | 1,055,948 | |||||||||||
| Common Shares authorized for issuance but unissued under 401(k) Plan | 387,300 | 387,300 | |||||||||||
| Restricted Stock Units | |||||||||||||
| Share based compensation arrangement | |||||||||||||
| Restricted stock units outstanding (in shares) | 205,166 | 205,166 | |||||||||||
| |||||||||||||
| X | ||||||||||
- Definition Represents the number of common shares authorized but unissued under the defined contribution plan. No definition available.
|
| X | ||||||||||
- Definition Represents the number of common shares authorized but unissued under the Dividend Reinvestment Plan. No definition available.
|
| X | ||||||||||
- Definition Proceeds from Stock Options Exercised, Distributed to Subsidiaries No definition available.
|
| X | ||||||||||
- Definition Represents the earnings allocated (not distributed) to common stock under the two-class method to the extent that common shareholders may share in earnings as if all of the earnings for the period had been distributed. No definition available.
|
| X | ||||||||||
- Definition The aggregate cash, stock, and paid-in-kind dividends declared for common shareholders during the period calculated on a weighted average basis. No definition available.
|
| X | ||||||||||
- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The aggregate value of preferred stock dividends and other adjustments necessary to derive net income apportioned to common stockholders. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of undistributed earnings (loss) allocated to participating securities for the diluted earnings (loss) per share or per unit calculation under the two-class method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
Earnings Per Share and Capital Stock 2 (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Capital stock | |||
| Undistributed Earnings (Loss) Allocated to Participating Securities, Basic | $ (145,000) | $ (173,000) | |
| Additional disclosure | |||
| Common Shares issued under DRP and the 2000 and 2008 Employee Plans | 56,498 | 56,900 | 53,612 |
| Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans | $ 1,198,000 | ||
| Dividend Reinvestment Plan Common Stock Capital Shares Reserved for Future Issuance | 1,055,948 | ||
| Common Shares authorized for issuance but unissued under 401(k) Plan | 387,300 | ||
| Common Shares issued as a result of the exercise of stock options | 52,936 | 12,546 | 66,458 |
| Proceeds from Stock Options Exercised, Distributed to Subsidiaries | $ 0 | $ 0 | $ 0 |
| GSWC | |||
| Additional disclosure | |||
| Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans | 501,000 | ||
| Common Stock [Member] | |||
| Additional disclosure | |||
| Common Shares issued under DRP and the 2000 and 2008 Employee Plans | 120,000 | ||
| Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans | $ 1,198,000 | ||
| Common Shares repurchased in the open market under DRP and 401(k) Plan | 1,905,000 | ||
| Common Stock [Member] | GSWC | |||
| Additional disclosure | |||
| Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans | $ 501,000 | ||
| 2014 and 2015 Stock Repurchase Programs [Member] | AWR | |||
| Additional disclosure | |||
| Common Shares repurchased in the open market under DRP and 401(k) Plan | 1,905,000 | ||
| Stock Repurchase Program, Number of Shares Authorized to be Repurchased | 2,450,000.00 | ||
| X | ||||||||||
- Definition Represents the number of common shares authorized but unissued under the defined contribution plan. No definition available.
|
| X | ||||||||||
- Definition Represents the number of common shares authorized but unissued under the Dividend Reinvestment Plan. No definition available.
|
| X | ||||||||||
- Definition Proceeds from Stock Options Exercised, Distributed to Subsidiaries No definition available.
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Number of new stock issued during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. No definition available.
|
| X | ||||||||||
- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Dividend Limitations (Details) |
12 Months Ended | |||
|---|---|---|---|---|
|
Dec. 31, 2017
USD ($)
|
Dec. 31, 2016
USD ($)
|
Dec. 31, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
|
|
| Dividend limitations | ||||
| Common shareholder’s equity | $ 529,945,000 | $ 494,297,000 | $ 465,945,000 | $ 506,801,000 |
| Retained Earnings (Accumulated Deficit) | 279,821,000 | 247,065,000 | ||
| AWR | ||||
| Dividend limitations | ||||
| Common shareholder’s equity | 529,945,000 | 494,297,000 | ||
| Subsidiaries [Member] | ||||
| Dividend limitations | ||||
| Dividends paid | 36,500,000 | 33,800,000 | 62,000,000 | |
| GSWC | ||||
| Dividend limitations | ||||
| Fixed amount in computing maximum ability to pay dividends | $ 21,000,000.0 | |||
| Percentage of consolidated net income plus the aggregate net cash proceeds received from capital stock offerings or other instruments convertible into capital stock | 100.00% | |||
| Amount available to pay dividends under the most restrictive of the Note Agreements | $ 400,800,000 | |||
| Dividends paid | 27,680,000 | 25,450,000 | 62,000,000 | |
| Common shareholder’s equity | $ 474,374,000 | 446,770,000 | 423,730,000 | 435,190,000 |
| Ratio of Indebtedness to Net Capital | 0.4332 | |||
| Retained Earnings (Accumulated Deficit) | 206,288,000 | |||
| GSWC | Maximum | ||||
| Dividend limitations | ||||
| Ratio of Indebtedness to Net Capital | 0.6667 | |||
| Earnings Reinvested in the Business | ||||
| Dividend limitations | ||||
| Common shareholder’s equity | $ 279,821,000 | 247,065,000 | 220,923,000 | 253,602,000 |
| Earnings Reinvested in the Business | GSWC | ||||
| Dividend limitations | ||||
| Common shareholder’s equity | 232,193,000 | $ 206,288,000 | $ 184,935,000 | $ 199,583,000 |
| Retained Earnings (Accumulated Deficit) | 232,193,000 | |||
| Earnings Reinvested in the Business | American States Utility Services [Member] | ||||
| Dividend limitations | ||||
| Retained Earnings (Accumulated Deficit) | $ 62,000,000 | |||
| X | ||||||||||
- Definition The amount of dividends that may be paid or declared in any calendar year under terms of debt covenants. No definition available.
|
| X | ||||||||||
- Definition Represents the maximum fixed amount added to the variable portion of the total dividend limitation ceiling as defined by debt covenants. No definition available.
|
| X | ||||||||||
- Definition Represents the percentage of consolidated net income added to the fixed portion of the total dividend limitation ceiling as defined by debt covenants. No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition Cash outflow from subsidiaries in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. No definition available.
|
| X | ||||||||||
- Definition Indebtedness divided by net capital. No definition available.
|
| X | ||||||||||
- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
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| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Bank Debt (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Short-term borrowing activities (excluding letters of credit) | ||
| Balance outstanding at the end of the period | $ 59,000,000 | $ 90,000,000 |
| Short-term borrowing (excluding letters of credit) | ||
| Short-term borrowing activities (excluding letters of credit) | ||
| Balance outstanding at the end of the period | $ 59,000,000 | $ 90,000,000 |
| Interest Rate at the end of the period (as a percent) | 2.28% | 1.46% |
| Average amount outstanding | $ 65,242,000 | $ 59,261,000 |
| Weighted Average Annual Interest Rate (as a percent) | 1.69% | 1.20% |
| Maximum Amount Outstanding | $ 102,500,000 | $ 96,000,000 |
| Syndicated revolving credit facility | ||
| Bank debt | ||
| Variable rate basis | Euro rate | |
| Syndicated revolving credit facility | Minimum | ||
| Short-term borrowing activities (excluding letters of credit) | ||
| Interest coverage ratio | 325.00% | |
| Syndicated revolving credit facility | Maximum | ||
| Short-term borrowing activities (excluding letters of credit) | ||
| Total funded debt ratio | 65.00% | |
| Syndicated revolving credit facility | Letter of Credit Irrevocable Franchise Agreement with City of Rancho Cordova [Member] | ||
| Bank debt | ||
| Letter of credit, amount | $ 15,000,000 | |
| AWR | ||
| Bank debt | ||
| Maximum borrowing capacity | 150,000,000 | |
| Short-term borrowing activities (excluding letters of credit) | ||
| Balance outstanding at the end of the period | $ 59,000,000 | $ 90,000,000 |
| AWR | Syndicated revolving credit facility | ||
| Short-term borrowing activities (excluding letters of credit) | ||
| Interest coverage ratio | 754.00% | |
| Total funded debt ratio | 42.00% | |
| AWR | Syndicated revolving credit facility | Minimum | ||
| Short-term borrowing activities (excluding letters of credit) | ||
| Interest coverage ratio | 325.00% | |
| Total funded debt ratio | 65.00% | |
| AWR | Syndicated revolving credit facility | Maximum | ||
| Short-term borrowing activities (excluding letters of credit) | ||
| Total funded debt ratio | 100.00% | |
| AWR | Syndicated revolving credit facility | Letters of credit | ||
| Bank debt | ||
| Maximum borrowing capacity | $ 25,000,000 | |
| Letter of credit, amount | $ 6,300,000 | |
| Letter of credit fee (as a percent) | 0.65% | |
| AWR | Syndicated revolving credit facility | Letter of Credit Business Automobile Insurance Policy Security [Member] | ||
| Bank debt | ||
| Letter of credit, amount | $ 340,000 | |
| AWR | Syndicated revolving credit facility | Letter of Credit - Purchase of power | ||
| Bank debt | ||
| Letter of credit, amount | 585,000,000 | |
| AWR | Syndicated revolving credit facility | Letter of Credit - American Recovery and Reinvestment Act | ||
| Bank debt | ||
| Letter of credit, amount | $ 5,400,000 | |
| X | ||||||||||
- Definition Represents the funded debt ratio required to be maintained for debt instrument. No definition available.
|
| X | ||||||||||
- Definition Represents the interest coverage ratio required to be maintained for debt instrument. No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. No definition available.
|
| X | ||||||||||
- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. No definition available.
|
| X | ||||||||||
- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. No definition available.
|
| X | ||||||||||
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Current portion of the total carrying amount as of the balance sheet date due within one year or the operating cycle, if longer, on all notes payable to banks paid on an installment with long term maturities. This can include the amount of any loans from the applicant firm. This does not, however, include any mortgage balances. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Weighted average interest rate of short-term debt outstanding calculated at point in time. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period. No definition available.
|
| X | ||||||||||
- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, the maximum amount borrowed at any time during the period. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
|
Long-Term Debt (Details) |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2017
USD ($)
|
Dec. 31, 2016 |
Dec. 31, 2014
USD ($)
|
|
| GSWC | |||
| Long-term debt | |||
| Ratio of Indebtedness to Net Capital | 0.4332 | ||
| Ratio of Indebtedness to EBITDA | 2.5 | ||
| GSWC | Maximum | |||
| Long-term debt | |||
| Ratio of Indebtedness to Net Capital | 0.6667 | ||
| Ratio of Indebtedness to EBITDA | 8 | ||
| Private Placement Notes [Member] | GSWC | |||
| Long-term debt | |||
| Interest coverage ratio | 400.00% | ||
| Private Placement Notes [Member] | GSWC | Minimum | |||
| Long-term debt | |||
| Interest coverage ratio | 200.00% | ||
| Private placement notes | |||
| Long-term debt | |||
| Interest rate (as a percent) | 9.56% | 9.56% | |
| Private placement notes | GSWC | |||
| Long-term debt | |||
| Debt Instrument, Face Amount | $ 28,000,000 | ||
| Interest rate (as a percent) | 9.56% | 9.56% | |
| Debt Instrument Redemption Premium above Treasury Yield | 5500.00% | ||
| Private placement notes | GSWC | Maximum | |||
| Long-term debt | |||
| Redemption premium after 2021 (as a percent) | 3.00% | ||
| Private placement notes | American States Utility Services [Member] | |||
| Long-term debt | |||
| Interest rate (as a percent) | 9.56% | ||
| Notes Payable 5.87 Percent Due 2028 [Member] | |||
| Long-term debt | |||
| Interest rate (as a percent) | 5.87% | 5.87% | |
| Notes Payable 5.87 Percent Due 2028 [Member] | GSWC | |||
| Long-term debt | |||
| Interest rate (as a percent) | 5.87% | 5.87% | |
| Notes Payable 5.87 Percent Due 2028 [Member] | American States Utility Services [Member] | |||
| Long-term debt | |||
| Interest rate (as a percent) | 5.87% | ||
| Notes Payable 6.7 Percent Due 2019 [Member] | |||
| Long-term debt | |||
| Interest rate (as a percent) | 6.70% | 6.70% | |
| Notes Payable 6.7 Percent Due 2019 [Member] | GSWC | |||
| Long-term debt | |||
| Interest rate (as a percent) | 6.70% | 6.70% | |
| Notes Payable 6.7 Percent Due 2019 [Member] | American States Utility Services [Member] | |||
| Long-term debt | |||
| Interest rate (as a percent) | 6.70% | ||
| Senior Notes issued to Co-Bank | GSWC | |||
| Long-term debt | |||
| Additional spread on premium (as a percent) | 0.50% | ||
| American Recovery and Reinvestment Act Obligation due 2033 | GSWC | |||
| Long-term debt | |||
| Interest rate (as a percent) | 2.50% | ||
| Notes Payable 3.45 Percent Due 2029 [Member] | |||
| Long-term debt | |||
| Interest rate (as a percent) | 3.45% | 3.45% | |
| Notes Payable 3.45 Percent Due 2029 [Member] | GSWC | |||
| Long-term debt | |||
| Debt Instrument, Face Amount | $ 15,000,000 | $ 15,000,000 | |
| Interest rate (as a percent) | 3.45% | 3.45% | 3.45% |
| X | ||||||||||
- Definition Represents the additional spread on premium based on the difference between cost of funds on the date of purchase and the date of redemption, expressed as a percentage. No definition available.
|
| X | ||||||||||
- Definition Represents the interest coverage ratio required to be maintained for debt instrument. No definition available.
|
| X | ||||||||||
- Definition Represents the redemption premium as a percentage of the par value of debt instrument after the specified period. No definition available.
|
| X | ||||||||||
- Definition Debt Instrument Redemption Premium above Treasury Yield No definition available.
|
| X | ||||||||||
- Definition Ratio of Indebtedness to EBITDA No definition available.
|
| X | ||||||||||
- Definition Face (par) amount of debt instrument at time of issuance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Indebtedness divided by net capital. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Long-Term Debt 2 (Details) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Annual maturities of all long-term debt, including capitalized leases | ||
| Total | $ 325,265 | $ 325,582 |
| GSWC | ||
| Annual maturities of all long-term debt, including capitalized leases | ||
| 2014 | 324 | |
| 2015 | 40,321 | |
| 2016 | 345 | |
| 2017 | 366 | |
| 2018 | 389 | |
| Thereafter | 283,520 | |
| Total | $ 325,265 |
| X | ||||||||||
- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Principal amount of long-term debt and capital lease obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. No definition available.
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| X | ||||||||||
- Definition Principal amount of long-term debt and capital lease obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. No definition available.
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| X | ||||||||||
- Definition Principal amount of long-term debt and capital lease obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. No definition available.
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| X | ||||||||||
- Definition Principal amount of long-term debt and capital lease obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. No definition available.
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| X | ||||||||||
- Definition Principal amount of long-term debt and capital lease obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. No definition available.
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| X | ||||||||||
- Definition Principal amount of long-term debt and capital lease obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Details
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Long-Term Debt 3 (Details) |
12 Months Ended | |||
|---|---|---|---|---|
|
Dec. 31, 2017
USD ($)
|
Dec. 31, 2016 |
Dec. 31, 2014
USD ($)
|
Oct. 31, 2009
USD ($)
|
|
| Notes Payable 3.45 Percent Due 2029 [Member] | ||||
| Long-term debt | ||||
| Interest rate (as a percent) | 3.45% | 3.45% | ||
| GSWC | ||||
| Long-term debt | ||||
| Ratio of Indebtedness to EBITDA | 2.5 | |||
| GSWC | Maximum | ||||
| Long-term debt | ||||
| Ratio of Indebtedness to EBITDA | 8 | |||
| GSWC | Private Placement Notes [Member] | ||||
| Long-term debt | ||||
| Debt Instrument Covenant Interest Coverage Ratio | 400.00% | |||
| GSWC | Private Placement Notes [Member] | Minimum [Member] | ||||
| Long-term debt | ||||
| Debt Instrument Covenant Interest Coverage Ratio | 200.00% | |||
| GSWC | Notes Payable 3.45 Percent Due 2029 [Member] | ||||
| Long-term debt | ||||
| Debt Instrument, Face Amount | $ 15,000,000 | $ 15,000,000 | ||
| Interest rate (as a percent) | 3.45% | 3.45% | 3.45% | |
| GSWC | American Recovery and Reinvestment Act Obligation due 2033 | ||||
| Long-term debt | ||||
| Maximum amount of loan that can be borrowed | $ 9,000,000.0 | |||
| Interest rate (as a percent) | 2.50% | |||
| Maturity term | 20 years | |||
| Loan proceeds received for reimbursement of costs of conversion | $ 8,600,000 | |||
| GSWC | American Recovery and Reinvestment Act Obligation due 2033 | Letters of credit to CDHP | ||||
| Long-term debt | ||||
| Amount of debt issued | $ 5,400,000.0 |
| X | ||||||||||
- Definition Represents the interest coverage ratio required to be maintained for debt instrument. No definition available.
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| X | ||||||||||
- Definition Represents the term of the debt instrument. No definition available.
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| X | ||||||||||
- Definition Ratio of Indebtedness to EBITDA No definition available.
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| X | ||||||||||
- Definition Face (par) amount of debt instrument at time of issuance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. No definition available.
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| X | ||||||||||
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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Taxes on Income (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Taxes on income | |||
| Unrecognized Tax Benefits | $ 0 | ||
| Deferred tax assets: | |||
| Regulatory-liability-related: ITC and excess deferred taxes | 32,761,000 | $ 903,000 | |
| Regulatory-liability-related: California Corp Franchise Tax | 1,806,000 | 3,365,000 | |
| Other nonproperty-related | 2,509,000 | 1,993,000 | |
| Contributions and advances | 4,679,000 | 7,464,000 | |
| Deferred tax assets | 41,755,000 | 13,725,000 | |
| Deferred tax liabilities: | |||
| Fixed assets | (130,115,000) | (200,378,000) | |
| Regulatory-asset-related: depreciation and other | (16,851,000) | (24,402,000) | |
| Deferred Tax Liabilities, Regulatory Assets and Liabilities Related to State Franchise Tax | (528,000) | (2,033,000) | |
| Other nonproperty-related | (47,000) | 0 | |
| Balancing and memorandum accounts | (7,311,000) | (7,010,000) | |
| Deferred charges | (2,594,000) | (4,429,000) | |
| Deferred tax liabilities | (157,446,000) | (238,252,000) | |
| Accumulated deferred income taxes - net | (115,691,000) | (224,527,000) | |
| Current | |||
| Federal | 20,978,000 | 2,297,000 | $ 21,866,000 |
| State | 5,844,000 | 4,798,000 | 5,442,000 |
| Total current tax expense | 26,822,000 | 7,095,000 | 27,308,000 |
| Deferred | |||
| Federal | 11,543,000 | 26,715,000 | 8,948,000 |
| State | 609,000 | 925,000 | 1,475,000 |
| Total deferred tax expense | 12,152,000 | 27,640,000 | 10,423,000 |
| Reconciliations of the effective tax rates to the federal statutory rate | |||
| Federal taxes on pretax income at statutory rate | 37,919,000 | 33,067,000 | 34,375,000 |
| Flow-through on removal costs | (1,421,000) | (78,000) | (1,560,000) |
| Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount | (93,000) | (83,000) | (88,000) |
| Income tax expense/(benefit) | 38,974,000 | 34,735,000 | 37,731,000 |
| Pretax income from continuing operations | $ 108,341,000 | $ 94,478,000 | $ 98,215,000 |
| Effective income tax rate (as a percent) | 36.00% | 36.80% | 38.40% |
| Increase (decrease) in taxes resulting from: | $ 4,382,000 | $ 3,029,000 | $ 4,843,000 |
| Adjustments recorded to revalue deferred taxes as a result of the tax cut and job act of 2017 effective tax rate impact | (82,000) | 0 | 0 |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation, Amount | 845,000 | 994,000 | 626,000 |
| Income Tax Reconciliation Flow Through on Pension Costs | 412,000 | (247,000) | 267,000 |
| Income Tax Reconciliation Cost of Removal | (1,980,000) | (2,068,000) | (929,000) |
| Reduction to cumulative net deferred income tax liabilities | 90,100,000 | ||
| Income Tax Examination, Penalties Accrued | 0 | 0 | |
| Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | (1,008,000) | 121,000 | 197,000 |
| Income Tax Examination, Penalties Expense | 0 | 0 | |
| Proceeds from Income Tax Refunds | 2,200,000 | 2,100,000 | |
| GSWC | |||
| Deferred tax assets: | |||
| Regulatory-liability-related: ITC and excess deferred taxes | 32,761,000 | 903,000 | |
| Regulatory-liability-related: California Corp Franchise Tax | 1,806,000 | 3,365,000 | |
| Other nonproperty-related | 2,230,000 | 1,901,000 | |
| Contributions and advances | 5,022,000 | 7,712,000 | |
| Deferred tax assets | 41,819,000 | 13,881,000 | |
| Deferred tax liabilities: | |||
| Fixed assets | (134,437,000) | (203,133,000) | |
| Regulatory-asset-related: depreciation and other | (16,851,000) | (24,402,000) | |
| Deferred Tax Liabilities, Regulatory Assets and Liabilities Related to State Franchise Tax | (552,000) | (2,208,000) | |
| Other nonproperty-related | (53,000) | (68,000) | |
| Balancing and memorandum accounts | (7,897,000) | (7,271,000) | |
| Deferred charges | (2,809,000) | (4,597,000) | |
| Deferred tax liabilities | (162,599,000) | (241,679,000) | |
| Accumulated deferred income taxes - net | (120,780,000) | (227,798,000) | |
| Current | |||
| Federal | 15,044,000 | (3,115,000) | 16,196,000 |
| State | 5,045,000 | 3,625,000 | 5,557,000 |
| Total current tax expense | 20,089,000 | 510,000 | 21,753,000 |
| Deferred | |||
| Federal | 11,770,000 | 25,864,000 | 8,536,000 |
| State | 2,200,000 | 2,235,000 | 2,183,000 |
| Total deferred tax expense | 13,970,000 | 28,099,000 | 10,719,000 |
| Reconciliations of the effective tax rates to the federal statutory rate | |||
| Federal taxes on pretax income at statutory rate | 30,736,000 | 26,452,000 | 28,022,000 |
| Flow-through on removal costs | (1,148,000) | 0 | (1,268,000) |
| Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount | (93,000) | (82,000) | (88,000) |
| Income tax expense/(benefit) | 34,059,000 | 28,609,000 | 32,472,000 |
| Pretax income from continuing operations | $ 87,816,000 | $ 75,578,000 | $ 80,063,000 |
| Effective income tax rate (as a percent) | 38.80% | 37.90% | 40.60% |
| Increase (decrease) in taxes resulting from: | $ 4,924,000 | $ 3,118,000 | $ 5,151,000 |
| Adjustments recorded to revalue deferred taxes as a result of the tax cut and job act of 2017 effective tax rate impact | 1,063,000 | 0 | 0 |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation, Amount | 845,000 | 994,000 | 626,000 |
| Income Tax Reconciliation Flow Through on Pension Costs | 412,000 | (247,000) | 267,000 |
| Income Tax Reconciliation Cost of Removal | (1,980,000) | (2,068,000) | (929,000) |
| Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | $ (700,000) | $ 442,000 | $ 691,000 |
| X | ||||||||||
- Definition Represents the amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences derived from contributions and advances. No definition available.
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| X | ||||||||||
- Definition Represents the amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences derived from other nonproperty. No definition available.
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences derived from regulatory assets and liabilities related to ITC and excess deferred taxes. No definition available.
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences derived from regulatory assets and liabilities related to state franchise tax. No definition available.
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| X | ||||||||||
- Definition Represents the amount of deferred tax liability attributable to taxable temporary differences from balancing and memorandum accounts. No definition available.
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| X | ||||||||||
- Definition Represents the amount of deferred tax liability attributable to taxable temporary differences from other nonproperty. No definition available.
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| X | ||||||||||
- Definition Deferred Tax Liabilities, Regulatory Assets and Liabilities Related to State Franchise Tax No definition available.
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| X | ||||||||||
- Definition Effective income tax rate reconciliation, 2017 tax cuts and job act impact No definition available.
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| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
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| X | ||||||||||
- Definition The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to flow-through on Cost of Removal. No definition available.
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| X | ||||||||||
- Definition The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to flow-through on pension costs. No definition available.
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| X | ||||||||||
- Definition The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to Production Activities No definition available.
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| X | ||||||||||
- Definition Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of deferred tax liability attributable to taxable temporary differences. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of deferred tax liability attributable to taxable temporary differences from capitalized costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of deferred tax liability attributable to taxable temporary differences from regulatory assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The amount of estimated penalties accrued as of the balance sheet date arising from income tax examinations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The amount of estimated penalties recognized in the period arising from income tax examinations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible depreciation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to investment tax credit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of cash received during the period as refunds for the overpayment of taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Employee Benefit Plans Employee Benefit Plans 1 (Details) - Pension Plan |
12 Months Ended |
|---|---|
|
Dec. 31, 2017
item
participant
| |
| Employee benefit plans | |
| Minimum age for eligibility under the Pension Plan | item | 21 |
| Minimum period of service for eligibility under the Pension Plan | 5 years |
| Normal retirement benefit (as a percent) | 2.00% |
| Number of highest consecutive years' average earnings used in computing retirement benefit | 5 years |
| Maximum number of years of credited service considered in determining retirement benefit | 40 years |
| Number of participants in the Pension Plan | participant | 949 |
| Percentage of participant's eligible pay contributed to the plan by the employer | 5.25% |
| Eligibility for employer matching contributions, period of service | 3 years |
| X | ||||||||||
- Definition Represents the maximum number of years of credited service used in computing the retirement benefit. No definition available.
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| X | ||||||||||
- Definition Represents the minimum age required by the employees to be eligible to participate in the plan. No definition available.
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| X | ||||||||||
- Definition Represents the minimum period of service required in order to participate in the plan. No definition available.
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| X | ||||||||||
- Definition Represents the number of highest consecutive years' average earnings used in computing the retirement benefit. No definition available.
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| X | ||||||||||
- Definition Defined Benefit Plan, Number of Employees Covered No definition available.
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| X | ||||||||||
- Definition Represents the percentage of normal retirement benefit. No definition available.
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| X | ||||||||||
- Definition The period of service required in order to be eligible for the employer's matching contributions. No definition available.
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. No definition available.
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| X | ||||||||||
- Details
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Employee Benefit Plans Employee Benefit Plans 2 (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Pension Benefits | |||
| Change in Projected Benefit Obligation: | |||
| Projected benefit obligation at beginning of year | $ 180,364 | $ 168,934 | |
| Service cost | 4,999 | 5,094 | $ 6,276 |
| Interest cost | 7,904 | 7,910 | 7,686 |
| Actuarial (gain) loss | 20,397 | 4,162 | |
| Benefits/expenses paid | (5,974) | (5,736) | |
| Projected benefit obligation at end of year | 207,690 | 180,364 | 168,934 |
| Changes in Plan Assets: | |||
| Fair value of plan assets at beginning of year | 150,872 | 142,174 | |
| Actual return on plan assets | 22,246 | 9,182 | |
| Employer contributions | 6,504 | 5,252 | |
| Benefits/expenses paid | 5,974 | 5,736 | |
| Fair value of plan assets at end of year | 173,648 | 150,872 | 142,174 |
| Funded Status: | |||
| Net amount recognized as accrued pension cost | (34,042) | (29,492) | |
| Post-Retirement Medical Benefits | |||
| Change in Projected Benefit Obligation: | |||
| Projected benefit obligation at beginning of year | 8,802 | 9,393 | |
| Service cost | 227 | 247 | 340 |
| Interest cost | 324 | 371 | 435 |
| Actuarial (gain) loss | (355) | (715) | |
| Benefits/expenses paid | (507) | (494) | |
| Projected benefit obligation at end of year | 8,491 | 8,802 | 9,393 |
| Changes in Plan Assets: | |||
| Fair value of plan assets at beginning of year | 10,538 | 10,614 | |
| Actual return on plan assets | 1,022 | 418 | |
| Employer contributions | 0 | 0 | |
| Benefits/expenses paid | 507 | 494 | |
| Fair value of plan assets at end of year | 11,053 | 10,538 | $ 10,614 |
| Funded Status: | |||
| Net amount recognized as accrued pension cost | $ 2,562 | $ 1,736 | |
| X | ||||||||||
- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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| X | ||||||||||
- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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Employee Benefit Plans Employee Benefit Plans 3 (Details) - USD ($) $ in Thousands |
12 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Amounts recognized on the balance sheets: | |||||
| Non-current liabilities | $ 57,695 | $ 49,856 | |||
| Pension Benefits | |||||
| Amounts recognized on the balance sheets: | |||||
| Non-current assets | 0 | 0 | |||
| Current liabilities | 0 | 0 | |||
| Non-current liabilities | 34,042 | 29,492 | |||
| Net amount recognized | (34,042) | (29,492) | |||
| Amounts recognized in regulatory assets consist of: | |||||
| Prior service cost (credit) | 0 | 0 | |||
| Net (gain) loss | (32,761) | (25,828) | |||
| Regulatory assets (liabilities) | $ 25,828 | $ 21,970 | $ 21,970 | 32,761 | 25,828 |
| Unfunded accrued pension cost | 1,281 | 3,664 | |||
| Net liability (asset) recognized | 34,042 | 29,492 | |||
| Changes in plan assets and benefit obligations recognized in regulatory assets: | |||||
| Regulatory asset at beginning of year | 25,828 | 21,970 | |||
| Net loss (gain) | (7,856) | (4,818) | |||
| Amortization of prior service (cost) credit | 0 | (49) | |||
| Amortization of net gain (loss) | (923) | (911) | |||
| Total change in regulatory asset | 6,933 | 3,858 | |||
| Regulatory asset (liability) at end of year | 32,761 | 25,828 | 21,970 | ||
| Net periodic pension costs | 4,121 | 4,126 | 6,075 | ||
| Change in regulatory asset | 6,933 | 3,858 | |||
| Total recognized in net periodic pension cost and regulatory asset (liability) | 11,054 | 7,984 | |||
| Estimated amounts that will be amortized from regulatory asset over the next fiscal year: | |||||
| Prior service (cost) credit | 0 | 0 | |||
| Net gain (loss) | (1,378) | (835) | |||
| Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: | |||||
| Projected benefit obligation | 207,690 | 180,364 | |||
| Accumulated benefit obligation | 190,438 | 165,998 | |||
| Fair value of plan assets | $ 173,648 | $ 150,872 | |||
| Weighted-average assumptions used to determine benefit obligations at December 31: | |||||
| Discount rate | 3.76% | 4.44% | |||
| Post-Retirement Medical Benefits | |||||
| Amounts recognized on the balance sheets: | |||||
| Non-current assets | $ 2,562 | $ 1,736 | |||
| Current liabilities | 0 | 0 | |||
| Non-current liabilities | 0 | 0 | |||
| Net amount recognized | 2,562 | 1,736 | |||
| Amounts recognized in regulatory assets consist of: | |||||
| Prior service cost (credit) | 0 | 0 | |||
| Net (gain) loss | 5,650 | 5,515 | |||
| Regulatory assets (liabilities) | (5,515) | (5,606) | (5,606) | (5,650) | (5,515) |
| Unfunded accrued pension cost | 3,088 | 3,779 | |||
| Net liability (asset) recognized | (2,562) | (1,736) | |||
| Changes in plan assets and benefit obligations recognized in regulatory assets: | |||||
| Regulatory asset at beginning of year | (5,515) | (5,606) | |||
| Net loss (gain) | 910 | 644 | |||
| Amortization of prior service (cost) credit | 0 | 34 | |||
| Amortization of net gain (loss) | 775 | 701 | |||
| Total change in regulatory asset | (135) | 91 | |||
| Regulatory asset (liability) at end of year | (5,650) | (5,515) | (5,606) | ||
| Net periodic pension costs | (690) | (606) | $ (234) | ||
| Change in regulatory asset | (135) | 91 | |||
| Total recognized in net periodic pension cost and regulatory asset (liability) | (825) | (515) | |||
| Estimated amounts that will be amortized from regulatory asset over the next fiscal year: | |||||
| Prior service (cost) credit | 0 | 0 | |||
| Net gain (loss) | $ 727 | $ 679 | |||
| Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: | |||||
| Projected benefit obligation | 8,491 | 8,802 | |||
| Fair value of plan assets | $ 11,053 | $ 10,538 | |||
| Weighted-average assumptions used to determine benefit obligations at December 31: | |||||
| Discount rate | 3.52% | 3.97% | |||
| Minimum | Pension Benefits | |||||
| Weighted-average assumptions used to determine benefit obligations at December 31: | |||||
| Rate of compensation increase | 3.00% | ||||
| Maximum | Pension Benefits | |||||
| Weighted-average assumptions used to determine benefit obligations at December 31: | |||||
| Rate of compensation increase | 8.00% | ||||
| X | ||||||||||
- Definition Represents the amortization of net losses that are recognized as a component of regulatory assets (liability). No definition available.
|
| X | ||||||||||
- Definition Represents the net gains (losses) that are not recognized immediately and are expected to be recognized as components of regulatory asset over the next fiscal year that follows the most recent annual statement of financial position presented. No definition available.
|
| X | ||||||||||
- Definition Represents the amortization of prior service cost (credit) that are recognized as a component of regulatory assets (liability). No definition available.
|
| X | ||||||||||
- Definition Represents the net gains and losses recognized in regulatory asset (liability). No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition Represents the amount recognized in regulatory asset (liability). No definition available.
|
| X | ||||||||||
- Definition Represents the prior service cost (credit) recognized in regulatory asset (liability). No definition available.
|
| X | ||||||||||
- Definition Defined Benefit Plan, Amounts Recognized in Regulatory Assets (Liabilities), Net No definition available.
|
| X | ||||||||||
- Definition Represents the amount of unfunded accrued pension cost recognized in regulatory assets that is associated with the defined benefit pension plans and other post-retirement defined benefit plans. No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition Represents the net amount of loss (gain) that are recognized as a component of regulatory assets (liability). No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition Represents the net amount of loss (gain) that are recognized as a component of regulatory assets. No definition available.
|
| X | ||||||||||
- Definition Represents the amount recognized in net periodic pension cost and regulatory asset. No definition available.
|
| X | ||||||||||
- Definition Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of accumulated benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Fair value of plan assets for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Employee Benefit Plans Employee Benefit Plans 4 (Details) - USD ($) $ in Thousands |
12 Months Ended | |||||
|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
||||
| Pension Benefits | ||||||
| Components of Net Periodic Benefits Cost: | ||||||
| Service cost | $ 4,999 | $ 5,094 | $ 6,276 | |||
| Interest cost | 7,904 | 7,910 | 7,686 | |||
| Expected return on plan assets | (9,705) | (9,838) | (9,795) | |||
| Amortization of transition | 0 | 0 | 0 | |||
| Amortization of prior service cost (credit) | 0 | 49 | 118 | |||
| Amortization of actuarial (gain) loss | 923 | 911 | 1,790 | |||
| Net periodic pension cost under accounting standards | 4,121 | 4,126 | 6,075 | |||
| Regulatory adjustment - over collection | (465) | (859) | (523) | |||
| Total expense recognized, before allocation to overhead pool | $ 4,586 | $ 4,985 | $ 6,598 | |||
| Weighted-average assumptions used to determine net periodic cost: | ||||||
| Discount rate | 4.44% | 4.65% | 4.25% | |||
| Expected long-term return on plan assets | 6.50% | 7.00% | 7.00% | |||
| Rate of compensation increase | 4.00% | |||||
| Expected long-term return on plan assets | 6.50% | 7.00% | 7.00% | |||
| Post-Retirement Medical Benefits | ||||||
| Components of Net Periodic Benefits Cost: | ||||||
| Service cost | $ 227 | $ 247 | $ 340 | |||
| Interest cost | 324 | 371 | 435 | |||
| Expected return on plan assets | (466) | (489) | (493) | |||
| Amortization of transition | 0 | 0 | 0 | |||
| Amortization of prior service cost (credit) | 0 | (34) | (200) | |||
| Amortization of actuarial (gain) loss | (775) | (701) | (316) | |||
| Net periodic pension cost under accounting standards | (690) | (606) | (234) | |||
| Regulatory adjustment - over collection | 0 | 0 | 0 | |||
| Total expense recognized, before allocation to overhead pool | $ (690) | $ (606) | $ (234) | |||
| Weighted-average assumptions used to determine net periodic cost: | ||||||
| Discount rate | 3.97% | 4.25% | 3.80% | |||
| Union plan | ||||||
| Weighted-average assumptions used to determine net periodic cost: | ||||||
| Expected long-term return on plan assets | 6.00% | [1] | 7.00% | 7.00% | ||
| Expected long-term return on plan assets | 6.00% | [1] | 7.00% | 7.00% | ||
| Non-union plan | ||||||
| Weighted-average assumptions used to determine net periodic cost: | ||||||
| Expected long-term return on plan assets | 4.20% | [1] | 4.20% | 4.20% | ||
| Expected long-term return on plan assets | 4.20% | [1] | 4.20% | 4.20% | ||
| Minimum | Pension Benefits | ||||||
| Weighted-average assumptions used to determine net periodic cost: | ||||||
| Rate of compensation increase | 3.00% | |||||
| Maximum | Pension Benefits | ||||||
| Weighted-average assumptions used to determine net periodic cost: | ||||||
| Rate of compensation increase | 8.00% | |||||
| ||||||
| X | ||||||||||
- Definition The total amount of net periodic benefit cost for defined benefit plans during the period, before allocation to overhead pool. No definition available.
|
| X | ||||||||||
- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of transition asset (obligation) recognized in net periodic benefit (cost) credit of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
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Employee Benefit Plans Employee Benefit Plans 5 (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Pension Benefits | |||
| Employee benefit plans | |||
| Regulatory adjustment - over collection | $ (465) | $ (859) | $ (523) |
| GSWC | Pension Benefits | |||
| Employee benefit plans | |||
| Regulatory adjustment - over collection | (583) | $ (859) | $ (523) |
| Pension Costs and Other Postretirement Benefit Costs | GSWC | |||
| Employee benefit plans | |||
| Regulatory asset authorized under settlement | 34,700 | ||
| Two-way pension balancing account | Pension Costs and Other Postretirement Benefit Costs | GSWC | |||
| Employee benefit plans | |||
| Regulatory asset authorized under settlement | $ 1,700 | ||
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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| X | ||||||||||
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| X | ||||||||||
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Employee Benefit Plans Employee Benefit Plans 6 (Details) |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Pension Benefits | ||
| Employee benefit plans | ||
| Actual asset allocations | 100.00% | 100.00% |
| Target asset allocations | 100.00% | |
| Pension Benefits | Equity securities | ||
| Employee benefit plans | ||
| Actual asset allocations | 57.00% | 57.00% |
| Target asset allocations | 60.00% | |
| Pension Benefits | Debt securities | ||
| Employee benefit plans | ||
| Actual asset allocations | 39.00% | 38.00% |
| Target asset allocations | 40.00% | |
| Pension Benefits | Real Estate Funds | ||
| Employee benefit plans | ||
| Actual asset allocations | 4.00% | 5.00% |
| Pension Benefits | Cash equivalents | ||
| Employee benefit plans | ||
| Actual asset allocations | 0.00% | 0.00% |
| Post-Retirement Medical Benefits | ||
| Employee benefit plans | ||
| Actual asset allocations | 100.00% | 100.00% |
| Target asset allocations | 100.00% | |
| Post-Retirement Medical Benefits | Equity securities | ||
| Employee benefit plans | ||
| Actual asset allocations | 59.00% | 58.00% |
| Target asset allocations | 60.00% | |
| Post-Retirement Medical Benefits | Debt securities | ||
| Employee benefit plans | ||
| Actual asset allocations | 37.00% | 39.00% |
| Target asset allocations | 40.00% | |
| Post-Retirement Medical Benefits | Real Estate Funds | ||
| Employee benefit plans | ||
| Actual asset allocations | 0.00% | 0.00% |
| Post-Retirement Medical Benefits | Cash equivalents | ||
| Employee benefit plans | ||
| Actual asset allocations | 4.00% | 3.00% |
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Employee Benefit Plans Employee Benefit Plans 7 (Details) - Pension Benefits - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|---|
| Employee benefit plans | |||
| Fair Value | $ 173,648 | $ 150,872 | $ 142,174 |
| Unfunded Commitments | 0 | 0 | |
| Cash equivalents | |||
| Employee benefit plans | |||
| Fair Value | 489 | 500 | |
| Unfunded Commitments | 0 | 0 | |
| Fixed income fund | |||
| Employee benefit plans | |||
| Fair Value | 66,669 | 57,674 | |
| Unfunded Commitments | 0 | 0 | |
| U.S. small/mid cap funds | |||
| Employee benefit plans | |||
| Fair Value | 26,998 | 24,312 | |
| Unfunded Commitments | 0 | 0 | |
| U.S. large cap funds | |||
| Employee benefit plans | |||
| Fair Value | 53,985 | 46,175 | |
| Unfunded Commitments | 0 | 0 | |
| International funds | |||
| Employee benefit plans | |||
| Fair Value | 17,893 | 14,869 | |
| Unfunded Commitments | 0 | 0 | |
| Total equity funds | |||
| Employee benefit plans | |||
| Fair Value | 98,876 | 85,356 | |
| Unfunded Commitments | 0 | ||
| Real estate funds | |||
| Employee benefit plans | |||
| Fair Value | 7,614 | 7,342 | |
| Unfunded Commitments | $ 0 | $ 0 |
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Employee Benefit Plans Employee Benefit Plans 8 (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Post-Retirement Medical Benefits | |||
| Employee benefit plans | |||
| Fair value of post-retirement plan assets | $ 11,053 | $ 10,538 | $ 10,614 |
| Post-Retirement Medical Benefits | Level 1 | |||
| Employee benefit plans | |||
| Fair value of post-retirement plan assets | 11,060 | 10,538 | |
| Post-Retirement Medical Benefits | Level 2 | |||
| Employee benefit plans | |||
| Fair value of post-retirement plan assets | 0 | 0 | |
| Post-Retirement Medical Benefits | Level 3 | |||
| Employee benefit plans | |||
| Fair value of post-retirement plan assets | 0 | 0 | |
| Post-Retirement Medical Benefits | Cash equivalents | Level 1 | |||
| Employee benefit plans | |||
| Fair value of post-retirement plan assets | 189 | 360 | |
| Post-Retirement Medical Benefits | Cash equivalents | Level 2 | |||
| Employee benefit plans | |||
| Fair value of post-retirement plan assets | 0 | 0 | |
| Post-Retirement Medical Benefits | Cash equivalents | Level 3 | |||
| Employee benefit plans | |||
| Fair value of post-retirement plan assets | 0 | 0 | |
| Post-Retirement Medical Benefits | Fixed income fund | Level 1 | |||
| Employee benefit plans | |||
| Fair value of post-retirement plan assets | 4,364 | 4,072 | |
| Post-Retirement Medical Benefits | Fixed income fund | Level 2 | |||
| Employee benefit plans | |||
| Fair value of post-retirement plan assets | 0 | 0 | |
| Post-Retirement Medical Benefits | Fixed income fund | Level 3 | |||
| Employee benefit plans | |||
| Fair value of post-retirement plan assets | 0 | 0 | |
| Post-Retirement Medical Benefits | U.S. large cap funds | Level 1 | |||
| Employee benefit plans | |||
| Fair value of post-retirement plan assets | 6,507 | 6,106 | |
| Post-Retirement Medical Benefits | U.S. large cap funds | Level 2 | |||
| Employee benefit plans | |||
| Fair value of post-retirement plan assets | 0 | 0 | |
| Post-Retirement Medical Benefits | U.S. large cap funds | Level 3 | |||
| Employee benefit plans | |||
| Fair value of post-retirement plan assets | 0 | 0 | |
| Fair Value | Post-Retirement Medical Benefits | |||
| Employee benefit plans | |||
| Fair value of post-retirement plan assets | 11,060 | 10,538 | |
| Fair Value | Post-Retirement Medical Benefits | Cash equivalents | |||
| Employee benefit plans | |||
| Fair value of post-retirement plan assets | 189 | 360 | |
| Fair Value | Post-Retirement Medical Benefits | Fixed income fund | |||
| Employee benefit plans | |||
| Fair value of post-retirement plan assets | 4,364 | 4,072 | |
| Fair Value | Post-Retirement Medical Benefits | U.S. large cap funds | |||
| Employee benefit plans | |||
| Fair value of post-retirement plan assets | $ 6,507 | $ 6,106 | |
| Minimum | Fixed income fund | |||
| Employee benefit plans | |||
| Maturity period of investments | 1 year | ||
| Maximum | Fixed income fund | |||
| Employee benefit plans | |||
| Maturity period of investments | 20 years |
| X | ||||||||||
- Definition Represents the maturity period of investments. No definition available.
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Details
|
Employee Benefit Plans Employee Benefit Plans 9 (Details) - Pension Benefits - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Employee benefit plans | ||
| Employer contributions | $ 6,504 | $ 5,252 |
| Expected future employer's contribution | $ 6,100 | |
| X | ||||||||||
- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
Employee Benefit Plans Employee Benefit Plans 10 (Details) $ in Thousands |
Dec. 31, 2017
USD ($)
|
|---|---|
| Pension Benefits | |
| Employee benefit plans | |
| 2018 | $ 6,737 |
| 2019 | 7,281 |
| 2020 | 7,900 |
| 2021 | 8,516 |
| 2022 | 9,196 |
| Thereafter | 54,429 |
| Total | 94,059 |
| Post-Retirement Medical Benefits | |
| Employee benefit plans | |
| 2018 | 554 |
| 2019 | 574 |
| 2020 | 632 |
| 2021 | 720 |
| 2022 | 749 |
| Thereafter | 3,365 |
| Total | $ 6,594 |
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of benefits for defined benefit plan expected to be paid in remainder of fiscal year. No definition available.
|
| X | ||||||||||
- Definition Amount of benefits for defined benefit plan expected to be paid in fifth fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of benefits for defined benefit plan expected to be paid in third fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of benefits for defined benefit plan expected to be paid in second fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Employee Benefit Plans Employee Benefit Plans 11 (Details) - USD ($) $ in Thousands |
12 Months Ended | |||||
|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
||||
| Healthcare Cost Trend Rate | ||||||
| Initial health care cost for employees under age of 65 (as a percent) | 6.20% | |||||
| Ultimate health care cost for employees under age of 65 (as a percent) | 4.50% | |||||
| Initial Health care cost for employees of age 65 and over (as a percent) | 6.20% | |||||
| Ultimate health care cost for employees of age 65 and over (as a percent) | 4.40% | |||||
| Effects of one-percentage-point change in assumed health care cost trend rates | ||||||
| Effect on total of service and interest cost components -1 Percentage Point Increase | $ 45 | |||||
| Effect on total of service and interest cost components -1 Percentage Point Decrease | (39) | |||||
| Effect on post-retirement benefit obligation -1 Percentage Point Increase | 894 | |||||
| Effect on post-retirement benefit obligation -1 Percentage Point Decrease | $ (769) | |||||
| Union plan | ||||||
| Employee benefit plans | ||||||
| Expected long-term return on plan assets | 6.00% | [1] | 7.00% | 7.00% | ||
| Non-union plan | ||||||
| Employee benefit plans | ||||||
| Expected long-term return on plan assets | 4.20% | [1] | 4.20% | 4.20% | ||
| ||||||
| X | ||||||||||
- Definition Represents the initial health care cost for employees of age sixty-five and over. No definition available.
|
| X | ||||||||||
- Definition Represents the initial health care cost for employees under age of sixty-five. No definition available.
|
| X | ||||||||||
- Definition The ultimate trend rate for health care costs for employees of age sixty-five and over. No definition available.
|
| X | ||||||||||
- Definition The ultimate trend rate for health care costs for employees under age of sixty-five. No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of increase in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point increase in assumed health care cost trend rate. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Employee Benefit Plans Employee Benefit Plans 12 (Details) - SERP - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Balance in Rabbi Trust | ||
| Balance in Rabbi Trust | $ 15,200 | |
| Fair value of assets held in Rabbi Trust | 0 | $ 0 |
| Rabbi Trust | Level 1 | ||
| Balance in Rabbi Trust | ||
| Fair value of assets held in Rabbi Trust | 15,227 | 11,996 |
| Rabbi Trust | Level 2 | ||
| Balance in Rabbi Trust | ||
| Fair value of assets held in Rabbi Trust | 0 | 0 |
| Rabbi Trust | Level 3 | ||
| Balance in Rabbi Trust | ||
| Fair value of assets held in Rabbi Trust | 0 | 0 |
| Rabbi Trust | Cash equivalents | Level 1 | ||
| Balance in Rabbi Trust | ||
| Fair value of assets held in Rabbi Trust | 45 | 46 |
| Rabbi Trust | Cash equivalents | Level 2 | ||
| Balance in Rabbi Trust | ||
| Fair value of assets held in Rabbi Trust | 0 | 0 |
| Rabbi Trust | Cash equivalents | Level 3 | ||
| Balance in Rabbi Trust | ||
| Fair value of assets held in Rabbi Trust | 0 | 0 |
| Rabbi Trust | Fixed income fund | Level 1 | ||
| Balance in Rabbi Trust | ||
| Fair value of assets held in Rabbi Trust | 6,072 | 4,801 |
| Rabbi Trust | Fixed income fund | Level 2 | ||
| Balance in Rabbi Trust | ||
| Fair value of assets held in Rabbi Trust | 0 | 0 |
| Rabbi Trust | Fixed income fund | Level 3 | ||
| Balance in Rabbi Trust | ||
| Fair value of assets held in Rabbi Trust | 0 | 0 |
| Rabbi Trust | Equity securities | Level 1 | ||
| Balance in Rabbi Trust | ||
| Fair value of assets held in Rabbi Trust | 9,110 | 7,149 |
| Rabbi Trust | Equity securities | Level 2 | ||
| Balance in Rabbi Trust | ||
| Fair value of assets held in Rabbi Trust | 0 | 0 |
| Rabbi Trust | Equity securities | Level 3 | ||
| Balance in Rabbi Trust | ||
| Fair value of assets held in Rabbi Trust | 0 | 0 |
| Fair Value | Rabbi Trust | ||
| Balance in Rabbi Trust | ||
| Fair value of assets held in Rabbi Trust | 15,227 | 11,996 |
| Fair Value | Rabbi Trust | Cash equivalents | ||
| Balance in Rabbi Trust | ||
| Fair value of assets held in Rabbi Trust | 45 | 46 |
| Fair Value | Rabbi Trust | Fixed income fund | ||
| Balance in Rabbi Trust | ||
| Fair value of assets held in Rabbi Trust | 6,072 | 4,801 |
| Fair Value | Rabbi Trust | Equity securities | ||
| Balance in Rabbi Trust | ||
| Fair value of assets held in Rabbi Trust | $ 9,110 | $ 7,149 |
| X | ||||||||||
- Definition Represents the fair value of plan assets subject to claims of creditors. No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Employee Benefit Plans Employee Benefit Plans 13 (Details) - SERP - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Change in Benefit Obligation: | |||
| Projected benefit obligation at beginning of year | $ 20,783 | $ 16,317 | |
| Service cost | 930 | 799 | $ 814 |
| Interest cost | 893 | 743 | 653 |
| Actuarial (gain) loss | 1,872 | 3,341 | |
| Benefits/expenses paid | (416) | (417) | |
| Projected benefit obligation at end of year | 24,062 | 20,783 | $ 16,317 |
| Changes in Plan Assets: | |||
| Fair value of plan assets at beginning of year | 0 | ||
| Fair value of plan assets at end of year | 0 | 0 | |
| Funded Status: | |||
| Net amount recognized as accrued pension cost | $ (24,062) | $ (20,783) | |
| X | ||||||||||
- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
Employee Benefit Plans Employee Benefit Plans 14 (Details) - USD ($) $ in Thousands |
12 Months Ended | |||||
|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Amounts recognized on the balance sheets: | ||||||
| Non-current liabilities | $ (57,695) | $ (49,856) | ||||
| SERP | ||||||
| Amounts recognized on the balance sheets: | ||||||
| Current liabilities | (409) | (419) | ||||
| Non-current liabilities | (23,653) | (20,364) | ||||
| Net amount recognized | (24,062) | (20,783) | ||||
| Amounts recognized in regulatory assets consist of: | ||||||
| Prior service cost (credit) | 0 | 11 | ||||
| Net loss | 7,556 | 6,463 | ||||
| Regulatory assets (liabilities) | $ 6,474 | $ 3,452 | $ 3,452 | 7,556 | 6,474 | $ 3,452 |
| Unfunded accrued pension cost | 16,506 | 14,309 | ||||
| Net liability (asset) recognized | 24,062 | 20,783 | ||||
| Changes in plan assets and benefit obligations recognized in regulatory assets: | ||||||
| Regulatory asset at beginning of year | 6,474 | 3,452 | ||||
| Net (gain) loss | 1,872 | 3,339 | ||||
| Amortization of prior service (cost) credit | (12) | (25) | ||||
| Amortization of net gain (loss) | (778) | (292) | ||||
| Change in regulatory asset | 1,082 | 3,022 | ||||
| Regulatory asset (liability) at end of year | 7,556 | 6,474 | 3,452 | |||
| Net periodic pension costs | 2,612 | 1,859 | $ 2,015 | |||
| Change in regulatory asset | 1,082 | 3,022 | ||||
| Total recognized in net periodic pension cost and regulatory asset (liability) | 3,694 | 4,881 | ||||
| Estimated amounts that will be amortized from regulatory asset over the next fiscal year: | ||||||
| Initial net asset (obligation) | 0 | 0 | ||||
| Prior service cost | 0 | (11) | ||||
| Net gain (loss) | $ (1,049) | $ (777) | ||||
| Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: | ||||||
| Projected benefit obligation | 24,062 | 20,783 | $ 16,317 | |||
| Accumulated benefit obligation | 20,742 | 17,144 | ||||
| Fair value of plan assets | $ 0 | $ 0 | ||||
| Weighted-average assumptions used to determine benefit obligations at December 31: | ||||||
| Discount rate | 3.72% | 4.34% | ||||
| Rate of compensation increase | 4.00% | 4.00% | ||||
| X | ||||||||||
- Definition Represents the amortization of net losses that are recognized as a component of regulatory assets (liability). No definition available.
|
| X | ||||||||||
- Definition Represents the amounts related to initial net obligation expected to be recognized as components of regulatory asset over the next fiscal year that follows the most recent annual statement of financial position presented. No definition available.
|
| X | ||||||||||
- Definition Represents the net gains (losses) that are not recognized immediately and are expected to be recognized as components of regulatory asset over the next fiscal year that follows the most recent annual statement of financial position presented. No definition available.
|
| X | ||||||||||
- Definition Represents the prior service cost or credit expected to be recognized as components of regulatory asset over the next fiscal year that follows the most recent annual statement of financial position presented. No definition available.
|
| X | ||||||||||
- Definition Represents the amortization of prior service cost (credit) that are recognized as a component of regulatory assets (liability). No definition available.
|
| X | ||||||||||
- Definition Represents the net gains and losses recognized in regulatory asset (liability). No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition Represents the amount recognized in regulatory asset (liability). No definition available.
|
| X | ||||||||||
- Definition Represents the prior service cost (credit) recognized in regulatory asset (liability). No definition available.
|
| X | ||||||||||
- Definition Defined Benefit Plan, Amounts Recognized in Regulatory Assets (Liabilities), Net No definition available.
|
| X | ||||||||||
- Definition Represents the amount of unfunded accrued pension cost recognized in regulatory assets that is associated with the defined benefit pension plans and other post-retirement defined benefit plans. No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition Represents the net amount of loss (gain) that are recognized as a component of regulatory assets (liability). No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition Represents the net amount of loss (gain) that are recognized as a component of regulatory assets. No definition available.
|
| X | ||||||||||
- Definition Represents the amount recognized in net periodic pension cost and regulatory asset. No definition available.
|
| X | ||||||||||
- Definition Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of accumulated benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Fair value of plan assets for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
Employee Benefit Plans Employee Benefit Plans 15 (Details) - SERP - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Components of Net Periodic Benefits Cost: | |||
| Service cost | $ 930 | $ 799 | $ 814 |
| Interest cost | 893 | 743 | 653 |
| Amortization of prior service cost (credit) | 12 | 25 | 117 |
| Amortization of actuarial (gain) loss | 777 | 292 | 431 |
| Net periodic pension cost under accounting standards | $ 2,612 | $ 1,859 | $ 2,015 |
| Weighted-average assumptions used to determine net periodic cost: | |||
| Discount rate | 4.34% | 4.61% | 4.15% |
| Rate of compensation increase | 4.00% | 4.00% | 4.00% |
| X | ||||||||||
- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Details
|
Employee Benefit Plans Employee Benefit Plans 16 (Details) - SERP $ in Thousands |
Dec. 31, 2017
USD ($)
|
|---|---|
| Employee benefit plans | |
| 2018 | $ 409 |
| 2019 | 754 |
| 2020 | 1,278 |
| 2021 | 1,334 |
| 2022 | 1,326 |
| Thereafter | 7,276 |
| Total | $ 12,377 |
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of benefits for defined benefit plan expected to be paid in remainder of fiscal year. No definition available.
|
| X | ||||||||||
- Definition Amount of benefits for defined benefit plan expected to be paid in fifth fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of benefits for defined benefit plan expected to be paid in third fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of benefits for defined benefit plan expected to be paid in second fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
Employee Benefit Plans Employee Benefit Plans 17 (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Retirement Benefits [Abstract] | |||
| Employer's contribution | $ 2,300 | $ 2,200 | $ 2,100 |
| Employer discretionary contribution amount | $ 1,100 | $ 951 | $ 755 |
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of cost for defined contribution plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. No definition available.
|
Stock-Based Compensation Plans (Details) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2017
USD ($)
stock_plan
shares
|
Dec. 31, 2016
USD ($)
shares
|
Dec. 31, 2015
USD ($)
shares
|
|
| Stock compensation plans | |||
| Number of stock incentive plans | stock_plan | 5 | ||
| Stock-based compensation recognized in the income statement, before taxes | $ 2,885 | $ 2,538 | $ 2,754 |
| Tax benefits from exercise of stock-based awards | $ 0 | 581 | 877 |
| Immediate vesting for employees of certain age and above | 55 years | ||
| GSWC | |||
| Stock compensation plans | |||
| Stock-based compensation recognized in the income statement, before taxes | $ 2,420 | 2,118 | 2,443 |
| Capitalized equity-based compensation cost | 195 | 155 | 369 |
| Tax benefits from exercise of stock-based awards | 0 | 501 | 872 |
| Nonqualified stock options | |||
| Stock compensation plans | |||
| Tax benefits from exercise of stock-based awards | $ 1,000 | $ 581 | $ 877 |
| Granted (in shares) | shares | 0 | 0 | 0 |
| Nonqualified stock options | GSWC | |||
| Stock compensation plans | |||
| Tax benefits from exercise of stock-based awards | $ 1,000 | $ 501 | $ 872 |
| Restricted Stock Units | Employees and directors | |||
| Stock compensation plans | |||
| Stock-based compensation recognized in the income statement, before taxes | 2,885 | 2,538 | 2,754 |
| Restricted Stock Units | Employees and directors | GSWC | |||
| Stock compensation plans | |||
| Stock-based compensation recognized in the income statement, before taxes | $ 2,420 | $ 2,118 | $ 2,443 |
| Performance awards | |||
| Stock compensation plans | |||
| Vesting period | 3 years | ||
| 2000 and 2008 Employee Plans | Nonqualified stock options | |||
| Stock compensation plans | |||
| Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years | ||
| Vesting period | 3 years | ||
| Percentage of rights vesting in the first two years from the date of grant | 33.00% | ||
| Percentage of rights vesting in the third year from the date of grant | 34.00% | ||
| 2000 and 2008 Employee Plans | Restricted Stock Units | |||
| Stock compensation plans | |||
| Common stock entitled to be received under each award | shares | 1 | ||
| Percentage of rights vesting in the first two years from the date of grant | 33.00% | ||
| Percentage of rights vesting in the third year from the date of grant | 34.00% | ||
| 2000 and 2008 Employee Plans | Performance awards | |||
| Stock compensation plans | |||
| Vesting period | 3 years | ||
| Percentage of rights vesting in the first two years from the date of grant | 33.00% | ||
| Percentage of rights vesting in the third year from the date of grant | 34.00% | ||
| Weighted Average [Member] | |||
| Stock compensation plans | |||
| Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 1 year 6 months 30 days | ||
| Weighted Average [Member] | Restricted Stock Units | |||
| Stock compensation plans | |||
| Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 1 year 4 months 10 days | ||
| X | ||||||||||
- Definition Represents the number of stock incentive plans of the entity. No definition available.
|
| X | ||||||||||
- Definition Period in which 33% vesting rights is earned by awardeed of the grant, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
|
| X | ||||||||||
- Definition Represents the common stock entitled to be received under each share-based payment award. No definition available.
|
| X | ||||||||||
- Definition Share Based Compensation Arrangements by Share Based Payment Award Options, Minimum Age for Awards to Vest Immediately No definition available.
|
| X | ||||||||||
- Definition Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in the third year from the date of grant, thereby giving the employee the legal right to convert the award to shares, expressed as a percentage. No definition available.
|
| X | ||||||||||
- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Gross number of share options (or share units) granted during the period. No definition available.
|
| X | ||||||||||
- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Stock-Based Compensation Plans 2 (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Number of Options | |||
| Exercised (in shares) | (52,936) | (12,546) | (66,458) |
| Options outstanding at the end of the period (in shares) | 69,202 | ||
| Additional disclosure | |||
| Cash proceeds from the exercise of stock options | $ 909,000 | $ 235,000 | $ 1,198,000 |
| Tax benefit for the tax deduction from awards exercised | 0 | $ (581,000) | $ (877,000) |
| Unrecognized compensation cost | $ 1,059,000 | ||
| Maximum | |||
| Additional disclosure | |||
| Percentage of target amount of performance shares | 200.00% | ||
| Minimum | |||
| Additional disclosure | |||
| Percentage of target amount of performance shares | 0.00% | ||
| Weighted Average [Member] | |||
| Additional disclosure | |||
| Expected recognition period for unrecognized compensation cost | 1 year 6 months 30 days | ||
| Stock options | |||
| Number of Options | |||
| Options Outstanding at the beginning of the period (in shares) | 136,560 | ||
| Granted (in shares) | 0 | 0 | 0 |
| Exercised (in shares) | (52,936) | ||
| Forfeited or expired (in shares) | (14,422) | ||
| Options outstanding at the end of the period (in shares) | 69,202 | 136,560 | |
| Options exercisable at the end of the period (in shares) | 69,202 | ||
| Weighted Average Exercise Price | |||
| Options outstanding at the beginning of the period (in dollars per share) | $ 17.27 | ||
| Exercised (in dollars per share) | 17.18 | ||
| Forfeited or expired (in dollars per share) | 19.50 | ||
| Options outstanding at the end of the period (in dollars per share) | 16.87 | $ 17.27 | |
| Options exercisable at the end of the period (in dollars per share) | $ 16.87 | ||
| Additional disclosure | |||
| Weighted Average Remaining Contractual Term, Options outstanding | 1 year 4 months 6 days | ||
| Weighted Average Remaining Contractual Term, Options Exercisable | 1 year 4 months 6 days | ||
| Aggregate Intrinsic Value, Options outstanding | $ 1,167,405 | ||
| Aggregate Intrinsic Value, Options Exercisable | 1,167,405 | ||
| Total intrinsic value of options exercised | 1,718,000 | $ 308,000 | $ 1,457,000 |
| Tax benefit for the tax deduction from awards exercised | (1,000,000) | $ (581,000) | (877,000) |
| Restricted Stock Units | |||
| Additional disclosure | |||
| Unrecognized compensation cost related to performance awards | $ 824,000 | ||
| Number of Restricted/Performance Share Units | |||
| Restricted share units at the beginning of the period (in shares) | 107,729 | ||
| Granted (in shares) | 41,755 | ||
| Vested (in shares) | (40,695) | ||
| Forfeited (in shares) | (1,502) | ||
| Restricted share units at the end of the period (in shares) | 107,287 | 107,729 | |
| Weighted Average Grant-Date Value | |||
| Restricted share units at the beginning of the period (in dollars per share) | $ 30.83 | ||
| Granted (in dollars per share) | 44.46 | ||
| Vested (in dollars per share) | 39.32 | ||
| Forfeited (in dollars per share) | 42.32 | ||
| Restricted share units at the end of the period (in dollars per share) | $ 32.75 | $ 30.83 | |
| Restricted Stock Units | Weighted Average [Member] | |||
| Additional disclosure | |||
| Expected recognition period for unrecognized compensation cost | 1 year 4 months 10 days | ||
| Performance awards | |||
| Additional disclosure | |||
| Vesting period | 3 years | ||
| Period to meet the performance goals | 3 years | ||
| Number of Restricted/Performance Share Units | |||
| Restricted share units at the beginning of the period (in shares) | 102,203 | ||
| Granted (in shares) | 31,558 | ||
| Performance criteria adjustment (in shares) | 9,332 | ||
| Vested (in shares) | (45,214) | ||
| Restricted share units at the end of the period (in shares) | 97,879 | 102,203 | |
| Weighted Average Grant-Date Value | |||
| Restricted share units at the beginning of the period (in dollars per share) | $ 35.25 | ||
| Granted (in dollars per share) | 44.10 | ||
| Performance criteria adjustment (in dollars per share) | 43.40 | ||
| Vested (in dollars per share) | 29.60 | ||
| Restricted share units at the end of the period (in dollars per share) | $ 41.49 | $ 35.25 | |
| GSWC | |||
| Additional disclosure | |||
| Tax benefit for the tax deduction from awards exercised | $ 0 | $ (501,000) | (872,000) |
| GSWC | Stock options | |||
| Additional disclosure | |||
| Tax benefit for the tax deduction from awards exercised | $ (1,000,000) | $ (501,000) | $ (872,000) |
| X | ||||||||||
- Definition Percentage of Target Amount of Performance Shares No definition available.
|
| X | ||||||||||
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Criteria Adjustment No definition available.
|
| X | ||||||||||
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Criteria Adjustment, Weighted Average Grant Date Fair Value No definition available.
|
| X | ||||||||||
- Definition Unrecognized cost of unvested share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Weighted average price of options that were either forfeited or expired. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Gross number of share options (or share units) granted during the period. No definition available.
|
| X | ||||||||||
- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. No definition available.
|
| X | ||||||||||
- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Commitments 2 (Details) - GSWC - Water Supply $ in Thousands |
Dec. 31, 2017
USD ($)
|
|---|---|
| Estimated future minimum payments | |
| 2017 | $ 400 |
| 2018 | 400 |
| 2019 | 401 |
| 2020 | 400 |
| 2021 | 401 |
| Thereafter | 2,792 |
| Total | 4,794 |
| City of Claremont [Member] | |
| Purchase commitments | |
| Remaining amount of commitment | 2,400 |
| Various third parties | |
| Estimated future minimum payments | |
| Total | $ 2,400 |
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. No definition available.
|
| X | ||||||||||
- Definition Minimum amount of purchase arrangement maturing after the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. No definition available.
|
| X | ||||||||||
- Definition Minimum amount of purchase arrangement maturing in the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. No definition available.
|
| X | ||||||||||
- Definition Minimum amount of purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. No definition available.
|
| X | ||||||||||
- Definition Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. No definition available.
|
| X | ||||||||||
- Definition Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. No definition available.
|
| X | ||||||||||
- Definition Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Commitments 3 (Details) $ in Thousands |
Dec. 31, 2017
USD ($)
|
|---|---|
| Water Purchase Commitments [Member] | GSWC | |
| Purchase commitments | |
| Total commitment under agreement | $ 4,794 |
| Bear Valley Electric | Electric Service Utility Operations [Member] | |
| Purchase commitments | |
| Total commitment under agreement | $ 9,600 |
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Commitments 4 (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Operating Leases: | |||
| Consolidated rent expense | $ 2,448 | $ 2,298 | $ 2,740 |
| Future minimum payments under long-term non-cancelable operating leases | |||
| 2014 | 2,250 | ||
| 2015 | 1,934 | ||
| 2016 | 1,717 | ||
| 2017 | 819 | ||
| 2018 | 892 | ||
| Thereafter | 339 | ||
| Total | $ 7,951 | ||
| X | ||||||||||
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
Contingencies (Details) $ in Thousands |
3 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|
|
Jun. 08, 2017
USD ($)
connection
|
Dec. 31, 2017
USD ($)
|
Jun. 30, 2017
USD ($)
|
Dec. 31, 2017
USD ($)
customer
|
Dec. 31, 2016
USD ($)
|
Dec. 31, 2015
USD ($)
|
|
| Contingencies | ||||||
| Net utility plant | $ 1,204,992 | $ 1,204,992 | $ 1,150,926 | $ 1,060,794 | ||
| Gain (Loss) on Sale of Properties | $ 8,300 | |||||
| Proceeds from Sale of Other Assets | 34,300 | |||||
| Total Assets | 1,416,734 | 1,416,734 | 1,470,493 | |||
| Other Credits | (67,465) | (67,465) | (69,722) | |||
| Advances for construction | (123,602) | (123,602) | (120,518) | |||
| GSWC | ||||||
| Contingencies | ||||||
| Net utility plant | 1,197,940 | 1,197,940 | 1,145,311 | |||
| Gain (Loss) on Sale of Properties | $ 8,300 | |||||
| Total Assets | 1,326,823 | 1,326,823 | 1,384,178 | |||
| Other Credits | (67,465) | (67,465) | (69,722) | |||
| Advances for construction | (123,602) | (123,602) | (120,518) | |||
| Environmental Clean-Up and Remediation | GSWC | ||||||
| Contingencies | ||||||
| Amount spent in clean-up and remediation activities | 5,300 | |||||
| Amount paid by the State of California Underground Storage Tank Fund for clean-up and remediation of plant facilities | 1,500 | 1,500 | ||||
| Accrued liability for the estimated additional cost to complete the clean-up at the site | 1,300 | $ 1,300 | ||||
| City of Claremont [Member] | ||||||
| Contingencies | ||||||
| Litigation Settlement, Expense | 2,000 | |||||
| Legal Fees | 1,800 | |||||
| Litigation Settlement Interest | $ 200 | |||||
| Registration Payment Arrangement, Period | 12 years | |||||
| City of Claremont [Member] | GSWC | ||||||
| Contingencies | ||||||
| Litigation Settlement, Expense | $ 5,900 | |||||
| Number of customers served through water systems | customer | 11,000 | |||||
| Maximum | City of Claremont [Member] | ||||||
| Contingencies | ||||||
| Litigation Settlement, Expense | $ 7,600 | |||||
| Ojai Water System [Member] | ||||||
| Contingencies | ||||||
| Net utility plant | $ 22,256 | |||||
| Number of customers served through water systems | connection | 2,900 | |||||
| Accounts and Notes Receivable, Net | $ 721 | |||||
| Regulatory Assets | 3,944 | |||||
| Total Assets | 26,921 | |||||
| Other Credits | (366) | |||||
| Advances for construction | (532) | |||||
| Liabilities | $ (898) | |||||
| X | ||||||||||
- Definition Represents the amount of environmental remediation costs paid by the third party. No definition available.
|
| X | ||||||||||
- Definition Represents the number of customers served by the entity. No definition available.
|
| X | ||||||||||
- Definition Registration Payment Arrangement, Period No definition available.
|
| X | ||||||||||
- Definition Carrying amount as of the balance sheet date, net of allowance for doubtful accounts, of account and note receivables due from other than related parties. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Developers, builders, governmental agencies and municipalities will provide the entity with cash, or in some cases property, to extend its services to their properties. Nonrefundable contributions are recorded as contributions in aid of construction ("CIAC"). No definition available.
|
| X | ||||||||||
- Definition For utilities only, represents the carrying amount of the liability as of the balance sheet date for payments received by a utility from its customers in advance of performing its obligations under terms of its construction agreements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. No definition available.
|
| X | ||||||||||
- Definition Interest expense (income) directly attributable to an award in settlement of litigation. No definition available.
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Amount of cash inflow from the sale of other assets as part of operating activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Business Segments (Details) $ in Thousands |
3 Months Ended | 12 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2017
USD ($)
|
Sep. 30, 2017
USD ($)
|
Jun. 30, 2017
USD ($)
|
Mar. 31, 2017
USD ($)
|
Dec. 31, 2016
USD ($)
|
Sep. 30, 2016
USD ($)
|
Jun. 30, 2016
USD ($)
|
Mar. 31, 2016
USD ($)
|
Dec. 31, 2017
USD ($)
segment
|
Dec. 31, 2016
USD ($)
|
Dec. 31, 2015
USD ($)
|
||||
| Details of reportable segment | ||||||||||||||
| Operating revenues | $ 104,180 | $ 124,418 | $ 113,195 | $ 98,810 | $ 106,800 | $ 123,806 | $ 111,954 | $ 93,527 | $ 440,603 | $ 436,087 | $ 458,641 | |||
| Operating income (loss) | 21,955 | 38,567 | 41,816 | 24,738 | 22,092 | 39,617 | 31,774 | 21,233 | 127,076 | 114,716 | 118,489 | |||
| Interest expense, net | (20,792) | (21,235) | (20,630) | |||||||||||
| Net utility plant | 1,204,992 | 1,150,926 | 1,204,992 | 1,150,926 | 1,060,794 | |||||||||
| Depreciation and amortization expense | [1] | 39,031 | 38,850 | 42,033 | ||||||||||
| Income tax expense/(benefit) | 38,974 | 34,735 | 37,731 | |||||||||||
| Capital additions | $ 113,126 | 129,867 | 87,323 | |||||||||||
| AWR Parent | ||||||||||||||
| Details of reportable segment | ||||||||||||||
| Number of reportable segments | segment | 3 | |||||||||||||
| Operating revenues | $ 0 | 0 | 0 | |||||||||||
| Operating income (loss) | (96) | (19) | (11) | |||||||||||
| Interest expense, net | (248) | (134) | (46) | |||||||||||
| Net utility plant | 0 | 0 | 0 | 0 | 0 | |||||||||
| Depreciation and amortization expense | [1] | 0 | 0 | 0 | ||||||||||
| Income tax expense/(benefit) | (546) | (810) | ||||||||||||
| Capital additions | $ 0 | 0 | 0 | |||||||||||
| GSWC | ||||||||||||||
| Details of reportable segment | ||||||||||||||
| Number of reportable segments | segment | 2 | |||||||||||||
| Operating revenues | 75,136 | 99,913 | 88,346 | 76,906 | 74,295 | 98,763 | 88,759 | 76,885 | $ 340,301 | 338,702 | 364,550 | |||
| Operating income (loss) | 15,824 | $ 33,068 | $ 35,079 | $ 22,077 | 14,477 | $ 34,142 | $ 27,557 | $ 19,643 | 106,048 | 95,819 | 100,409 | |||
| Net utility plant | 1,197,940 | 1,145,311 | 1,197,940 | 1,145,311 | ||||||||||
| Depreciation and amortization expense | 37,852 | 37,804 | 40,893 | |||||||||||
| Income tax expense/(benefit) | 34,059 | 28,609 | 32,472 | |||||||||||
| GSWC | Water | ||||||||||||||
| Details of reportable segment | ||||||||||||||
| Operating revenues | 306,332 | 302,931 | 328,511 | |||||||||||
| Operating income (loss) | 98,797 | 87,911 | 94,213 | |||||||||||
| Interest expense, net | (18,909) | (19,696) | (19,468) | |||||||||||
| Net utility plant | 1,137,995 | 1,089,031 | 1,137,995 | 1,089,031 | 1,005,114 | |||||||||
| Depreciation and amortization expense | [1] | 35,706 | 35,777 | 39,190 | ||||||||||
| Income tax expense/(benefit) | 32,212 | 25,894 | 30,302 | |||||||||||
| Capital additions | 104,546 | 120,850 | 77,440 | |||||||||||
| GSWC | Electric | ||||||||||||||
| Details of reportable segment | ||||||||||||||
| Operating revenues | 33,969 | 35,771 | 36,039 | |||||||||||
| Operating income (loss) | 7,251 | 7,908 | 6,196 | |||||||||||
| Interest expense, net | (1,380) | (1,337) | (1,090) | |||||||||||
| Net utility plant | 59,945 | 56,280 | 59,945 | 56,280 | 51,002 | |||||||||
| Depreciation and amortization expense | [1] | 2,146 | 2,027 | 1,703 | ||||||||||
| Income tax expense/(benefit) | 1,847 | 2,715 | 2,170 | |||||||||||
| Capital additions | 5,941 | 7,063 | 8,704 | |||||||||||
| American States Utility Services [Member] | Military Utility Privatization Subsidiaries | ||||||||||||||
| Details of reportable segment | ||||||||||||||
| Operating revenues | 100,302 | 97,385 | 94,091 | |||||||||||
| Operating income (loss) | 21,124 | 18,916 | 18,091 | |||||||||||
| Interest expense, net | (255) | (68) | (26) | |||||||||||
| Net utility plant | $ 7,052 | $ 5,615 | 7,052 | 5,615 | 4,678 | |||||||||
| Depreciation and amortization expense | [1] | 1,179 | 1,046 | 1,140 | ||||||||||
| Income tax expense/(benefit) | 7,136 | 6,672 | 6,069 | |||||||||||
| Capital additions | $ 2,639 | $ 1,954 | $ 1,179 | |||||||||||
| ||||||||||||||
| X | ||||||||||
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The net amount of nonoperating interest income (expense). No definition available.
|
| X | ||||||||||
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. No definition available.
|
| X | ||||||||||
- Definition The net result for the period of deducting operating expenses from operating revenues. No definition available.
|
| X | ||||||||||
- Definition Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. No definition available.
|
| X | ||||||||||
- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Business Segments 2 (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Segment Reporting [Abstract] | |||
| Total utility plant | $ 1,204,992 | $ 1,150,926 | $ 1,060,794 |
| Other assets | 211,742 | 319,567 | |
| Total Assets | 1,416,734 | 1,470,493 | |
| AWR Parent | |||
| Segment Reporting [Abstract] | |||
| Total utility plant | 0 | 0 | 0 |
| Total Assets | 593,757 | 590,511 | |
| GSWC | |||
| Segment Reporting [Abstract] | |||
| Total utility plant | 1,197,940 | 1,145,311 | |
| Total Assets | 1,326,823 | 1,384,178 | |
| Segment Reporting Information [Line Items] | |||
| Depreciation on transportation equipment | 242 | 259 | 641 |
| American States Utility Services [Member] | American States Utility Services [Member] | |||
| Segment Reporting [Abstract] | |||
| Total utility plant | $ 7,052 | $ 5,615 | $ 4,678 |
| X | ||||||||||
- Definition Sum of the carrying amounts as of the balance sheet date of all assets except utility plant that are recognized. No definition available.
|
| X | ||||||||||
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of transportation equipment over the assets' useful lives. No definition available.
|
| X | ||||||||||
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands |
12 Months Ended | |||||
|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Changes in allowance for doubtful accounts | ||||||
| Balance at beginning of year | $ 764 | $ 944 | $ 892 | |||
| Provision charged to expense | 989 | 619 | 870 | |||
| Accounts written off, net of recoveries | 712 | 799 | 818 | |||
| Balance at end of year | 1,041 | 764 | 944 | |||
| Components of allowance for doubtful accounts | ||||||
| Allowance for doubtful accounts related to accounts receivable-customer | $ 806 | $ 702 | $ 790 | |||
| Allowance for doubtful accounts related to other accounts receivable | 235 | 62 | 154 | |||
| Total allowance for doubtful accounts | 764 | 944 | 892 | 1,041 | 764 | 944 |
| GSWC | ||||||
| Changes in allowance for doubtful accounts | ||||||
| Balance at beginning of year | 761 | 919 | 892 | |||
| Provision charged to expense | 816 | 627 | 845 | |||
| Accounts written off, net of recoveries | 712 | 785 | 818 | |||
| Balance at end of year | 865 | 761 | 919 | |||
| Components of allowance for doubtful accounts | ||||||
| Allowance for doubtful accounts related to accounts receivable-customer | 806 | 702 | 790 | |||
| Allowance for doubtful accounts related to other accounts receivable | 59 | 59 | 129 | |||
| Total allowance for doubtful accounts | $ 761 | $ 919 | $ 892 | $ 865 | $ 761 | $ 919 |
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition Represents the amount of direct write-downs of receivables, net of recoveries, charged against the allowance for doubtful accounts. No definition available.
|
| X | ||||||||||
- Definition Represents the provision for doubtful accounts related to other accounts receivable. No definition available.
|
| X | ||||||||||
- Definition Represents the provision for doubtful accounts related to accounts receivable from customers. No definition available.
|
| X | ||||||||||
- Definition Amount of the current period expense charged against continuing operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected). No definition available.
|
| X | ||||||||||
- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- Details
|
Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Taxes and Interest Paid: | |||
| Income taxes paid | $ 13,615 | $ 10,916 | $ 14,817 |
| Interest paid | 22,762 | 22,305 | 21,822 |
| Non-Cash Transactions: | |||
| Accrued payables for investment in utility plant | 20,131 | 17,236 | 20,655 |
| Property installed by developers and conveyed | 2,082 | 5,395 | 3,284 |
| GSWC | |||
| Taxes and Interest Paid: | |||
| Income taxes paid | 4,822 | 8,437 | 1,541 |
| Interest paid | 22,282 | 22,078 | 21,797 |
| Non-Cash Transactions: | |||
| Accrued payables for investment in utility plant | 20,128 | 17,207 | 20,655 |
| Property installed by developers and conveyed | $ 2,082 | $ 5,395 | $ 3,284 |
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Value of property contributed in noncash investing and financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT (Details) - USD ($) |
3 Months Ended | 12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Condensed balance sheet | ||||||||||||
| Net Income (Loss) Attributable to Parent | $ 12,868,000 | $ 21,006,000 | $ 22,792,000 | $ 12,701,000 | $ 11,212,000 | $ 21,639,000 | $ 16,742,000 | $ 10,150,000 | $ 69,367,000 | $ 59,743,000 | $ 60,484,000 | |
| Assets | ||||||||||||
| Cash and equivalents | 214,000 | 436,000 | 214,000 | 436,000 | 4,364,000 | |||||||
| Income taxes receivable and other receivables | 4,737,000 | 17,867,000 | 4,737,000 | 17,867,000 | ||||||||
| Total current assets | 155,463,000 | 166,875,000 | 155,463,000 | 166,875,000 | ||||||||
| Other assets | 5,667,000 | 5,068,000 | 5,667,000 | 5,068,000 | ||||||||
| Total Assets | 1,416,734,000 | 1,470,493,000 | 1,416,734,000 | 1,470,493,000 | ||||||||
| Liabilities and Capitalization | ||||||||||||
| Notes payable to bank | 59,000,000 | 90,000,000 | 59,000,000 | 90,000,000 | ||||||||
| Income taxes payable | 225,000 | 149,000 | 225,000 | 149,000 | ||||||||
| Other Liabilities, Current | 15,109,000 | 11,297,000 | 15,109,000 | 11,297,000 | ||||||||
| Other | 156,662,000 | 177,944,000 | 156,662,000 | 177,944,000 | ||||||||
| Deferred taxes | 115,703,000 | 224,530,000 | 115,703,000 | 224,530,000 | ||||||||
| Other | 409,088,000 | 477,271,000 | 409,088,000 | 477,271,000 | ||||||||
| Common shareholders' equity | 529,945,000 | 494,297,000 | 529,945,000 | 494,297,000 | 465,945,000 | $ 506,801,000 | ||||||
| Total Capitalization and Liabilities | 1,416,734,000 | 1,470,493,000 | 1,416,734,000 | 1,470,493,000 | ||||||||
| Total capitalization | 850,984,000 | 815,278,000 | 850,984,000 | 815,278,000 | ||||||||
| AWR | ||||||||||||
| Condensed balance sheet | ||||||||||||
| Net Income (Loss) Attributable to Parent | 69,367,000 | 59,743,000 | 60,484,000 | |||||||||
| Assets | ||||||||||||
| Cash and equivalents | 48,000 | 32,000 | 48,000 | 32,000 | ||||||||
| Inter-company loan receivables | 45,955,000 | 76,931,000 | 45,955,000 | 76,931,000 | ||||||||
| Total current assets | 46,003,000 | 76,963,000 | 46,003,000 | 76,963,000 | ||||||||
| Investments in subsidiaries | 539,332,000 | 506,584,000 | 539,332,000 | 506,584,000 | ||||||||
| Other assets | 8,422,000 | 6,964,000 | 8,422,000 | 6,964,000 | ||||||||
| Total Assets | 593,757,000 | 590,511,000 | 593,757,000 | 590,511,000 | ||||||||
| Liabilities and Capitalization | ||||||||||||
| Notes payable to bank | 59,000,000 | 90,000,000 | 59,000,000 | 90,000,000 | ||||||||
| Income taxes payable | 2,780,000 | 4,043,000 | 2,780,000 | 4,043,000 | ||||||||
| Inter-company payable to Parent | 73,000 | 0 | 73,000 | 0 | ||||||||
| Other Liabilities, Current | 509,000 | 517,000 | 509,000 | 517,000 | ||||||||
| Other | 62,362,000 | 94,560,000 | 62,362,000 | 94,560,000 | ||||||||
| Other | 1,450,000 | 1,654,000 | 1,450,000 | 1,654,000 | ||||||||
| Income taxes payable and other liabilities | 1,450,000 | 1,654,000 | 1,450,000 | 1,654,000 | ||||||||
| Common shareholders' equity | 529,945,000 | 494,297,000 | 529,945,000 | 494,297,000 | ||||||||
| Total Capitalization and Liabilities | 593,757,000 | 590,511,000 | 593,757,000 | 590,511,000 | ||||||||
| Total capitalization | 529,945,000 | 494,297,000 | 529,945,000 | 494,297,000 | ||||||||
| Golden State Water Company [Member] | ||||||||||||
| Condensed balance sheet | ||||||||||||
| Net Income (Loss) Attributable to Parent | 7,309,000 | $ 17,336,000 | $ 18,363,000 | $ 10,749,000 | 6,432,000 | $ 17,883,000 | $ 13,670,000 | $ 8,984,000 | 53,757,000 | 46,969,000 | 47,591,000 | |
| Assets | ||||||||||||
| Cash and equivalents | 214,000 | 209,000 | 214,000 | 209,000 | ||||||||
| Income taxes receivable and other receivables | 6,590,000 | 21,856,000 | 6,590,000 | 21,856,000 | ||||||||
| Total current assets | 101,244,000 | 112,257,000 | 101,244,000 | 112,257,000 | ||||||||
| Other assets | 5,683,000 | 4,906,000 | 5,683,000 | 4,906,000 | ||||||||
| Total Assets | 1,326,823,000 | 1,384,178,000 | 1,326,823,000 | 1,384,178,000 | ||||||||
| Liabilities and Capitalization | ||||||||||||
| Inter-company payable to Parent | 34,836,000 | 61,726,000 | 34,836,000 | 61,726,000 | ||||||||
| Other Liabilities, Current | 14,705,000 | 10,925,000 | 14,705,000 | 10,925,000 | ||||||||
| Other | 117,334,000 | 135,971,000 | 117,334,000 | 135,971,000 | ||||||||
| Deferred taxes | 120,780,000 | 227,798,000 | 120,780,000 | 227,798,000 | ||||||||
| Other | 414,076,000 | 480,456,000 | 414,076,000 | 480,456,000 | ||||||||
| Common shareholders' equity | 474,374,000 | 446,770,000 | 474,374,000 | 446,770,000 | $ 423,730,000 | $ 435,190,000 | ||||||
| Total Capitalization and Liabilities | 1,326,823,000 | 1,384,178,000 | 1,326,823,000 | 1,384,178,000 | ||||||||
| Total capitalization | 795,413,000 | 767,751,000 | 795,413,000 | 767,751,000 | ||||||||
| Notes Payable, Other Payables [Member] | Notes Receivable | Golden State Water Company [Member] | ||||||||||||
| Assets | ||||||||||||
| Notes Receivable, Related Parties, Current | $ 0 | $ 0 | $ 0 | $ 0 | ||||||||
| Syndicated Revolving Credit Facility [Member] | AWR | ||||||||||||
| Condensed balance sheet | ||||||||||||
| Total funded debt ratio | 42.00% | |||||||||||
| Minimum [Member] | Syndicated Revolving Credit Facility [Member] | AWR | ||||||||||||
| Condensed balance sheet | ||||||||||||
| Total funded debt ratio | 65.00% | |||||||||||
| Maximum | Syndicated Revolving Credit Facility [Member] | ||||||||||||
| Condensed balance sheet | ||||||||||||
| Total funded debt ratio | 65.00% | |||||||||||
| Maximum | Syndicated Revolving Credit Facility [Member] | AWR | ||||||||||||
| Condensed balance sheet | ||||||||||||
| Total funded debt ratio | 100.00% | |||||||||||
| X | ||||||||||
- Definition The noncurrent portion of tax liabilities and also includes the aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. No definition available.
|
| X | ||||||||||
- Definition Represents the funded debt ratio required to be maintained for debt instrument. No definition available.
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| X | ||||||||||
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition This element represents the total consolidated (as applicable) capitalization of the entity which is comprised of its long-term debt and equity instruments. The table may be detailed by subsidiary (legal entity) and include information by type of debt or equity detailed by instrument. No definition available.
|
| X | ||||||||||
- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Aggregated carrying amounts of obligations as of the balance sheet date, excluding long-term debt, incurred as part of the normal operations that are expected to be paid after one year or beyond the normal operating cycle, if longer. Alternate captions include Total Deferred Credits and Other Liabilities. No definition available.
|
| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Current portion of the total carrying amount as of the balance sheet date due within one year or the operating cycle, if longer, on all notes payable to banks paid on an installment with long term maturities. This can include the amount of any loans from the applicant firm. This does not, however, include any mortgage balances. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amounts due from parties associated with the reporting entity as evidenced by a written promise to pay, due within 1 year (or 1 business cycle). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of noncurrent assets classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
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| X | ||||||||||
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| X | ||||||||||
- Details
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| X | ||||||||||
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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 2 (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Condensed financial statements | |||||||||||
| Income before income tax expense | $ 108,341 | $ 94,478 | $ 98,215 | ||||||||
| Net Income | $ 12,868 | $ 21,006 | $ 22,792 | $ 12,701 | $ 11,212 | $ 21,639 | $ 16,742 | $ 10,150 | $ 69,367 | $ 59,743 | $ 60,484 |
| Weighted Average Number of Shares Outstanding (in shares) | 36,638 | 36,552 | 37,389 | ||||||||
| Basic Earnings Per Common Share (in dollars per share) | $ (1.88) | $ (1.63) | $ (1.61) | ||||||||
| Weighted Average Number of Diluted Common Shares Outstanding | 36,844 | 36,750 | 37,614 | ||||||||
| Fully Diluted Earnings per Common Share (in dollars per share) | $ 1.88 | $ 1.62 | $ 1.60 | ||||||||
| Dividends Declared Per Common Share (in dollars per share) | $ 0.994 | $ 0.914 | $ 0.874 | ||||||||
| AWR | |||||||||||
| Condensed financial statements | |||||||||||
| Operating revenues and other income | $ 0 | $ 71 | $ 98 | ||||||||
| Operating Expenses and Other Expenses | 344 | 19 | 11 | ||||||||
| Operating income / (loss) | (344) | 52 | 87 | ||||||||
| Equity in earnings of subsidiaries | 67,490 | 59,145 | 59,587 | ||||||||
| Income before income tax expense | 67,146 | 59,197 | 59,674 | ||||||||
| Income tax expense (benefit) | (2,221) | (546) | (810) | ||||||||
| Net Income | $ 69,367 | $ 59,743 | $ 60,484 | ||||||||
| X | ||||||||||
- Definition Represents the sum of current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations. No definition available.
|
| X | ||||||||||
- Definition Operating Expenses and Other Expenses No definition available.
|
| X | ||||||||||
- Definition The net result for the period of deducting operating expenses from operating revenues and other income. No definition available.
|
| X | ||||||||||
- Definition Represents information pertaining to operating revenues and other income. No definition available.
|
| X | ||||||||||
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Details
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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 3 (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Cash Flows From Financing Activities: | |||
| Payments for Repurchase of Common Stock | $ 0 | $ 0 | $ (72,893) |
| Proceeds from stock option exercises | 909 | 235 | 1,198 |
| Net change in notes payable to banks | (31,000) | 62,000 | 28,000 |
| Dividends paid | (36,417) | (33,408) | (32,690) |
| Proceeds from (Payments for) Other Financing Activities | (1,292) | (1,490) | (957) |
| Net increase (decrease) in cash and cash equivalents | (222) | (3,928) | (71,624) |
| Cash and cash equivalents, beginning of year | 436 | 4,364 | 75,988 |
| Cash and cash equivalents, end of year | 214 | 436 | 4,364 |
| AWR | |||
| Condensed financial statements | |||
| Cash Flows From Operating Activities | 36,024 | 34,878 | 57,682 |
| Cash Flows From Investing Activities: | |||
| Loans (made to)/repaid from, wholly-owned subsidiaries | 30,500 | (64,500) | (12,000) |
| Net cash used | 30,500 | (64,500) | (12,000) |
| Cash Flows From Financing Activities: | |||
| Payments for Repurchase of Common Stock | 0 | 0 | (72,893) |
| Proceeds from note payable to GSWC | 0 | 0 | 20,700 |
| Repayment of note payable to GSWC | 0 | 0 | (20,700) |
| Proceeds from stock option exercises | 909 | 235 | 1,198 |
| Net change in notes payable to banks | (31,000) | 62,000 | 28,000 |
| Dividends paid | (36,417) | (33,408) | (32,690) |
| Proceeds from (Payments for) Other Financing Activities | 0 | (9) | (90) |
| Net cash provided (used) | (66,508) | 28,818 | (76,475) |
| Net increase (decrease) in cash and cash equivalents | 16 | (804) | (30,793) |
| Cash and cash equivalents, beginning of year | 32 | 836 | 31,629 |
| Cash and cash equivalents, end of year | $ 48 | $ 32 | $ 836 |
| X | ||||||||||
- Definition The net change during the reporting period in amount of notes payable to banks, excluding mortgage notes, initially due beyond one year or beyond the operating cycle if longer. No definition available.
|
| X | ||||||||||
- Definition For the entity and the disposal group, cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. No definition available.
|
| X | ||||||||||
- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The cash outflow to reacquire common stock during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The cash inflow or outflow associated with long-term loans for related parties where one party can exercise control or significant influence over another party, including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from (Payments for) Advances to Affiliates. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of cash inflow (outflow) from financing activities classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The cash inflow from a long-term borrowing made from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from Advances from Affiliates. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The cash outflow for the payment of a long-term borrowing made from a related party where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Payments for Advances from Affiliates. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 4 (Details) - USD ($) |
12 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Oct. 31, 2015 |
Oct. 27, 2015 |
|
| Short-term borrowing activities (excluding letters of credit) | |||||
| Balance outstanding at the end of the period | $ 59,000,000 | $ 90,000,000 | |||
| Short-term borrowing (excluding letters of credit) | |||||
| Short-term borrowing activities (excluding letters of credit) | |||||
| Balance outstanding at the end of the period | $ 59,000,000 | $ 90,000,000 | |||
| Interest Rate at the end of the period (as a percent) | 2.28% | 1.46% | |||
| Average Amount Outstanding | $ 65,242,000 | $ 59,261,000 | |||
| Weighted Average Annual Interest Rate (as a percent) | 1.69% | 1.20% | |||
| Maximum Amount Outstanding | $ 102,500,000 | $ 96,000,000 | |||
| Syndicated revolving credit facility | |||||
| Note payable to banks | |||||
| Variable rate basis | Euro rate | ||||
| Syndicated revolving credit facility | Minimum | |||||
| Short-term borrowing activities (excluding letters of credit) | |||||
| Interest coverage ratio | 325.00% | ||||
| Syndicated revolving credit facility | Maximum | |||||
| Short-term borrowing activities (excluding letters of credit) | |||||
| Total funded debt ratio | 65.00% | ||||
| Syndicated revolving credit facility | Letter of Credit Irrevocable Franchise Agreement with City of Rancho Cordova [Member] | |||||
| Note payable to banks | |||||
| Letter of credit, amount | $ 15,000,000 | ||||
| AWR | |||||
| Note payable to banks | |||||
| Maximum borrowing capacity | 150,000,000 | ||||
| Short-term borrowing activities (excluding letters of credit) | |||||
| Balance outstanding at the end of the period | $ 59,000,000 | 90,000,000 | |||
| AWR | Syndicated revolving credit facility | |||||
| Short-term borrowing activities (excluding letters of credit) | |||||
| Interest coverage ratio | 754.00% | ||||
| Total funded debt ratio | 42.00% | ||||
| AWR | Syndicated revolving credit facility | Minimum | |||||
| Short-term borrowing activities (excluding letters of credit) | |||||
| Interest coverage ratio | 325.00% | ||||
| Total funded debt ratio | 65.00% | ||||
| AWR | Syndicated revolving credit facility | Maximum | |||||
| Short-term borrowing activities (excluding letters of credit) | |||||
| Total funded debt ratio | 100.00% | ||||
| AWR | Syndicated revolving credit facility | Letters of credit | |||||
| Note payable to banks | |||||
| Maximum borrowing capacity | $ 25,000,000 | ||||
| Letter of credit, amount | $ 6,300,000 | ||||
| Letter of credit fee (as a percent) | 0.65% | ||||
| AWR | Syndicated revolving credit facility | Letter of Credit - GSWC business automobile insurance policy | |||||
| Note payable to banks | |||||
| Letter of credit, amount | $ 340,000 | ||||
| AWR | Syndicated revolving credit facility | Letter of Credit - American Recovery and Reinvestment Act | |||||
| Note payable to banks | |||||
| Letter of credit, amount | 5,400,000 | ||||
| AWR | Syndicated revolving credit facility | Letter of Credit - Purchase of power | |||||
| Note payable to banks | |||||
| Letter of credit, amount | 585,000,000 | ||||
| Subsidiaries [Member] | |||||
| Short-term borrowing activities (excluding letters of credit) | |||||
| Dividends paid | (36,500,000) | (33,800,000) | $ (62,000,000) | ||
| GSWC | |||||
| Short-term borrowing activities (excluding letters of credit) | |||||
| Dividends paid | (27,680,000) | (25,450,000) | $ (62,000,000) | ||
| Syndicated revolving credit facility | Syndicated revolving credit facility | |||||
| Note payable to banks | |||||
| Maximum borrowing capacity | 150,000,000 | ||||
| Syndicated revolving credit facility | AWR | Syndicated revolving credit facility | |||||
| Note payable to banks | |||||
| Maximum borrowing capacity | 150,000,000 | ||||
| Notes Payable, Other Payables [Member] | GSWC | |||||
| Short-term borrowing activities (excluding letters of credit) | |||||
| Debt Instrument, Face Amount | $ 40,000,000 | $ 40,000,000 | |||
| Debt Instrument, Maximum Borrowing Capacity | 40,000,000 | 40,000,000 | |||
| Notes Payable, Other Payables [Member] | American States Utility Services [Member] | |||||
| Short-term borrowing activities (excluding letters of credit) | |||||
| Debt Instrument, Face Amount | 10,000,000 | 10,000,000 | |||
| Debt Instrument, Maximum Borrowing Capacity | $ 10,000,000 | $ 10,000,000 | |||
| Notes Receivable | Notes Payable, Other Payables [Member] | GSWC | |||||
| Short-term borrowing activities (excluding letters of credit) | |||||
| Notes Receivable, Related Parties, Current | $ 0 | $ 0 | |||
| X | ||||||||||
- Definition Represents the funded debt ratio required to be maintained for debt instrument. No definition available.
|
| X | ||||||||||
- Definition Represents the interest coverage ratio required to be maintained for debt instrument. No definition available.
|
| X | ||||||||||
- Definition Debt Instrument, Maximum Borrowing Capacity No definition available.
|
| X | ||||||||||
- Definition Cash outflow from subsidiaries in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. No definition available.
|
| X | ||||||||||
- Definition -- None. No documentation exists for this element. -- No definition available.
|
| X | ||||||||||
- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. No definition available.
|
| X | ||||||||||
- Definition Face (par) amount of debt instrument at time of issuance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. No definition available.
|
| X | ||||||||||
- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. No definition available.
|
| X | ||||||||||
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Current portion of the total carrying amount as of the balance sheet date due within one year or the operating cycle, if longer, on all notes payable to banks paid on an installment with long term maturities. This can include the amount of any loans from the applicant firm. This does not, however, include any mortgage balances. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amounts due from parties associated with the reporting entity as evidenced by a written promise to pay, due within 1 year (or 1 business cycle). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Weighted average interest rate of short-term debt outstanding calculated at point in time. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period. No definition available.
|
| X | ||||||||||
- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, the maximum amount borrowed at any time during the period. No definition available.
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| X | ||||||||||
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| X | ||||||||||
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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 08, 2017 |
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Operating revenues | $ 104,180 | $ 124,418 | $ 113,195 | $ 98,810 | $ 106,800 | $ 123,806 | $ 111,954 | $ 93,527 | $ 440,603 | $ 436,087 | $ 458,641 | |
| Operating income (loss) | 21,955 | 38,567 | 41,816 | 24,738 | 22,092 | 39,617 | 31,774 | 21,233 | 127,076 | 114,716 | 118,489 | |
| Net Income | $ 12,868 | $ 21,006 | $ 22,792 | $ 12,701 | $ 11,212 | $ 21,639 | $ 16,742 | $ 10,150 | $ 69,367 | $ 59,743 | $ 60,484 | |
| Basic earnings (in dollars per share) | $ 0.35 | $ 0.57 | $ 0.62 | $ 0.35 | $ 0.30 | $ 0.59 | $ 0.46 | $ 0.28 | $ 1.88 | $ 1.63 | $ 1.61 | |
| Diluted earnings (in dollars per share) | $ 0.35 | $ 0.57 | $ 0.62 | $ 0.34 | $ 0.30 | $ 0.59 | $ 0.45 | $ 0.28 | $ 1.88 | $ 1.62 | $ 1.60 | |
| Gain on sale of properties | $ 8,300 | |||||||||||
| GSWC | ||||||||||||
| Operating revenues | $ 75,136 | $ 99,913 | $ 88,346 | $ 76,906 | $ 74,295 | $ 98,763 | $ 88,759 | $ 76,885 | $ 340,301 | $ 338,702 | $ 364,550 | |
| Operating income (loss) | 15,824 | 33,068 | 35,079 | 22,077 | 14,477 | 34,142 | 27,557 | 19,643 | 106,048 | 95,819 | 100,409 | |
| Net Income | 7,309 | $ 17,336 | 18,363 | $ 10,749 | 6,432 | $ 17,883 | $ 13,670 | $ 8,984 | $ 53,757 | $ 46,969 | $ 47,591 | |
| Gain on sale of properties | 8,300 | |||||||||||
| Cash received for reimbursement of legal and other defense costs | $ (1,800) | |||||||||||
| Restatement Adjustment | GSWC | ||||||||||||
| Operating revenues | 5,200 | |||||||||||
| Restatement Adjustment | American States Utility Services [Member] | ||||||||||||
| Operating revenues | $ 1,000 | $ 1,700 | ||||||||||
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The net result for the period of deducting operating expenses from operating revenues. No definition available.
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- Definition Cash received for the settlement of litigation during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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