Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2018	Nov. 02, 2018
Document and Entity Information
Entity Registrant Name	AMERICAN STATES WATER CO
Entity Central Index Key	0001056903
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		36,745,039
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment
Regulated utility plant, at cost	$ 1,795,500	$ 1,722,421
Non-utility property, at cost	23,759	15,941
Utility plant, at cost	1,819,259	1,738,362
Less - Accumulated depreciation	(556,344)	(533,370)
Net property, plant and equipment	1,262,915	1,204,992
Other Property and Investments
Goodwill	1,116	1,116
Other property and investments	26,386	24,070
Total other property and investments	27,502	25,186
Current Assets
Cash and cash equivalents	1,976	214
Accounts receivable - customers, less allowance for doubtful accounts	29,915	26,127
Unbilled receivable	25,215	26,411
Receivable from the U.S. government	21,095	3,725
Other accounts receivable, less allowance for doubtful accounts	2,411	8,251
Income taxes receivable	730	4,737
Materials and supplies, at average cost	5,622	4,795
Regulatory assets — current	22,130	34,220
Prepayments and other current assets	6,915	5,596
Contract with Customer, Asset, Gross, Current	18,889	0
Costs and estimated earnings in excess of billings on contracts (Note 2)	0	41,387
Total current assets	134,898	155,463
Regulatory and Other Assets
Account Receivable from US Government, Net,Noncurrent	33,873	0
Contract with Customer, Asset, Gross, Noncurrent	154	0
Costs and estimated earnings in excess of billings on contracts (Note 2)	0	25,426
Other	5,700	5,667
Total regulatory and other assets	39,727	31,093
Total Assets	1,465,042	1,416,734
Capitalization
Outstanding: 36,745,039 shares in 2018 and 36,680,794 shares in 2017	253,251	250,124
Earnings reinvested in the business	300,910	279,821
Total common shareholders’ equity	554,161	529,945
Long-term debt	281,010	321,039
Total capitalization	835,171	850,984
Current Liabilities
Notes payable to bank	0	59,000
Long-term debt — current	40,320	324
Accounts payable	50,448	50,978
Income taxes payable	1,049	225
Accrued other taxes	10,311	7,344
Accrued employee expenses	11,633	12,969
Accrued interest	6,560	3,861
Unrealized loss on derivative contracts	1,143	2,941
Contract liabilities (Note 2)	8,942	3,911
Other	12,780	15,109
Total current liabilities	143,186	156,662
Other Credits
Notes Payable to Bank, Noncurrent	70,000	0
Advances for construction	67,467	67,465
Contributions in aid of construction — net	123,686	123,602
Deferred income taxes	114,925	115,703
Regulatory Liability, Noncurrent	43,766	32,178
Unamortized investment tax credits	1,384	1,436
Accrued pension and other postretirement benefits	54,239	57,695
Other	11,218	11,009
Total other credits	486,685	409,088
Commitments and Contingencies
Total Capitalization and Liabilities	1,465,042	1,416,734
Golden State Water Company
Property, Plant and Equipment
Utility plant, at cost	1,795,500	1,722,421
Less - Accumulated depreciation	(546,310)	(524,481)
Net property, plant and equipment	1,249,190	1,197,940
Other Property and Investments
Total other property and investments	24,290	21,956
Current Assets
Cash and cash equivalents	153	214
Accounts receivable - customers, less allowance for doubtful accounts	29,915	26,127
Unbilled receivable	19,987	18,852
Other accounts receivable, less allowance for doubtful accounts	1,350	6,105
Income taxes receivable from Parent	1,559	6,590
Materials and supplies, at average cost	4,674	4,046
Regulatory assets — current	22,130	34,220
Prepayments and other current assets	5,796	5,090
Total current assets	85,564	101,244
Regulatory and Other Assets
Other	5,685	5,683
Total regulatory and other assets	5,685	5,683
Total Assets	1,364,729	1,326,823
Capitalization
Outstanding: 36,745,039 shares in 2018 and 36,680,794 shares in 2017	244,716	242,181
Earnings reinvested in the business	243,660	232,193
Total common shareholders’ equity	488,376	474,374
Long-term debt	281,010	321,039
Total capitalization	769,386	795,413
Current Liabilities
Intercompany payable	50,475	34,836
Long-term debt — current	40,320	324
Accounts payable	44,798	42,497
Accrued other taxes	10,197	7,108
Accrued employee expenses	10,046	11,338
Accrued interest	6,298	3,585
Unrealized loss on derivative contracts	1,143	2,941
Other	11,469	14,705
Total current liabilities	174,746	117,334
Other Credits
Advances for construction	67,467	67,465
Contributions in aid of construction — net	123,686	123,602
Deferred income taxes	118,935	120,780
Regulatory Liability, Noncurrent	43,766	32,178
Unamortized investment tax credits	1,384	1,436
Accrued pension and other postretirement benefits	54,239	57,695
Other	11,120	10,920
Total other credits	420,597	414,076
Commitments and Contingencies
Total Capitalization and Liabilities	$ 1,364,729	$ 1,326,823

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Common Stock, Shares Authorized	60,000,000	60,000,000
Accounts receivable - customers, allowance for doubtful accounts	$ 844	$ 806
Other accounts receivable, allowance for doubtful accounts	$ 59	$ 235
Common Stock, Shares, Outstanding	36,745,039	36,680,794
Golden State Water Company
Common Stock, Shares Authorized	1,000	1,000
Accounts receivable - customers, allowance for doubtful accounts	$ 844	$ 806
Other accounts receivable, allowance for doubtful accounts	$ 59	$ 59
Common Stock, Shares, Outstanding	146	146

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating Revenues
Water	$ 87,689	$ 91,919	$ 228,834	$ 239,057
Electric Revenue	7,875	7,994	25,548	26,108
Contracted services	28,618	24,505	71,429	71,258
Revenues	124,182	124,418	325,811	336,423
Operating Expenses
Water purchased	21,842	20,576	52,057	50,619
Power purchased for pumping	3,217	2,913	7,141	6,667
Groundwater production assessment	5,961	5,870	15,146	14,176
Utilities Operating Expense, Purchased Power	2,647	2,439	8,439	7,847
Supply cost balancing accounts	(5,212)	(4,621)	(11,110)	(11,663)
Other operation	8,355	7,657	24,125	21,989
Administrative and general	21,570	21,823	62,076	62,519
Depreciation and amortization	10,118	9,854	29,794	29,184
Maintenance	3,422	3,222	10,921	10,292
Property and other taxes	4,692	4,475	13,863	13,386
ASUS construction	13,620	11,693	35,168	34,589
Gain on sale of assets	(25)	(17)	(43)	(8,318)
Total operating expenses	90,207	85,884	247,577	231,287
Operating Income	33,975	38,534	78,234	105,136
Other Income and Expenses
Interest expense	(5,948)	(5,775)	(17,919)	(17,606)
Interest income	641	321	1,813	1,200
Other, net	1,223	434	1,844	1,439
Total other income and expenses	(4,084)	(5,020)	(14,262)	(14,967)
Income from operations before income tax expense	29,891	33,514	63,972	90,169
Income tax expense	6,939	12,508	13,890	33,670
Net Income	$ 22,952	$ 21,006	$ 50,082	$ 56,499
Weighted Average Number of Shares Outstanding, Basic	36,737	36,659	36,728	36,625
Basic Earnings Per Common Share (in dollars per share)	$ 0.62	$ 0.57	$ 1.36	$ 1.53
Weighted Average Number of Diluted Shares (in shares)	36,950	36,856	36,935	36,813
Fully Diluted Earnings Per Common Share (in dollars per share)	$ 0.62	$ 0.57	$ 1.35	$ 1.53
Dividends Paid Per Common Share (in dollars per share)	$ 0.275	$ 0.255	$ 0.785	$ 0.739
Golden State Water Company
Operating Revenues
Water	$ 87,689	$ 91,919	$ 228,834	$ 239,057
Electric Revenue	7,875	7,994	25,548	26,108
Revenues	95,564	99,913	254,382	265,165
Operating Expenses
Water purchased	21,842	20,576	52,057	50,619
Power purchased for pumping	3,217	2,913	7,141	6,667
Groundwater production assessment	5,961	5,870	15,146	14,176
Utilities Operating Expense, Purchased Power	2,647	2,439	8,439	7,847
Supply cost balancing accounts	(5,212)	(4,621)	(11,110)	(11,663)
Other operation	6,570	6,493	19,423	18,142
Administrative and general	16,367	16,929	46,693	48,285
Depreciation and amortization	9,623	9,509	28,387	28,341
Maintenance	2,709	2,692	9,034	8,662
Property and other taxes	4,300	4,144	12,690	12,316
Gain on sale of assets	0	(17)	0	(8,318)
Total operating expenses	68,024	66,927	187,900	175,074
Operating Income	27,540	32,986	66,482	90,091
Other Income and Expenses
Interest expense	(5,781)	(5,638)	(17,397)	(17,170)
Interest income	451	318	1,288	1,175
Other, net	1,123	483	1,827	1,587
Total other income and expenses	(4,207)	(4,837)	(14,282)	(14,408)
Income from operations before income tax expense	23,333	28,149	52,200	75,683
Income tax expense	5,414	10,813	11,743	29,235
Net Income	$ 17,919	$ 17,336	$ 40,457	$ 46,448

CONSOLIDATED STATEMENTS OF CASH FLOW - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows From Operating Activities:
Net income	$ 50,082	$ 56,499
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	29,973	29,365
Provision for doubtful accounts	588	720
Deferred income taxes and investment tax credits	(2,732)	9,004
Stock-based compensation expense	3,648	2,303
Gain on sale of assets	(43)	(8,318)
Other — net	(566)	(802)
Changes in assets and liabilities:
Accounts receivable — customers	(4,385)	(10,683)
Unbilled receivable	1,196	(1,442)
Other accounts receivable	5,849	(1,951)
Receivables from the U.S. government	(14,818)	1,355
Materials and supplies	(827)	(1,083)
Prepayments and other assets	(1,319)	(1,401)
Increase(Decrease) in Contract Assets	11,345	0
Costs and estimated earnings in excess of billings on contracts	0	7,576
Regulatory assets	22,945	10,344
Accounts payable	(2,108)	5,337
Income taxes receivable/payable	4,831	23,657
Contract liabilities / Billings in excess of costs and estimated earnings on contracts	5,031	203
Accrued pension and other post-retirement benefits	(2,305)	(2,285)
Other liabilities	2,020	1,831
Net cash provided	108,405	120,229
Cash Flows From Investing Activities:
Capital expenditures	(87,328)	(77,896)
Proceeds from sale of assets	63	34,324
Other investing activities	(1,492)	(1,299)
Net cash used	(88,757)	(44,871)
Cash Flows From Financing Activities:
Proceeds from stock option exercises	348	884
Receipt of advances for and contributions in aid of construction	4,363	6,132
Refunds on advances for construction	(3,223)	(3,477)
Retirement or repayments of long-term debt	(326)	(320)
Net change in notes payable to banks	11,000	(44,000)
Dividends paid	(28,831)	(27,064)
Other financing activities	(1,217)	(1,288)
Net cash used	(17,886)	(69,133)
Net increase in cash and cash equivalents	1,762	6,225
Cash and cash equivalents, beginning of period	214	436
Cash and cash equivalents, end of period	1,976	6,661
Non-cash transactions:
Accrued payables for investment in utility plant	21,703	21,978
Property installed by developers and conveyed	1,968	1,796
Golden State Water Company
Cash Flows From Operating Activities:
Net income	40,457	46,448
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	28,566	28,522
Provision for doubtful accounts	597	563
Deferred income taxes and investment tax credits	(3,797)	9,139
Stock-based compensation expense	3,264	1,970
Gain on sale of assets	0	(8,318)
Other — net	(543)	(866)
Changes in assets and liabilities:
Accounts receivable — customers	(4,385)	(10,683)
Unbilled receivable	(1,135)	(3,138)
Other accounts receivable	4,755	(1,658)
Materials and supplies	(628)	(891)
Prepayments and other assets	(708)	(976)
Regulatory assets	22,945	10,344
Accounts payable	726	5,999
Intercompany receivable/payable	(361)	(623)
Income taxes receivable/payable from/to Parent	5,031	22,992
Accrued pension and other post-retirement benefits	(2,305)	(2,285)
Other liabilities	1,283	1,905
Net cash provided	93,762	98,444
Cash Flows From Investing Activities:
Capital expenditures	(79,240)	(76,373)
Proceeds from sale of assets	0	34,324
Other investing activities	(1,492)	(1,299)
Net cash used	(80,732)	(43,348)
Cash Flows From Financing Activities:
Receipt of advances for and contributions in aid of construction	4,363	6,132
Refunds on advances for construction	(3,223)	(3,477)
Retirement or repayments of long-term debt	(326)	(320)
Net change in intercompany borrowings	(16,000)	32,000
Dividends paid	(28,850)	(18,300)
Other financing activities	(1,055)	(1,086)
Net cash used	(13,091)	(49,051)
Net increase in cash and cash equivalents	(61)	6,045
Cash and cash equivalents, beginning of period	214	209
Cash and cash equivalents, end of period	153	6,254
Non-cash transactions:
Accrued payables for investment in utility plant	21,703	21,975
Property installed by developers and conveyed	$ 1,968	$ 1,796

Summary of Significant Accounting Policies	9 Months Ended
Summary of Significant Accounting Policies	Sep. 30, 2018
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 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")). 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 260,000 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. 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 wholly owned 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 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 began operations at Fort Riley in July 2018. There is no direct regulatory oversight by the CPUC over AWR or the operations, rates or services provided by ASUS or any of its wholly owned 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, all of which are wholly owned. These financial statements are prepared in conformity with accounting principles generally accepted in the United States of America. Intercompany transactions and balances have been eliminated in the AWR consolidated financial statements. The consolidated financial statements included herein have been prepared by Registrant, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). The December 31, 2017 condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by generally accepted accounting principles ("GAAP") in the United States of America. The preparation of the consolidated financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. In the opinion of management, all adjustments consisting of normal, recurring items and estimates necessary for a fair statement of the results for the interim periods have been made. It is suggested that these consolidated financial statements be read in conjunction with the consolidated financial statements and the notes thereto included in the Form 10-K for the year ended December 31, 2017 filed with the SEC. GSWC's 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. GSWC allocated corporate office administrative and general costs to ASUS of approximately $1.2 million and $1.0 million during the three months ended September 30, 2018 and 2017, respectively, and approximately $3.2 million and $3.0 million during the nine months ended September 30, 2018 and 2017, respectively. AWR has a $150.0 million syndicated credit facility, which was renewed in May 2018. As of September 30, 2018, AWR had $70.0 million outstanding under this facility. All amounts borrowed by AWR under the renewed facility are contractually due in May 2023 pursuant to the new terms and are generally priced off a spread to LIBOR. AWR borrows under this facility and provides funds to its subsidiaries, GSWC and ASUS, in support of their operations. The interest charged to GSWC and ASUS is sufficient to cover AWR’s interest expense under the credit facility. Amounts owed to AWR by GSWC, including for allocated expenses, are included in GSWC's intercompany payable under "Current Liabilities" as of September 30, 2018 and December 31, 2017. GSWC Long-Term Debt: In March of 2019, $40 million of GSWC's 6.70% senior note will mature. This note has been included in "Current Liabilities" in Registrant's balance sheets as of September 30, 2018. GSWC intends to issue additional common shares to AWR, borrow under its intercompany borrowing arrangement with AWR and/or issue additional long-term debt to fund the repayment of this note as well as to maintain normal operations and to meet its capital and other financing requirements. Recently Issued Accounting Pronouncements: In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") 2014-09, Revenue from Contracts with Customers (Topic 606). Under this guidance, an entity recognizes revenue when it transfers goods or services to customers in an amount that reflects what the entity expects in exchange for the goods or services. Registrant adopted this guidance under the modified retrospective approach beginning January 1, 2018. The adoption of this guidance did not have a material impact on Registrant's measurement or timing of revenue recognition but required additional disclosures (see Note 2). In March 2017, the FASB issued ASU 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. Prior to this guidance, the components of net benefit cost for retirement plans (such as service cost, interest cost, expected return on assets, and the amortization of prior service costs and actuarial gains and losses) were aggregated as operating costs for financial statement presentation purposes. Under the new guidance, the service cost component continues to be presented as operating costs, while all other components of net benefit cost are presented outside of operating income. The new guidance also limits any capitalization of net periodic benefits cost to the service cost component. Registrant adopted the new guidance beginning January 1, 2018, which did not have a material impact on its financial statements. Registrant used its prior year's disclosure of its pension and other employee benefit plans as an estimation for applying the retrospective presentation requirements of this guidance. The components of net periodic benefits cost, other than the service cost component, have been included in the line item “Other, net” in Registrant's income statements (see Note 8). In November of 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230) - Restricted Cash. The guidance requires restricted cash to be combined with cash and cash equivalents when reconciling the beginning and end of period cash balances in the statement of cash flows. The adoption of this new guidance in 2018 did not have an impact on Registrant's cash flow statements. In August 2016, the FASB also issued ASU 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. The adoption of this new guidance in 2018 did not have an impact on Registrant's cash flow statements. 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 is assessing whether to elect the practical expedients available under this standard. Registrant will apply the new lease standard as of January 1, 2019 and recognize a cumulative-effect adjustment (if any) to the opening balance of retained earnings. Any periods presented prior to January 1, 2019 will not be adjusted to conform to the new lease standard. Registrant continues to assess the impact of this standard to its financial statements. In August 2018, the FASB issued ASU 2018-15—Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. Under this standard, entities that enter into cloud computing service arrangements will apply existing internal-use software guidance to determine which implementation costs are eligible for capitalization. Under that guidance, implementation costs are capitalized or expensed depending on the nature of the costs and the project stage during which they are incurred. The new guidance is effective for fiscal years beginning after December 15, 2020. Early adoption is permitted. Registrant is currently evaluating the impact of adopting this guidance. In August 2018, the FASB issued ASU 2018-14—Compensation—Retirement Benefits—Defined Benefit Plans—General (Subtopic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans. This update removes disclosures to pension plans and other postretirement benefit plans that no longer are considered cost beneficial, clarifies the specific disclosure requirements and adds disclosure requirements deemed relevant. The amendments in this ASU are effective for fiscal years ending after December 15, 2020 and will be applied on a retrospective basis to all periods presented.

Revenue from Contract with Customer Revenue from Contract with Customer

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customers

Revenues from Contracts with Customers

Most of Registrant's revenues are accounted for under the revenue recognition accounting standard, "Revenue from Contracts with Customers - (Topic 606)." The adoption of this accounting standard effective January 1, 2018 did not have a material impact on Registrant's measurement or timing of revenue recognition.

GSWC provides water and electric utility services to customers as specified by the CPUC. The transaction prices for water and electric revenues are based on tariff rates authorized by the CPUC, which include both quantity-based and flat charges. Tariff revenues represent the adopted revenue requirement authorized by the CPUC intended to provide GSWC with an opportunity to recover its costs and earn a reasonable return on its net capital investment. The annual revenue requirements are comprised of operation and maintenance costs, administrative and general costs, depreciation and taxes in amounts authorized by the CPUC and a return on rate base consistent with the capital structure authorized by the CPUC.

Water and electric revenues are recognized over time as customers simultaneously receive and use the utility services provided. Water and electric revenues include amounts billed to customers on a cyclical basis, nearly all of which are based on meter readings for services provided. Customer bills also include surcharges for cost-recovery activities, which represent CPUC-authorized balancing and memorandum accounts that allow for the recovery of previously incurred operating costs. Revenues from these surcharges result in no impact to earnings as they are offset by corresponding increases in operating expenses to reflect the recovery of the associated costs. Customer payment terms are approximately 20 business days from the billing date. Unbilled revenues are amounts estimated to be billed for usage since the last meter-reading date to the end of the accounting period. Historical customer usage forms the basis for estimating unbilled revenue.

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 and counties (based on their ordinances) 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 ratemaking 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 $1.0 million for each of the three months ended September 30, 2018 and 2017, and $2.8 million for each of the nine months ended September 30, 2018 and 2017. When GSWC acts as an agent, and a tax is not required to be remitted if it is not collected from customers, the tax is accounted for on a net basis.

GSWC revenues tracked under the Water Revenue Adjustment Mechanism (“WRAM”) regulatory accounts for its water segment, and the Base Revenue Requirement Adjustment Mechanism ("BRRAM") regulatory account for its electric segment, are alternative revenue programs accounted for under Accounting Standards Codification ("ASC") Topic 980, Regulated Operations.

For ASUS, performance obligations consist of (i) performing ongoing operation and maintenance of the water and/or wastewater systems and treatment plants for each military base served, and (ii) performing construction activities (including renewal and replacement capital work) on each military base served. The transaction price for each performance obligation is either delineated in, or initially derived from, the applicable 50-year contract and/or any subsequent contract modifications. Depending on the state in which operations are conducted, the Military Utility Privatization Subsidiaries are also subject to certain state non-income tax assessments, which are accounted for on a gross basis and have been immaterial to date.

The ongoing performance of operation and maintenance of the water and/or wastewater systems and treatment plants is viewed as a single performance obligation for each 50-year contract with the U.S. government. Registrant recognizes revenue for operations and maintenance fees monthly using the "right to invoice" practical expedient under ASC Topic 606. ASUS has a right to consideration from the U.S. government in an amount that corresponds directly to the value to the U.S. government of ASUS’s performance completed to date. The contractual operations and maintenance fees are firm-fixed, and the level of effort or resources expended in the performance of the operations-and-maintenance-fees performance obligation is largely consistent over the 50-year term. Therefore, Registrant has determined that the monthly amounts invoiced for operations and maintenance performance are a fair reflection of the value transferred to the U.S. government. Invoices to the U.S. government for operations and maintenance service, as well as construction activities, are due upon receipt.

ASUS's construction activities consist of various projects to be performed. Each of these projects' transaction prices is delineated either in the 50-year contract or through a specific contract modification for each construction project, which includes the transaction price for that project. Each construction project is viewed as a separate, single performance obligation. Therefore, it is generally not necessary to allocate a construction transaction price to more than one construction performance obligation. Revenues for construction activities are recognized over time, with progress toward completion measured based on the input method using costs incurred relative to the total estimated costs (cost-to-cost method). Due to the nature of these construction projects, Registrant has determined the cost-to-cost input measurement to be the best method to measure progress towards satisfying its construction contract performance obligations, as compared to using an output measurement such as units produced. Changes in job performance, job site conditions, change orders and/or estimated profitability may result in revisions to costs and income for ASUS, and are recognized in the period in which any such revisions are determined. Pre-contract costs for ASUS, which consist of design and engineering labor costs, are deferred if recovery is probable, and are expensed as incurred if recovery is not probable. Deferred pre-contract costs have been immaterial to date.

Contracted services revenues recognized during the three and nine months ended September 30, 2018 from performance obligations satisfied in previous periods were not material.

Although GSWC has a diversified base of residential, commercial, industrial and other customers, revenues derived from residential and commercial customers account for approximately 90% of total water revenues, and 90% of total electric revenues. For the three and nine months ended September 30, 2018, disaggregated revenues from contracts with customers by segment are as follows:



(dollar in thousands)	Three Months Ended September 30, 2018			Nine Months Ended September 30, 2018
Water:
Tariff-based revenues	$	87,204		$	223,230
CPUC-approved surcharges (cost-recovery activities)	937			2,458
Other	486			1,381
Water revenues from contracts with customers	88,627			227,069
WRAM under-collection (alternative revenue program)	(938		)	1,765
Total water revenues	87,689			228,834

Electric:
Tariff-based revenues	8,207			26,021
CPUC-approved surcharges (cost-recovery activities)	62			172
Electric revenues from contracts with customers	8,269			26,193
BRRAM over-collection (alternative revenue program)	(394		)	(645		)
Total electric revenues	7,875			25,548

Contracted services:
Water	16,909			44,134
Wastewater	11,709			27,295
Contracted services revenues from contracts with customers	28,618			71,429

Total revenues	$	124,182		$	325,811

The opening and closing balances of the receivable from the U.S. government, contract assets and contract liabilities from contracts with customers, which related entirely to ASUS, are as follows:



(dollar in thousands)	September 30, 2018		January 1, 2018

Receivable from the U.S. government	$	54,968	$	40,150
Contract assets	$	19,043	$	30,388
Contract liabilities	$	8,942	$	3,911

As a result of the adoption of ASC Topic 606, amounts previously reported under "Costs and estimated earnings in excess of billings on contracts" are now reflected as either "Receivable from U.S. government" or "Contract assets," depending on whether receipt of these amounts is conditional on something other than the passage of time. Amounts previously reported under "Billings in excess of costs and estimated earnings on contracts" are now reflected as "Contract liabilities."

Contract Assets - Contract assets are those of ASUS and consist of unbilled revenues recognized from work-in-progress construction projects where the right to payment is conditional on something other than the passage of time. The classification of this asset as current or noncurrent is based on the timing of when ASUS expects to bill these amounts.

Contract Liabilities - Contract liabilities are those of ASUS and consist of billings in excess of revenue recognized. The classification of this liability as current or noncurrent is based on the timing of when ASUS expects to recognize revenue.

Revenue for the three and nine months ended September 30, 2018 that were included in contract liabilities at the beginning of the period were $3.4 million and $3.7 million, respectively.

As of September 30, 2018, Registrant's aggregate remaining performance obligations, all of which are for the contracted services segment, was $3.2 billion. Registrant expects to recognize revenue on these remaining performance obligations over the remaining terms of each of the 50-year contracts, which range from 36 to 50 years. Each of the contracts with the U.S. government is subject to termination, in whole or in part, prior to the end of its 50-year term for the convenience of the U.S. government.

Regulatory Matters

9 Months Ended

Sep. 30, 2018

Regulated Operations [Abstract]

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 September 30, 2018, Registrant had approximately $59.6 million of regulatory liabilities, net of regulatory assets not accruing carrying costs. Of this amount, (i) $81.9 million of regulatory liabilities are excess deferred income taxes arising from the lower federal income tax rate due to the Tax Cuts and Jobs Act ("Tax Act") enacted in December 2017 that are expected to be refunded to customers, (ii) $15.8 million of regulatory liabilities are from flowed-through deferred income taxes, (iii) $33.5 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) $1.1 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.

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 and 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 requiring it to write down the asset's value. Regulatory assets are offset against regulatory liabilities within each ratemaking area. Amounts expected to be collected or refunded in the next 12 months have been classified as current assets and current liabilities by ratemaking area. Regulatory assets, less regulatory liabilities, included in the consolidated balance sheets are as follows:



(dollars in thousands)	September 30, 2018			December 31, 2017
GSWC
Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account	$	24,264		$	29,556
Costs deferred for future recovery on Aerojet case	9,809			10,656
Pensions and other post-retirement obligations (Note 8)	31,066			33,019
Derivative unrealized loss (Note 5)	1,143			2,941
Low income rate assistance balancing accounts	3,660			5,972
General rate case memorandum accounts	6,798			10,522
Other regulatory assets	15,506			14,875
Excess deferred income taxes (Note 7)	(81,912		)	(83,231		)
Flow-through taxes, net (Note 7)	(15,816		)	(17,716		)
Tax Cuts and Jobs Act ("Tax Act") memorandum accounts	(8,274		)	—
Various refunds to customers	(7,880		)	(4,552		)
Total	$	(21,636	)	$	2,042

Regulatory matters are discussed in detail in the consolidated financial statements and the notes thereto included in the Form 10-K for the year ended December 31, 2017 filed with the SEC. The discussion below focuses on significant matters and developments since December 31, 2017.

Alternative-Revenue Programs:

GSWC records the difference between what it bills its water customers and that which is authorized by the CPUC using the Water Revenue Adjustment Mechanism (“WRAM”) and Modified Cost Balancing Account (“MCBA”) accounts approved by the CPUC. The over- or under-collection of the WRAM is aggregated with the MCBA over- or under-collection for the corresponding ratemaking area and bears interest at the current 90-day commercial paper rate.

As required by the accounting guidance for alternative revenue programs, GSWC is required to collect its WRAM balances, net of its MCBA, within 24 months following the year in which an under-collection is recorded in order to recognize such amounts as revenue. The recovery periods for the majority of GSWC's WRAM/MCBA balances are primarily within 12 to 24 months. GSWC has implemented surcharges to recover its WRAM/MCBA balances as of December 31, 2017. For the three months ended September 30, 2018 and 2017, surcharges (net of surcredits) of approximately $7.7 million and $11.4 million, respectively, were billed to customers to recover previously incurred under-collections in the WRAM/MCBA accounts. For the nine months ended September 30, 2018 and 2017, surcharges (net of surcredits) of approximately $17.5 million and $24.8 million, respectively, were billed to customers. During the nine months ended September 30, 2018, GSWC recorded additional net under-collections in the WRAM/MCBA accounts of $12.2 million mainly due to higher than adopted supply costs. As of September 30, 2018, GSWC had an aggregated regulatory asset of $24.3 million, which is comprised of a $3.4 million under-collection in the WRAM accounts and a $20.9 million under-collection in the MCBA accounts.

Other Regulatory Matters:

Tax Cuts and Jobs Act ("Tax Act"):

On December 22, 2017, the Tax Act was signed into federal law. The provisions of this major tax reform were generally effective January 1, 2018. The most significant provisions of the Tax Act impacting GSWC are the reduction of the federal corporate income tax rate from 35% to 21% and the elimination of bonus depreciation for regulated utilities. Pursuant to a CPUC directive, the 2018 impact of the Tax Act on the water segment’s adopted revenue requirement is being captured in a memorandum account effective January 1, 2018. For the three and nine months ended September 30, 2018, approximately $944,000 and $7.4 million, respectively, of reduced water-revenue requirements were tracked and recorded as a regulatory liability, which were largely offset by decreases in income tax expense. In March 2018, GSWC filed updated testimony revising the revenue requirements to reflect the impacts of the Tax Act in its pending water general rate case that will set new rates for the years 2019 - 2021. On July 1, 2018, new lower water rates, which incorporate the new federal income tax rate, were implemented for all water ratemaking areas.

The CPUC also ordered GSWC to update its pending electric general rate case filing, which will determine new electric rates for the years 2018 - 2021, to reflect the lower federal corporate income tax rate. As a result, for the three and nine months ended September 30, 2018, GSWC reduced electric revenues by approximately $125,000 and $848,000, respectively, and recorded a corresponding regulatory liability that will be satisfied as part of implementing overall new rates from the general rate case retroactive to January 1, 2018.

Reductions in the water and electric revenue requirements resulting from the impacts of the Tax Act are largely offset by decreases in GSWC's income tax expense, resulting in no material impact to earnings (see Note 7).

Cost of Capital Proceeding:

In March 2018, the CPUC issued a final decision in the cost of capital proceeding for GSWC and three other water utilities for the years 2018 - 2020. Among other things, the final decision adopted for GSWC's water segment a return on equity of 8.90%, with a return on rate base of 7.91%. The previously authorized return on equity for GSWC’s water segment was 9.43%, with a return on rate base of 8.34%. Including the effects of the Tax Act, the lower return on equity and rate base are expected to decrease GSWC’s annual adopted revenue requirement beginning in 2018 by approximately $3.6 million. In April 2018, GSWC implemented new water rates to incorporate the cost of capital decision. For the nine months ended September 30, 2018, GSWC recorded a regulatory liability with a corresponding decrease in water revenues of approximately $955,000 representing the revenue difference between the old and new cost of capital rates through April 2018.

Pending General Rate Case Filings:

In July 2017, GSWC filed a general rate case application with the CPUC for all of GSWC’s water regions and the general office. This general rate case will determine new water rates for the years 2019 - 2021. On August 15, 2018, GSWC and the CPUC’s Public Advocates Office ("CalPA"), formerly the Office of Ratepayer Advocates, filed a joint motion to adopt a settlement agreement between GSWC and CalPA in connection with this general rate case. If approved by the CPUC, this settlement agreement will resolve all of the issues in the general rate case. GSWC and CalPA informed the assigned Administrative Law Judge ("ALJ”) that hearings would not be needed in light of the settlement agreement. Subsequently, the ALJ issued a ruling requesting additional information on a number of items in the general rate case. GSWC has provided the additional information requested by the ALJ and believes it has satisfied all of the questions raised. Both the ALJ’s request and GSWC’s response are public information. At this time, GSWC is awaiting a proposed decision by the ALJ, which is expected during the fourth quarter of 2018, with a final decision by the CPUC expected by the first quarter of 2019. When approved, the new rates will become effective January 1, 2019.

In May 2017, GSWC filed its electric general rate case application with the CPUC to determine new electric rates for the years 2018 through 2021. GSWC and CalPA have reached a tentative settlement, which resolves all revenue requirement issues in this general rate case. A settlement conference with all parties in the rate case is scheduled for November 2018. Among other things, the tentative settlement incorporates a previous stipulation in the case, which authorizes a new return on equity for GSWC's electric segment of 9.60%. GSWC’s prior authorized return on equity for its electric segment was 9.95%. The stipulation also included a capital structure and debt cost similar to those approved by the CPUC in March 2018 in connection with GSWC's water segment cost of capital proceeding, as discussed above. Because of the delay in finalizing the electric general rate case, year-to-date 2018 billed electric revenues have been based on 2017 adopted rates, pending a final decision by the CPUC in this rate case application. When a final decision is approved, the new electric rates will be retroactive to January 1, 2018.

Earnings per Share/Capital Stock

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Earnings per Share/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 stock incentive plans for employees and the non-employee directors stock 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 used for calculating basic net income per share:



Basic:	For The Three Months Ended September 30,				For The Nine Months Ended September 30,
(in thousands, except per share amounts)	2018		2017		2018		2017
Net income	$	22,952	$	21,006	50,082		56,499
Less: (a) Distributed earnings to common shareholders	10,102		9,349		28,831		27,064
Distributed earnings to participating securities	54		50		151		139
Undistributed earnings	12,796		11,607		21,100		29,296

(b) Undistributed earnings allocated to common shareholders	12,727		11,546		20,991		29,147
Undistributed earnings allocated to participating securities	69		61		109		149

Total income available to common shareholders, basic (a) + (b)	$	22,829	$	20,895	$	49,822	$	56,211

Weighted average Common Shares outstanding, basic	36,737		36,659		36,728		36,625

Basic earnings per Common Share	$	0.62	$	0.57	$	1.36	$	1.53

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 stock incentive plans for employees and the non-employee directors stock plans, and net income. At September 30, 2018 and 2017, there were 47,792 and 70,702 options outstanding, respectively, under these plans. At September 30, 2018 and 2017, there were also 198,613 and 195,457 restricted stock units outstanding, respectively, 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:



Diluted:	For The Three Months Ended September 30,				For The Nine Months Ended September 30,
(in thousands, except per share amounts)	2018		2017		2018		2017
Common shareholders earnings, basic	$	22,829	$	20,895	$	49,822	$	56,211
Undistributed earnings for dilutive stock-based awards	69		61		109		149
Total common shareholders earnings, diluted	$	22,898	$	20,956	$	49,931	$	56,360

Weighted average common shares outstanding, basic	36,737		36,659		36,728		36,625
Stock-based compensation (1)	213		197		207		188
Weighted average common shares outstanding, diluted	36,950		36,856		36,935		36,813

Diluted earnings per Common Share	$	0.62	$	0.57	$	1.35	$	1.53

(1) In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 47,792 and 70,702 stock options at September 30, 2018 and 2017, respectively, were deemed to be outstanding in accordance with the accounting guidance on earnings per share. All of the 198,613 and 195,457 restricted stock units at September 30, 2018 and 2017, respectively, were included in the calculation of diluted EPS for the three and nine months ended September 30, 2018 and 2017.

No stock options outstanding at September 30, 2018 had an exercise price greater than the average market price of AWR’s Common Shares for the three and nine months ended September 30, 2018. There were no stock options outstanding at September 30, 2018 or 2017 that were anti-dilutive.

During the nine months ended September 30, 2018 and 2017, AWR issued 64,245 and 107,815 Common Shares, for approximately $348,000 and $884,000, respectively, under Registrant’s Common Share Purchase and Dividend Reinvestment Plan, the 401(k) Plan, the 2000 and 2008 Stock Incentive Plans and the 2003 and 2013 Non-Employee Directors Stock Plans.

During the three months ended September 30, 2018 and 2017, AWR paid quarterly dividends of approximately $10.1 million, or $0.275 per share, and $9.3 million, or $0.255 per share, respectively. During the nine months ended September 30, 2018 and 2017, AWR paid quarterly dividends to shareholders of approximately $28.8 million, or $0.785 per share, and $27.1 million, or $0.739 per share, respectively.

Derivative Instruments

9 Months Ended

Sep. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments

Derivative financial instruments are used to manage exposure to commodity price risk. Commodity price risk represents the potential impact that can be caused by a change in the market value of a commodity. 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 immediately execute new long-term purchased power contracts with energy providers. 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 the period during which the power is purchased under the contracts.

BVES's long-term contracts are subject to the accounting guidance for derivatives and require mark-to-market derivative accounting. Among other things, the CPUC also authorized GSWC 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 are deferred monthly into a non-interest bearing regulatory memorandum account that tracks the changes in fair value of the derivatives throughout the term of the contracts. As a result, these unrealized gains and losses do not impact GSWC’s earnings. As of September 30, 2018, there was a $1.1 million unrealized loss in the memorandum account for the purchased power contracts as a result of the drop in energy prices. The notional volume of derivatives remaining under these long-term contracts as of September 30, 2018 was approximately 123,000 megawatt hours.

The accounting guidance for fair value measurements applies to all financial assets and financial liabilities that are 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).

To value the contracts, Registrant applies the Black-76 model, utilizing various inputs that include quoted market prices for energy over the duration of the contracts. The market prices used to determine the fair value for these derivative instruments 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 instruments. When such inputs have a significant impact on the measurement of fair value, the instruments are categorized as Level 3. Accordingly, the valuation of the derivatives 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 Level 3 derivatives for the three and nine months ended September 30, 2018 and 2017:



	For The Three Months Ended September 30,						For The Nine Months Ended September 30,
(dollars in thousands)	2018			2017			2018			2017
Fair value at beginning of the period	$	(1,710	)	$	(4,493	)	$	(2,941	)	$	(4,901	)
Unrealized gain on purchased power contracts	567			656			1,798			1,064
Fair value at end of the period	$	(1,143	)	$	(3,837	)	$	(1,143	)	$	(3,837	)

Fair Value of Financial Instruments

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

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.

Investments held in a Rabbi Trust for the supplemental executive retirement plan ("SERP") are measured at fair value and totaled $17.8 million as of September 30, 2018. All equity investments in the Rabbi Trust are Level 1 investments in mutual funds. The investments held in the Rabbi Trust are included in Other Property and Investments on Registrant's balance sheets.

The table below estimates the fair value of long-term debt held by GSWC. The fair values as of September 30, 2018 and December 31, 2017 were determined using rates for similar financial instruments of the same duration utilizing Level 2 methods and assumptions. The interest rates used for the September 30, 2018 valuation increased as compared to December 31, 2017, decreasing the fair value of long-term debt as of September 30, 2018. Changes in the assumptions will produce different results.



	September 30, 2018				December 31, 2017
(dollars in thousands)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Financial liabilities:
Long-term debt—GSWC (1)	$	324,978	$	389,438	$	325,265	$	424,042

___________________

(1) Excludes debt issuance costs and redemption premiums.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes On December 22, 2017, the Tax Act was signed into federal law. The provisions of this major tax reform were generally effective January 1, 2018. Among its significant provisions, the Tax Act reduced the federal corporate income tax rate from 35% to 21% and eliminated bonus depreciation for regulated utilities. AWR's effective tax rate (“ETR”) was 23.2% and 37.3% for the three months ended September 30, 2018 and 2017, respectively, and was 21.7% and 37.3% for the nine months ended September 30, 2018 and 2017, respectively. GSWC's ETR was 23.2% and 38.4% for the three months ended September 30, 2018 and 2017, respectively, and was 22.5% and 38.6% for the nine months ended September 30, 2018 and 2017, respectively. Both decreases were due primarily to the reduction in the federal corporate income tax rate. AWR's ETR differed from the new federal statutory rate primarily as a result of the differences between GSWC's ETR and the new federal statutory rate. These differences resulted primarily from: (i) state taxes, (ii) permanent differences including the excess tax benefits from share-based payments, which were reflected in the income statements and resulted in a reduction to income tax expense during the three and nine months ended September 30, 2018 and 2017, (iii) differences between book and taxable income that are treated as flow-through adjustments in accordance with regulatory requirements (principally from plant, rate-case, and compensation expenses), and (iv) commencement of the amortization of the excess deferred income tax liability brought about by the lower federal corporate income tax rate. There were no material updates to the excess deferred income tax liability balance during the three and nine months ended September 30, 2018 in accordance with Staff Accounting Bulletin 118.

Employee Benefit Plans

9 Months Ended

Sep. 30, 2018

Retirement Benefits [Abstract]

Employee Benefit Plans

The components of net periodic benefit costs, before allocation to the overhead pool, for Registrant’s pension plan, postretirement plan and the supplemental executive retirement plan ("SERP") for the three and nine months ended September 30, 2018 and 2017 are as follows:



	For The Three Months Ended September 30,
	Pension Benefits						Other Postretirement Benefits						SERP
(dollars in thousands)	2018			2017			2018			2017			2018		2017
Components of Net Periodic Benefits Cost:
Service cost	$	1,335		$	1,250		$	48		$	53		$	274	$	232
Interest cost	1,912			1,976			75			73			222		223
Expected return on plan assets	(2,793		)	(2,428		)	(123		)	(107		)	—		—
Amortization of prior service cost (benefit)	—			—			—			—			—		3
Amortization of actuarial (gain) loss	314			231			(212		)	(242		)	262		194
Net periodic pension cost under accounting standards	768			1,029			(212		)	(223		)	758		652
Regulatory adjustment — deferred	—			266			—			—			—		—
Total expense recognized, before surcharges and allocation to overhead pool	$	768		$	1,295		$	(212	)	$	(223	)	$	758	$	652



	For The Nine Months Ended September 30,
	Pension Benefits						Other Postretirement Benefits						SERP
(dollars in thousands)	2018			2017			2018			2017			2018		2017
Components of Net Periodic Benefits Cost:
Service cost	$	4,005		$	3,750		$	162		$	171		$	822	$	696
Interest cost	5,736			5,928			219			243			666		669
Expected return on plan assets	(8,379		)	(7,278		)	(369		)	(351		)	—		—
Amortization of prior service cost (benefit)	—			—			—			—			—		9
Amortization of actuarial (gain) loss	942			693			(576		)	(582		)	786		582
Net periodic pension cost under accounting standards	2,304			3,093			(564		)	(519		)	2,274		1,956
Regulatory adjustment — deferred	—			791			—			—			—		—
Total expense recognized, before surcharges and allocation to overhead pool	$	2,304		$	3,884		$	(564	)	$	(519	)	$	2,274	$	1,956

In accordance with new accounting guidance (Note 1), effective January 1, 2018, Registrant changed the financial statement presentation for the costs of its defined benefit pension plans and other retirement benefits. The components of net periodic benefits cost, other than the service cost component, have been included in the line item “Other, net” in Registrant's income statements. Prior period amounts have been reclassified on the income statements to conform to the current-period presentation.

During the nine months ended September 30, 2018, Registrant contributed $6.0 million to its pension plan.

Regulatory Adjustment:

As authorized by the CPUC in the most recent water and electric general rate case decisions, GSWC utilizes two-way balancing accounts for its water and electric regions and the general office to track differences between the forecasted annual pension expenses in rates, or expected to be in rates, and the actual annual expense recorded by GSWC in accordance with the accounting guidance for pension costs. As of September 30, 2018, GSWC had a $2.5 million over-collection in the two-way pension balancing accounts included as part of the pension regulatory asset (Note 3).

Contingencies and Gain on Sale of Assets	9 Months Ended
Contingencies and Gain on Sale of Assets	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Contingencies and Gain on Sale of Assets	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. Ojai Water System and Gain on Sale of Assets: Pursuant to a settlement agreement, on June 8, 2017, Casitas Municipal Water District (“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. 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 terms of the settlement agreement resolved the eminent domain action and dismissed all claims against GSWC brought by Casitas and another third party. Environmental Clean-Up and Remediation: GSWC has been involved in environmental remediation and cleanup at a plant site that contained an underground storage tank that had been used to store gasoline for its vehicles. The 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 the site. Analyses indicate that off-site monitoring wells may be necessary to document the effectiveness of remediation. As of September 30, 2018, the total spent to clean-up and remediate GSWC’s plant facility was approximately $5.4 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 September 30, 2018, GSWC has a regulatory asset and an accrued liability for the estimated additional 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 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.

Business Segments

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Business Segments

AWR has three reportable segments, water, electric and contracted services, whereas GSWC has two segments, water and electric. On a stand-alone basis, AWR has no material assets other than its investments in its subsidiaries.

All activities of GSWC, a rate-regulated utility, are located within California. Activities of ASUS and its subsidiaries are conducted in California, Florida, Georgia, Kansas, Maryland, New Mexico, North Carolina, South Carolina, Texas and Virginia. Each of ASUS’s wholly owned 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 its 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 amounts are net of respective accumulated provisions for depreciation. Capital additions reflect capital expenditures paid in cash, and exclude U.S. government- and third-party contractor-funded capital expenditures for ASUS and property installed by developers and conveyed to GSWC.



	As Of And For The Three Months Ended September 30, 2018
	GSWC							AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS			Parent			AWR
Operating revenues	$	87,689	$	7,875	$	28,618		$	—		$	124,182
Operating income (loss)	26,710		830		6,437			(2		)	33,975
Interest expense, net	5,039		291		(118		)	95			5,307
Utility plant	1,187,786		61,404		13,725			—			1,262,915
Depreciation and amortization expense (1)	9,058		565		495			—			10,118
Income tax expense (benefit)	5,247		167		1,606			(81		)	6,939
Capital additions	24,590		1,140		2,816			—			28,546



	As Of And For The Three Months Ended September 30, 2017
	GSWC						AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS		Parent			AWR
Operating revenues	$	91,919	$	7,994	$	24,505	$	—		$	124,418
Operating income (loss) (2)	31,408		1,578		5,551		(3		)	38,534
Interest expense, net	4,974		346		58		76			5,454
Utility plant	1,117,674		57,669		6,273		—			1,181,616
Depreciation and amortization expense (1)	8,972		537		345		—			9,854
Income tax expense (benefit)	10,544		269		1,944		(249		)	12,508
Capital additions	30,536		559		905		—			32,000



	As Of And For The Nine Months Ended September 30, 2018
	GSWC							AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS			Parent			AWR
Operating revenues	$	228,834	$	25,548	$	71,429		$	—		$	325,811
Operating income (loss)	62,012		4,470		11,759			(7		)	78,234
Interest expense, net	15,095		1,014		(255		)	252			16,106
Utility plant	1,187,786		61,404		13,725			—			1,262,915
Depreciation and amortization expense (1)	26,693		1,694		1,407			—			29,794
Income tax expense (benefit)	10,805		938		2,865			(718		)	13,890
Capital additions	75,976		3,264		8,088			—			87,328



	As Of And For The Nine Months Ended September 30, 2017
	GSWC						AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS		Parent			AWR
Operating revenues	$	239,057	$	26,108	$	71,258	$	—		$	336,423
Operating income (loss) (2)	84,200		5,891		15,055		(10		)	105,136
Interest expense, net	14,924		1,071		214		197			16,406
Utility plant	1,117,674		57,669		6,273		—			1,181,616
Depreciation and amortization expense (1)	26,731		1,610		843		—			29,184
Income tax expense (benefit)	27,739		1,496		5,152		(717		)	33,670
Capital additions	74,113		2,260		1,523		—			77,896

(1) Depreciation computed on GSWC’s transportation equipment is recorded in other operating expenses and totaled $58,000 and $61,000 for the three months ended September 30, 2018 and 2017, respectively, and $179,000 and $181,000 for the nine months ended September 30, 2018 and 2017, respectively.

(2) Adjusted to conform to current-year presentation pursuant to the adoption of ASU 2017-07, Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.

The following table reconciles total utility plant (a key figure for ratemaking) to total consolidated assets (in thousands):



	September 30,
	2018		2017
Net property, plant and equipment	$	1,262,915	$	1,181,616
Other assets	202,127		304,870
Total consolidated assets	$	1,465,042	$	1,486,486

Summary of Significant Accounting Policies: (Policies)	9 Months Ended
Summary of Significant Accounting Policies: (Policies)	Sep. 30, 2018
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 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")). 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 260,000 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. 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 wholly owned 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 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 began operations at Fort Riley in July 2018. There is no direct regulatory oversight by the CPUC over AWR or the operations, rates or services provided by ASUS or any of its wholly owned 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, all of which are wholly owned. These financial statements are prepared in conformity with accounting principles generally accepted in the United States of America. Intercompany transactions and balances have been eliminated in the AWR consolidated financial statements. The consolidated financial statements included herein have been prepared by Registrant, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). The December 31, 2017 condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by generally accepted accounting principles ("GAAP") in the United States of America. The preparation of the consolidated financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. In the opinion of management, all adjustments consisting of normal, recurring items and estimates necessary for a fair statement of the results for the interim periods have been made. It is suggested that these consolidated financial statements be read in conjunction with the consolidated financial statements and the notes thereto included in the Form 10-K for the year ended December 31, 2017 filed with the SEC.
GSWC's Related Party Transactions	GSWC's 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. GSWC allocated corporate office administrative and general costs to ASUS of approximately $1.2 million and $1.0 million during the three months ended September 30, 2018 and 2017, respectively, and approximately $3.2 million and $3.0 million during the nine months ended September 30, 2018 and 2017, respectively. AWR has a $150.0 million syndicated credit facility, which was renewed in May 2018. As of September 30, 2018, AWR had $70.0 million outstanding under this facility. All amounts borrowed by AWR under the renewed facility are contractually due in May 2023 pursuant to the new terms and are generally priced off a spread to LIBOR. AWR borrows under this facility and provides funds to its subsidiaries, GSWC and ASUS, in support of their operations. The interest charged to GSWC and ASUS is sufficient to cover AWR’s interest expense under the credit facility. Amounts owed to AWR by GSWC, including for allocated expenses, are included in GSWC's intercompany payable under "Current Liabilities" as of September 30, 2018 and December 31, 2017.
GSWC Long-Term Debt	GSWC Long-Term Debt: In March of 2019, $40 million of GSWC's 6.70% senior note will mature. This note has been included in "Current Liabilities" in Registrant's balance sheets as of September 30, 2018. GSWC intends to issue additional common shares to AWR, borrow under its intercompany borrowing arrangement with AWR and/or issue additional long-term debt to fund the repayment of this note as well as to maintain normal operations and to meet its capital and other financing requirements.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements: In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") 2014-09, Revenue from Contracts with Customers (Topic 606). Under this guidance, an entity recognizes revenue when it transfers goods or services to customers in an amount that reflects what the entity expects in exchange for the goods or services. Registrant adopted this guidance under the modified retrospective approach beginning January 1, 2018. The adoption of this guidance did not have a material impact on Registrant's measurement or timing of revenue recognition but required additional disclosures (see Note 2). In March 2017, the FASB issued ASU 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. Prior to this guidance, the components of net benefit cost for retirement plans (such as service cost, interest cost, expected return on assets, and the amortization of prior service costs and actuarial gains and losses) were aggregated as operating costs for financial statement presentation purposes. Under the new guidance, the service cost component continues to be presented as operating costs, while all other components of net benefit cost are presented outside of operating income. The new guidance also limits any capitalization of net periodic benefits cost to the service cost component. Registrant adopted the new guidance beginning January 1, 2018, which did not have a material impact on its financial statements. Registrant used its prior year's disclosure of its pension and other employee benefit plans as an estimation for applying the retrospective presentation requirements of this guidance. The components of net periodic benefits cost, other than the service cost component, have been included in the line item “Other, net” in Registrant's income statements (see Note 8). In November of 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230) - Restricted Cash. The guidance requires restricted cash to be combined with cash and cash equivalents when reconciling the beginning and end of period cash balances in the statement of cash flows. The adoption of this new guidance in 2018 did not have an impact on Registrant's cash flow statements. In August 2016, the FASB also issued ASU 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. The adoption of this new guidance in 2018 did not have an impact on Registrant's cash flow statements. 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 is assessing whether to elect the practical expedients available under this standard. Registrant will apply the new lease standard as of January 1, 2019 and recognize a cumulative-effect adjustment (if any) to the opening balance of retained earnings. Any periods presented prior to January 1, 2019 will not be adjusted to conform to the new lease standard. Registrant continues to assess the impact of this standard to its financial statements. In August 2018, the FASB issued ASU 2018-15—Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. Under this standard, entities that enter into cloud computing service arrangements will apply existing internal-use software guidance to determine which implementation costs are eligible for capitalization. Under that guidance, implementation costs are capitalized or expensed depending on the nature of the costs and the project stage during which they are incurred. The new guidance is effective for fiscal years beginning after December 15, 2020. Early adoption is permitted. Registrant is currently evaluating the impact of adopting this guidance. In August 2018, the FASB issued ASU 2018-14—Compensation—Retirement Benefits—Defined Benefit Plans—General (Subtopic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans. This update removes disclosures to pension plans and other postretirement benefit plans that no longer are considered cost beneficial, clarifies the specific disclosure requirements and adds disclosure requirements deemed relevant. The amendments in this ASU are effective for fiscal years ending after December 15, 2020 and will be applied on a retrospective basis to all periods presented.

Revenue from Contract with Customer (Tables)

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

For the three and nine months ended September 30, 2018, disaggregated revenues from contracts with customers by segment are as follows:



(dollar in thousands)	Three Months Ended September 30, 2018			Nine Months Ended September 30, 2018
Water:
Tariff-based revenues	$	87,204		$	223,230
CPUC-approved surcharges (cost-recovery activities)	937			2,458
Other	486			1,381
Water revenues from contracts with customers	88,627			227,069
WRAM under-collection (alternative revenue program)	(938		)	1,765
Total water revenues	87,689			228,834

Electric:
Tariff-based revenues	8,207			26,021
CPUC-approved surcharges (cost-recovery activities)	62			172
Electric revenues from contracts with customers	8,269			26,193
BRRAM over-collection (alternative revenue program)	(394		)	(645		)
Total electric revenues	7,875			25,548

Contracted services:
Water	16,909			44,134
Wastewater	11,709			27,295
Contracted services revenues from contracts with customers	28,618			71,429

Total revenues	$	124,182		$	325,811

Schedule of Contract Assets and Contract LiabilitiesRevenue from Contract with Customer

The opening and closing balances of the receivable from the U.S. government, contract assets and contract liabilities from contracts with customers, which related entirely to ASUS, are as follows:



(dollar in thousands)	September 30, 2018		January 1, 2018

Receivable from the U.S. government	$	54,968	$	40,150
Contract assets	$	19,043	$	30,388
Contract liabilities	$	8,942	$	3,911

Regulatory Matters: (Tables)

9 Months Ended

Sep. 30, 2018

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:



(dollars in thousands)	September 30, 2018			December 31, 2017
GSWC
Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account	$	24,264		$	29,556
Costs deferred for future recovery on Aerojet case	9,809			10,656
Pensions and other post-retirement obligations (Note 8)	31,066			33,019
Derivative unrealized loss (Note 5)	1,143			2,941
Low income rate assistance balancing accounts	3,660			5,972
General rate case memorandum accounts	6,798			10,522
Other regulatory assets	15,506			14,875
Excess deferred income taxes (Note 7)	(81,912		)	(83,231		)
Flow-through taxes, net (Note 7)	(15,816		)	(17,716		)
Tax Cuts and Jobs Act ("Tax Act") memorandum accounts	(8,274		)	—
Various refunds to customers	(7,880		)	(4,552		)
Total	$	(21,636	)	$	2,042

Earnings per Share/Capital Stock: (Tables)

9 Months Ended

Sep. 30, 2018

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



Basic:	For The Three Months Ended September 30,				For The Nine Months Ended September 30,
(in thousands, except per share amounts)	2018		2017		2018		2017
Net income	$	22,952	$	21,006	50,082		56,499
Less: (a) Distributed earnings to common shareholders	10,102		9,349		28,831		27,064
Distributed earnings to participating securities	54		50		151		139
Undistributed earnings	12,796		11,607		21,100		29,296

(b) Undistributed earnings allocated to common shareholders	12,727		11,546		20,991		29,147
Undistributed earnings allocated to participating securities	69		61		109		149

Total income available to common shareholders, basic (a) + (b)	$	22,829	$	20,895	$	49,822	$	56,211

Weighted average Common Shares outstanding, basic	36,737		36,659		36,728		36,625

Basic earnings per Common Share	$	0.62	$	0.57	$	1.36	$	1.53

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:



Diluted:	For The Three Months Ended September 30,				For The Nine Months Ended September 30,
(in thousands, except per share amounts)	2018		2017		2018		2017
Common shareholders earnings, basic	$	22,829	$	20,895	$	49,822	$	56,211
Undistributed earnings for dilutive stock-based awards	69		61		109		149
Total common shareholders earnings, diluted	$	22,898	$	20,956	$	49,931	$	56,360

Weighted average common shares outstanding, basic	36,737		36,659		36,728		36,625
Stock-based compensation (1)	213		197		207		188
Weighted average common shares outstanding, diluted	36,950		36,856		36,935		36,813

Diluted earnings per Common Share	$	0.62	$	0.57	$	1.35	$	1.53

Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2018

Golden State Water Company

Derivative Instruments, Gain (Loss) [Line Items]

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation

The following table presents changes in the fair value of GSWC’s Level 3 derivatives for the three and nine months ended September 30, 2018 and 2017:



	For The Three Months Ended September 30,						For The Nine Months Ended September 30,
(dollars in thousands)	2018			2017			2018			2017
Fair value at beginning of the period	$	(1,710	)	$	(4,493	)	$	(2,941	)	$	(4,901	)
Unrealized gain on purchased power contracts	567			656			1,798			1,064
Fair value at end of the period	$	(1,143	)	$	(3,837	)	$	(1,143	)	$	(3,837	)

Fair Value of Financial Instruments: (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of estimates of the fair value of long-term debt



	September 30, 2018				December 31, 2017
(dollars in thousands)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Financial liabilities:
Long-term debt—GSWC (1)	$	324,978	$	389,438	$	325,265	$	424,042

Employee Benefit Plans: (Tables)

9 Months Ended

Sep. 30, 2018

Retirement Benefits [Abstract]

Schedule of components of net periodic benefit costs, before allocation to the overhead pool, for Registrant's pension plan, postretirement plan, and SERP



	For The Three Months Ended September 30,
	Pension Benefits						Other Postretirement Benefits						SERP
(dollars in thousands)	2018			2017			2018			2017			2018		2017
Components of Net Periodic Benefits Cost:
Service cost	$	1,335		$	1,250		$	48		$	53		$	274	$	232
Interest cost	1,912			1,976			75			73			222		223
Expected return on plan assets	(2,793		)	(2,428		)	(123		)	(107		)	—		—
Amortization of prior service cost (benefit)	—			—			—			—			—		3
Amortization of actuarial (gain) loss	314			231			(212		)	(242		)	262		194
Net periodic pension cost under accounting standards	768			1,029			(212		)	(223		)	758		652
Regulatory adjustment — deferred	—			266			—			—			—		—
Total expense recognized, before surcharges and allocation to overhead pool	$	768		$	1,295		$	(212	)	$	(223	)	$	758	$	652



	For The Nine Months Ended September 30,
	Pension Benefits						Other Postretirement Benefits						SERP
(dollars in thousands)	2018			2017			2018			2017			2018		2017
Components of Net Periodic Benefits Cost:
Service cost	$	4,005		$	3,750		$	162		$	171		$	822	$	696
Interest cost	5,736			5,928			219			243			666		669
Expected return on plan assets	(8,379		)	(7,278		)	(369		)	(351		)	—		—
Amortization of prior service cost (benefit)	—			—			—			—			—		9
Amortization of actuarial (gain) loss	942			693			(576		)	(582		)	786		582
Net periodic pension cost under accounting standards	2,304			3,093			(564		)	(519		)	2,274		1,956
Regulatory adjustment — deferred	—			791			—			—			—		—
Total expense recognized, before surcharges and allocation to overhead pool	$	2,304		$	3,884		$	(564	)	$	(519	)	$	2,274	$	1,956

Business Segments: (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Schedule of reporting segments information



	As Of And For The Three Months Ended September 30, 2018
	GSWC							AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS			Parent			AWR
Operating revenues	$	87,689	$	7,875	$	28,618		$	—		$	124,182
Operating income (loss)	26,710		830		6,437			(2		)	33,975
Interest expense, net	5,039		291		(118		)	95			5,307
Utility plant	1,187,786		61,404		13,725			—			1,262,915
Depreciation and amortization expense (1)	9,058		565		495			—			10,118
Income tax expense (benefit)	5,247		167		1,606			(81		)	6,939
Capital additions	24,590		1,140		2,816			—			28,546



	As Of And For The Three Months Ended September 30, 2017
	GSWC						AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS		Parent			AWR
Operating revenues	$	91,919	$	7,994	$	24,505	$	—		$	124,418
Operating income (loss) (2)	31,408		1,578		5,551		(3		)	38,534
Interest expense, net	4,974		346		58		76			5,454
Utility plant	1,117,674		57,669		6,273		—			1,181,616
Depreciation and amortization expense (1)	8,972		537		345		—			9,854
Income tax expense (benefit)	10,544		269		1,944		(249		)	12,508
Capital additions	30,536		559		905		—			32,000



	As Of And For The Nine Months Ended September 30, 2018
	GSWC							AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS			Parent			AWR
Operating revenues	$	228,834	$	25,548	$	71,429		$	—		$	325,811
Operating income (loss)	62,012		4,470		11,759			(7		)	78,234
Interest expense, net	15,095		1,014		(255		)	252			16,106
Utility plant	1,187,786		61,404		13,725			—			1,262,915
Depreciation and amortization expense (1)	26,693		1,694		1,407			—			29,794
Income tax expense (benefit)	10,805		938		2,865			(718		)	13,890
Capital additions	75,976		3,264		8,088			—			87,328



	As Of And For The Nine Months Ended September 30, 2017
	GSWC						AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS		Parent			AWR
Operating revenues	$	239,057	$	26,108	$	71,258	$	—		$	336,423
Operating income (loss) (2)	84,200		5,891		15,055		(10		)	105,136
Interest expense, net	14,924		1,071		214		197			16,406
Utility plant	1,117,674		57,669		6,273		—			1,181,616
Depreciation and amortization expense (1)	26,731		1,610		843		—			29,184
Income tax expense (benefit)	27,739		1,496		5,152		(717		)	33,670
Capital additions	74,113		2,260		1,523		—			77,896

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 ratemaking) to total consolidated assets (in thousands):



	September 30,
	2018		2017
Net property, plant and equipment	$	1,262,915	$	1,181,616
Other assets	202,127		304,870
Total consolidated assets	$	1,465,042	$	1,486,486

Summary of Significant Accounting Policies: (Details) customer in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) customer registrant	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Basis of Presentation:
Number of registrants filing combined report \| registrant			2
Related Party Transactions
Notes payable to bank	$ 70,000,000		$ 70,000,000		$ 0
AWR \| Syndicated Credit Facility
Related Party Transactions
Maximum borrowing capacity on line of credit	150,000,000		150,000,000
Golden State Water Company
Related Party Transactions
Payments to affiliate for corporate office administrative and general costs	1,200,000	$ 1,000,000	3,200,000	$ 3,000,000
Golden State Water Company \| Notes Payable 6.7 Percent Due 2019
Related Party Transactions
Notes outstanding	$ 40,000,000		$ 40,000,000
Interest rate	6.70%		6.70%
Golden State Water Company \| Water Service Utility Operations
Nature of Operations:
Number of customers \| customer			260
Golden State Water Company \| Electric Service Utility Operations
Nature of Operations:
Number of customers \| customer			24
American States Utility Services \| Contracted Services
Nature of Operations:
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases			50 years
Fort Riley \| Contracted Services
Nature of Operations:
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases				50 years

Revenue from Contract with Customer (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Contract liability revenue recognized	$ 3.4		$ 3.7
Performance obligation remaining	0.0		$ 0.0
Registration payment arrangement period			20 days
Golden State Water Company
Disaggregation of Revenue [Line Items]
Reimbursement Revenue	$ 1.0	$ 1.0	$ 2.8	$ 2.8
Contracted Services \| American States Utility Services
Disaggregation of Revenue [Line Items]
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases			50 years
Sales \| Water Service Utility Operations \| Golden State Water Company
Disaggregation of Revenue [Line Items]
Percentage of concentration risk			90.00%
Sales \| Electric Service Utility Operations \| Golden State Water Company
Disaggregation of Revenue [Line Items]
Percentage of concentration risk			90.00%
Minimum \| American States Utility Services
Disaggregation of Revenue [Line Items]
Performance obligation fulfillment period			36 years
Maximum \| American States Utility Services
Disaggregation of Revenue [Line Items]
Performance obligation fulfillment period			50 years

Revenue from Contract with Customer - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 124,182	$ 124,418	$ 325,811	$ 336,423
WRAM under-collection (alternative revenue program)	87,689	91,919	228,834	239,057
Golden State Water Company
Disaggregation of Revenue [Line Items]
Revenues	95,564	99,913	254,382	265,165
WRAM under-collection (alternative revenue program)	87,689	$ 91,919	228,834	$ 239,057
Golden State Water Company \| Water Service Utility Operations
Disaggregation of Revenue [Line Items]
Revenues	87,689		228,834
WRAM under-collection (alternative revenue program)	938		(1,765)
Golden State Water Company \| Electric Service Utility Operations
Disaggregation of Revenue [Line Items]
Revenues	7,875		25,548
BRRAM over-collection (alternative revenue program)	394		645
American States Utility Services \| Contracted Services
Disaggregation of Revenue [Line Items]
Contracted services	28,618		71,429
American States Utility Services \| Contracted Services \| Water
Disaggregation of Revenue [Line Items]
Contracted services	16,909		44,134
American States Utility Services \| Contracted Services \| Wastewater
Disaggregation of Revenue [Line Items]
Contracted services	11,709		27,295
Billed Revenues \| Golden State Water Company \| Water Service Utility Operations
Disaggregation of Revenue [Line Items]
Revenues	88,627		227,069
Billed Revenues \| Golden State Water Company \| Water Service Utility Operations \| Tariff-based revenues
Disaggregation of Revenue [Line Items]
Revenues	87,204		223,230
Billed Revenues \| Golden State Water Company \| Water Service Utility Operations \| CPUC-approved surcharges (cost-recovery activities)
Disaggregation of Revenue [Line Items]
Revenues	937		2,458
Billed Revenues \| Golden State Water Company \| Water Service Utility Operations \| Other
Disaggregation of Revenue [Line Items]
Revenues	486		1,381
Billed Revenues \| Golden State Water Company \| Electric Service Utility Operations
Disaggregation of Revenue [Line Items]
Revenues	8,269		26,193
Billed Revenues \| Golden State Water Company \| Electric Service Utility Operations \| Tariff-based revenues
Disaggregation of Revenue [Line Items]
Revenues	8,207		26,021
Billed Revenues \| Golden State Water Company \| Electric Service Utility Operations \| CPUC-approved surcharges (cost-recovery activities)
Disaggregation of Revenue [Line Items]
Revenues	$ 62		$ 172

Revenue from Contract with Customer - Contract Assets and Contract Liabilities (Details) - American States Utility Services - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Receivable from the U.S. government	$ 54,968	$ 40,150
Contract assets	19,043	30,388
Contract liabilities	$ 8,942	$ 3,911
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Performance obligation fulfillment period	36 years
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Performance obligation fulfillment period	50 years
Contracted Services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases	50 years

Regulatory Matters: (Details) - USD ($)	3 Months Ended		9 Months Ended
Regulatory Matters: (Details) - USD ($)	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Regulatory matters:
Regulatory asset not accruing carrying costs	$ 59,600,000		$ 59,600,000
Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account
Regulatory matters:
Increase (Decrease) in Other Regulatory Assets			12,200,000
Pensions and other post-retirement obligations (Note 8)
Regulatory matters:
Regulatory asset not accruing carrying costs	33,500,000		33,500,000
Derivative unrealized loss (Note 5)
Regulatory matters:
Regulatory asset not accruing carrying costs	$ 1,143,000		$ 1,143,000
Cost of Capital, Proceeding for Water Regions [Member]
Regulatory matters:
Weighted Cost of Capital Percent	8.34%		8.34%
Settlement Agreement Proposed Authorized Return on Equity Percentage	9.43%		9.43%
Various refunds to customers
Regulatory matters:
Decrease in revenues requirement to reflect the newly adopted Cost of Capital for GSWC			$ 955,000
Golden State Water Company
Regulatory matters:
Regulatory assets	$ (21,636,000)		$ (21,636,000)		$ 2,042,000
Golden State Water Company \| Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account
Regulatory matters:
Investment Term			90 days
Regulatory Asset Amount Billed to Customers as Surcharges	7,700,000	$ 11,400,000	$ 17,500,000	$ 24,800,000
Regulatory assets	24,264,000		24,264,000		29,556,000
Golden State Water Company \| Costs deferred for future recovery on Aerojet case
Regulatory matters:
Regulatory assets	9,809,000		9,809,000		10,656,000
Golden State Water Company \| Pensions and other post-retirement obligations (Note 8)
Regulatory matters:
Regulatory assets	31,066,000		31,066,000		33,019,000
Golden State Water Company \| Derivative unrealized loss (Note 5)
Regulatory matters:
Regulatory assets					2,941,000
Golden State Water Company \| Low income rate assistance balancing accounts
Regulatory matters:
Regulatory assets	3,660,000		3,660,000		5,972,000
Golden State Water Company \| General rate case memorandum accounts
Regulatory matters:
Regulatory assets	6,798,000		6,798,000		10,522,000
Golden State Water Company \| Other regulatory assets
Regulatory matters:
Regulatory assets	15,506,000		15,506,000		14,875,000
Golden State Water Company \| Excess deferred income taxes (Note 7)
Regulatory matters:
Regulatory assets	81,912,000		81,912,000		(83,231,000)
Golden State Water Company \| Flow-through taxes, net (Note 7)
Regulatory matters:
Regulatory assets	(15,816,000)		(15,816,000)		(17,716,000)
Golden State Water Company \| Tax Cuts and Jobs Act (Tax Act) memorandum accounts
Regulatory matters:
Adjustments recorded to revalue deferred taxes as a result of the tax cut and job act of 2017 impact	944,000		7,400,000
Golden State Water Company \| Water Revenue Adjustment Mechanism [Member]
Regulatory matters:
Regulatory assets	3,400,000		3,400,000
Golden State Water Company \| Modified Cost Balancing Account [Member]
Regulatory matters:
Regulatory assets	$ 20,900,000		$ 20,900,000
Golden State Water Company \| Cost of Capital, Proceeding for Water Regions [Member]
Regulatory matters:
Return on Equity Percentage	8.90%		8.90%
Weighted Cost of Capital Percent	7.91%		7.91%
Golden State Water Company \| Tax Cuts and Jobs Act (Tax Act) memorandum accounts
Regulatory matters:
Regulatory assets	$ (8,274,000)		$ (8,274,000)		0
Golden State Water Company \| Various refunds to customers
Regulatory matters:
Regulatory assets	(7,880,000)		(7,880,000)		$ (4,552,000)
Decrease in revenues requirement to reflect the newly adopted Cost of Capital for GSWC			3,600,000
Electric Service Utility Operations \| Tax Cuts and Jobs Act (Tax Act) memorandum accounts
Regulatory matters:
Adjustments recorded to revalue deferred taxes as a result of the tax cut and job act of 2017 impact	$ 125,000		$ 848,000
Electric Service Utility Operations \| Pending General Rate Case [Member]
Regulatory matters:
Return on Equity Percentage	9.60%		9.60%
Settlement Agreement Proposed Authorized Return on Equity Percentage	9.95%		9.95%
Maximum \| Golden State Water Company \| Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account
Regulatory matters:
Regulatory Asset Recovery Periods			24 months
Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues			24 years
Minimum \| Golden State Water Company \| Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account
Regulatory matters:
Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues			12 months

Regulatory Matters: CPUC Rehearing Matter and Procurement Audits (Details) - Golden State Water Company - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Regulatory matters:
Net Regulatory Assets	$ (21,636)	$ 2,042
Water Revenue Adjustment Mechanism [Member]
Regulatory matters:
Net Regulatory Assets	3,400
General rate case memorandum accounts
Regulatory matters:
Net Regulatory Assets	$ 6,798	$ 10,522

Earnings per Share/Capital Stock: (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2018

Sep. 30, 2017

Sep. 30, 2018

Sep. 30, 2017

Basic

Net income

$ 22,952

$ 21,006

$ 50,082

$ 56,499

Less: (a) Distributed earnings to common shareholders

10,102

9,349

28,831

27,064

Less: Distributed earnings to participating securities

151

139

Undistributed earnings

12,796

11,607

21,100

29,296

(b) Undistributed earnings allocated to common shareholders

12,727

11,546

20,991

29,147

Undistributed earnings allocated to participating securities

109

149

Common shareholders earnings, basic

$ 22,829

$ 20,895

$ 49,822

$ 56,211

Weighted average Common Shares outstanding, basic

36,737

36,659

36,728

36,625

Basic earnings per Common Share (in dollars per share)

$ 0.62

$ 0.57

$ 1.36

$ 1.53

Diluted

Common shareholders earnings, basic

$ 22,829

$ 20,895

$ 49,822

$ 56,211

Undistributed earnings for dilutive stock-based awards

109

149

Total common shareholders earnings, diluted

$ 22,898

$ 20,956

$ 49,931

$ 56,360

Weighted average Common Shares outstanding, basic

36,737

36,659

36,728

36,625

Stock-based compensation (in shares)

^[1]

213

197

207

188

Weighted average common shares outstanding, diluted

36,950

36,856

36,935

36,813

Diluted earnings per Common Share (in dollars per share)

$ 0.62

$ 0.57

$ 1.35

$ 1.53

[1]

In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 47,792 and 70,702 stock options at September 30, 2018 and 2017, respectively, were deemed to be outstanding in accordance with the accounting guidance on earnings per share. All of the 198,613 and 195,457 restricted stock units at September 30, 2018 and 2017, respectively, were included in the calculation of diluted EPS for the three and nine months ended September 30, 2018 and 2017.

Earnings per Share/Capital Stock: (Details 2) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Additional disclosure
Options outstanding (in shares)	47,792	70,702	47,792	70,702
Anti-dilutive stock options not included in the computation of diluted EPS (in shares)	0		0	0
Common Shares issued under DRP and the 2000 and 2008 Employee Plans			64,245	107,815
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans			$ 348	$ 884
Less: (a) Distributed earnings to common shareholders	$ 10,102	$ 9,349	28,831	27,064
Dividends paid			$ 28,831	$ 27,064
Quarterly dividends paid, per share of common stock (in dollars per share)	$ 0.275	$ 0.255	$ 0.785	$ 0.739
Restricted Stock Units
Additional disclosure
Restricted stock units outstanding (in shares)	198,613	195,457	198,613	195,457

Derivative Instruments (Details) - Golden State Water Company MWh in Thousands, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($) quote	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) MWh quote	Sep. 30, 2017 USD ($)	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Description of derivative activity volume \| MWh			123
Commodity Contract
Derivative Instruments, Gain (Loss) [Line Items]
Number of broker quotes received to determine fair value of derivative instrument \| quote	1		1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of the period	$ (1,710)	$ (4,493)	$ (2,941)	$ (4,901)
Unrealized gain on purchased power contracts	567	656	1,798	1,064
Fair value at end of the period	$ (1,143)	$ (3,837)	$ (1,143)	$ (3,837)
Minimum \| Commodity Contract
Derivative Instruments, Gain (Loss) [Line Items]
Term of derivative contract					3 years
Maximum \| Commodity Contract
Derivative Instruments, Gain (Loss) [Line Items]
Term of derivative contract					5 years

Fair Value of Financial Instruments: (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Golden State Water Company \| Carrying Amount
Financial liabilities:
Long-term debt - GSWC	$ 324,978	$ 325,265
Golden State Water Company \| Fair Value
Financial liabilities:
Long-term debt - GSWC	389,438	$ 424,042
Mutual Funds \| Fair Value, Inputs, Level 1
Financial liabilities:
Rabbi trust fair value of investments held	$ 17,800

Income Taxes: (Details)	3 Months Ended		9 Months Ended
Income Taxes: (Details)	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Golden State Water Company
Effective income tax rate
ETRs (as a percent)	23.20%	38.40%	22.50%	38.60%
Parent
Effective income tax rate
ETRs (as a percent)	23.20%	37.30%	21.70%	37.30%

Employee Benefit Plans: (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Employee Benefit Plans: (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Components of Net Periodic Benefits Cost:
Contributions by employer			$ 6,000
Pension Benefits
Components of Net Periodic Benefits Cost:
Service cost	$ 1,335	$ 1,250	4,005	$ 3,750
Interest cost	1,912	1,976	5,736	5,928
Expected return on plan assets	(2,793)	(2,428)	(8,379)	(7,278)
Amortization of prior service cost (benefit)	0	0	0	0
Amortization of actuarial (gain) loss	314	231	942	693
Net periodic pension cost under accounting standards	768	1,029	2,304	3,093
Regulatory adjustment — deferred	0	(266)	0	(791)
Total expense recognized, before surcharges and allocation to overhead pool	768	1,295	2,304	3,884
Pension Benefits \| Golden State Water Company
Components of Net Periodic Benefits Cost:
Regulatory adjustment — deferred			2,500
Other Postretirement Benefits
Components of Net Periodic Benefits Cost:
Service cost	48	53	162	171
Interest cost	75	73	219	243
Expected return on plan assets	(123)	(107)	(369)	(351)
Amortization of prior service cost (benefit)	0	0	0	0
Amortization of actuarial (gain) loss	(212)	(242)	(576)	(582)
Net periodic pension cost under accounting standards	(212)	(223)	(564)	(519)
Regulatory adjustment — deferred	0	0	0	0
Total expense recognized, before surcharges and allocation to overhead pool	(212)	(223)	(564)	(519)
SERP
Components of Net Periodic Benefits Cost:
Service cost	274	232	822	696
Interest cost	222	223	666	669
Expected return on plan assets	0	0	0	0
Amortization of prior service cost (benefit)	0	3	0	9
Amortization of actuarial (gain) loss	262	194	786	582
Net periodic pension cost under accounting standards	758	652	2,274	1,956
Regulatory adjustment — deferred	0	0	0	0
Total expense recognized, before surcharges and allocation to overhead pool	$ 758	$ 652	$ 2,274	$ 1,956

Contingencies and Gain on Sale of Assets (Details)		9 Months Ended
Contingencies and Gain on Sale of Assets (Details)	Jun. 08, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Loss Contingencies [Line Items]
Proceeds from sale of assets		$ 63,000	$ 34,324,000
Amount spent in clean-up and remediation activities		1,500,000
Golden State Water Company
Loss Contingencies [Line Items]
Proceeds from sale of assets		0	34,324,000
Environmental remediation expense		5,400,000
Environmental Clean-Up and Remediation \| Golden State Water Company
Loss Contingencies [Line Items]
Accrued liability for the estimated additional cost to complete the clean-up at the site		$ 1,300,000
Ojai Water System
Loss Contingencies [Line Items]
Loss contingency number of customers served	2,900
Ojai Water System \| Golden State Water Company
Loss Contingencies [Line Items]
Proceeds from sale of assets	$ 34,300,000
Gain (loss) on sale of properties			$ 8,300,000

Business Segments: (Details) $ in Thousands	3 Months Ended		9 Months Ended
Business Segments: (Details) $ in Thousands	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Details of reportable segment
Revenues	$ 124,182	$ 124,418	$ 325,811	$ 336,423
Operating income (loss)	33,975	38,534	78,234	105,136
Interest expense, net	5,307	5,454	16,106	16,406
Utility plant	1,262,915	1,181,616	1,262,915	1,181,616	$ 1,204,992
Depreciation and amortization expense	10,118	9,854	29,794	29,184
Income tax expense (benefit)	6,939	12,508	13,890	33,670
Capital additions	28,546	32,000	$ 87,328	77,896
AWR
Details of reportable segment
Number of reportable segments \| segment			3
Golden State Water Company
Details of reportable segment
Revenues	95,564	99,913	$ 254,382	265,165
Number of reportable segments \| segment			2
Operating income (loss)	27,540	32,986	$ 66,482	90,091
Utility plant	1,249,190		1,249,190		$ 1,197,940
Depreciation and amortization expense	9,623	9,509	28,387	28,341
Income tax expense (benefit)	5,414	10,813	11,743	29,235
Golden State Water Company \| Water Service Utility Operations
Details of reportable segment
Revenues	87,689		228,834
Golden State Water Company \| Electric
Details of reportable segment
Revenues	7,875		25,548
Reportable Legal Entities \| Golden State Water Company \| Water Service Utility Operations
Details of reportable segment
Revenues	87,689	91,919	228,834	239,057
Operating income (loss)	26,710	31,408	62,012	84,200
Interest expense, net	5,039	4,974	15,095	14,924
Utility plant	1,187,786	1,117,674	1,187,786	1,117,674
Depreciation and amortization expense	9,058	8,972	26,693	26,731
Income tax expense (benefit)	5,247	10,544	10,805	27,739
Capital additions	24,590	30,536	75,976	74,113
Reportable Legal Entities \| Golden State Water Company \| Electric
Details of reportable segment
Revenues	7,875	7,994	25,548	26,108
Operating income (loss)	830	1,578	4,470	5,891
Interest expense, net	291	346	1,014	1,071
Utility plant	61,404	57,669	61,404	57,669
Depreciation and amortization expense	565	537	1,694	1,610
Income tax expense (benefit)	167	269	938	1,496
Capital additions	1,140	559	3,264	2,260
Reportable Legal Entities \| American States Utility Services \| Contracted Services
Details of reportable segment
Revenues	28,618	24,505	71,429	71,258
Operating income (loss)	6,437	5,551	11,759	15,055
Interest expense, net	(118)	58	(255)	214
Utility plant	13,725	6,273	13,725	6,273
Depreciation and amortization expense	495	345	1,407	843
Income tax expense (benefit)	1,606	1,944	2,865	5,152
Capital additions	2,816	905	8,088	1,523
Intersegment Eliminations \| AWR
Details of reportable segment
Revenues	0	0	0	0
Operating income (loss)	(2)	(3)	(7)	(10)
Interest expense, net	95	76	252	197
Utility plant	0	0	0	0
Depreciation and amortization expense	0	0	0	0
Income tax expense (benefit)	(81)	(249)	(718)	(717)
Capital additions	$ 0	$ 0	$ 0	$ 0

Business Segments: (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Business Segments: (Details 2) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Details of reportable segment
Income tax expense (benefit)	$ 6,939	$ 12,508	$ 13,890	$ 33,670
Net property, plant and equipment	1,262,915	1,181,616	1,262,915	1,181,616	$ 1,204,992
Other assets	202,127	304,870	202,127	304,870
Total Assets	1,465,042	1,486,486	1,465,042	1,486,486	1,416,734
Golden State Water Company
Details of reportable segment
Income tax expense (benefit)	5,414	10,813	11,743	29,235
Depreciation on transportation equipment	58	$ 61	179	$ 181
Net property, plant and equipment	1,249,190		1,249,190		1,197,940
Total Assets	$ 1,364,729		$ 1,364,729		$ 1,326,823