Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2019	Aug. 02, 2019
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	001-14431
Entity Registrant Name	American States Water Co
Entity Incorporation, State or Country Code	CA
Entity Tax Identification Number	95-4676679
Entity Address, Address Line One	630 E. Foothill Blvd
Entity Address, City or Town	San Dimas
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	91773-1212
City Area Code	909
Local Phone Number	394-3600
Title of 12(b) Security	Common shares
Trading Symbol	AWR
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		36,831,867
Entity Central Index Key	0001056903
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
GOLDEN STATE WATER COMPANY
Entity Information [Line Items]
Entity File Number	001-12008
Entity Registrant Name	Golden State Water Co
Entity Incorporation, State or Country Code	CA
Entity Tax Identification Number	95-1243678
Entity Address, Address Line One	630 E. Foothill Blvd
Entity Address, City or Town	San Dimas
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	91773-1212
City Area Code	909
Local Phone Number	394-3600
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		165
Entity Central Index Key	0000092116
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2

CONSOLIDATED BALANCE SHEETS - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment
Regulated utility plant, at cost	$ 1,898,157,000	$ 1,832,336,000
Non-utility property, at cost	30,201,000	25,829,000
Total	1,928,358,000	1,858,165,000
Less - Accumulated depreciation	(572,695,000)	(561,855,000)
Net property, plant and equipment	1,355,663,000	1,296,310,000
Other Property and Investments
Goodwill	1,116,000	1,116,000
Other property and investments	27,312,000	25,356,000
Total other property and investments	28,428,000	26,472,000
Current Assets
Cash and cash equivalents	1,516,000	7,141,000
Accounts receivable - customers, less allowance for doubtful accounts	24,245,000	23,395,000
Unbilled receivable	18,064,000	23,588,000
Receivable from the U.S. government	20,949,000	21,543,000
Other accounts receivable, less allowance for doubtful accounts	3,065,000	3,103,000
Income taxes receivable	1,545,000	2,164,000
Materials and supplies, at average cost	6,189,000	5,775,000
Regulatory assets — current	13,671,000	16,527,000
Prepayments and other current assets	7,005,000	6,063,000
Contract assets	25,776,000	22,169,000
Total current assets	122,025,000	131,468,000
Other Assets
Receivable from the U.S. government	38,910,000	39,583,000
Contract assets	5,781,000	2,278,000
Operating lease right-of-use assets	11,058,000	0
Other	5,418,000	5,322,000
Total regulatory and other assets	61,167,000	47,183,000
Total Assets	1,567,283,000	1,501,433,000
Capitalization
Common Stock, Value, Issued	254,969,000	253,689,000
Earnings reinvested in the business	323,818,000	304,534,000
Total common shareholders’ equity	578,787,000	558,223,000
Long-term debt	281,014,000	281,087,000
Total capitalization	859,801,000	839,310,000
Current Liabilities
Long-term debt — current	339,000	40,320,000
Accounts payable	55,645,000	59,532,000
Income taxes payable	3,104,000	360,000
Accrued other taxes	8,140,000	10,094,000
Accrued employee expenses	12,363,000	13,842,000
Accrued interest	3,109,000	3,865,000
Unrealized loss on purchased power contracts	267,000	311,000
Contract liabilities	11,564,000	7,530,000
Operating lease liabilities	1,808,000	0
Other	10,007,000	10,731,000
Total current liabilities	106,346,000	146,585,000
Other Credits
Notes payable to bank	185,500,000	95,500,000
Advances for construction	63,582,000	66,305,000
Contributions in aid of construction - net	128,898,000	124,385,000
Deferred income taxes	114,418,000	114,216,000
Regulatory liabilities	26,955,000	44,867,000
Unamortized investment tax credits	1,331,000	1,367,000
Accrued pension and other postretirement benefits	59,889,000	57,636,000
Operating lease liabilities	9,548,000	0
Other	11,015,000	11,262,000
Total other credits	601,136,000	515,538,000
Commitments and Contingencies (Note 9)
Total Capitalization and Liabilities	1,567,283,000	1,501,433,000
GOLDEN STATE WATER COMPANY
Property, Plant and Equipment
Total	1,898,157,000	1,832,336,000
Less - Accumulated depreciation	(560,733,000)	(551,244,000)
Net property, plant and equipment	1,337,424,000	1,281,092,000
Other Property and Investments
Total other property and investments	25,225,000	23,263,000
Current Assets
Cash and cash equivalents	541,000	4,187,000
Accounts receivable - customers, less allowance for doubtful accounts	24,245,000	23,395,000
Unbilled receivable	17,234,000	17,892,000
Other accounts receivable, less allowance for doubtful accounts	1,890,000	1,959,000
Income taxes receivable from Parent	0	5,617,000
Materials and supplies, at average cost	5,032,000	4,797,000
Regulatory assets — current	13,671,000	16,527,000
Prepayments and other current assets	5,586,000	5,275,000
Total current assets	68,199,000	79,649,000
Other Assets
Operating lease right-of-use assets	10,432,000	0
Other	5,319,000	5,218,000
Total regulatory and other assets	15,751,000	5,218,000
Total Assets	1,446,599,000	1,389,222,000
Capitalization
Common Stock, Value, Issued	293,345,000	292,412,000
Earnings reinvested in the business	222,179,000	211,163,000
Total common shareholders’ equity	515,524,000	503,575,000
Long-term debt	281,014,000	281,087,000
Total capitalization	796,538,000	784,662,000
Current Liabilities
Long-term debt — current	339,000	40,320,000
Accounts payable	47,022,000	47,865,000
Income taxes payable	276,000	0
Accrued other taxes	7,886,000	9,911,000
Accrued employee expenses	10,708,000	11,910,000
Accrued interest	2,809,000	3,550,000
Unrealized loss on purchased power contracts	267,000	311,000
Operating lease liabilities	1,484,000	0
Other	9,399,000	9,432,000
Total current liabilities	80,190,000	123,299,000
Other Credits
Intercompany payable to Parent	151,289,000	57,289,000
Advances for construction	63,582,000	66,305,000
Contributions in aid of construction - net	128,898,000	124,385,000
Deferred income taxes	117,733,000	118,241,000
Regulatory liabilities	26,955,000	44,867,000
Unamortized investment tax credits	1,331,000	1,367,000
Accrued pension and other postretirement benefits	59,889,000	57,636,000
Operating lease liabilities	9,283,000	0
Other	10,911,000	11,171,000
Total other credits	569,871,000	481,261,000
Commitments and Contingencies (Note 9)
Total Capitalization and Liabilities	$ 1,446,599,000	$ 1,389,222,000

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Common Stock, Shares Authorized	60,000,000	60,000,000
Accounts receivable - customers, allowance for doubtful accounts	$ 845	$ 892
Other accounts receivable, allowance for doubtful accounts	$ 59	$ 59
Common Stock, Shares, Outstanding	36,831,696	36,757,842
GOLDEN STATE WATER COMPANY
Common Stock, Shares Authorized	1,000	1,000
Accounts receivable - customers, allowance for doubtful accounts	$ 845	$ 892
Other accounts receivable, allowance for doubtful accounts	$ 59	$ 59
Common Stock, Shares, Outstanding	165	165

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating Revenues
Water	$ 88,140	$ 76,733	$ 152,863	$ 141,145
Electric	7,408	7,841	18,037	17,673
Contracted services	29,099	22,327	55,480	42,811
Total operating revenues	124,647	106,901	226,380	201,629
Operating Expenses
Water purchased	18,762	16,608	31,902	30,215
Power purchased for pumping	1,982	2,231	3,520	3,924
Groundwater production assessment	4,640	4,534	8,386	9,185
Power purchased for resale	2,391	2,384	6,095	5,792
Supply cost balancing accounts	1,207	(2,029)	(165)	(5,898)
Other operation	7,708	7,782	16,279	15,770
Administrative and general	19,529	20,213	41,201	40,506
Depreciation and amortization	6,655	10,010	17,487	19,676
Maintenance	3,053	3,670	5,619	7,499
Property and other taxes	4,870	4,372	9,766	9,171
ASUS construction	14,532	11,576	26,777	21,548
Gain on sale of assets	(112)	(18)	(112)	(18)
Total operating expenses	85,217	81,333	166,755	157,370
Operating Income	39,430	25,568	59,625	44,259
Other Income and Expenses
Interest expense	(6,282)	(6,048)	(12,599)	(11,971)
Interest income	876	636	1,818	1,172
Other, net	591	579	1,933	621
Total other income and expenses	(4,815)	(4,833)	(8,848)	(10,178)
Income from operations before income tax expense	34,615	20,735	50,777	34,081
Income tax expense	7,831	4,387	11,141	6,951
Net Income	$ 26,784	$ 16,348	$ 39,636	$ 27,130
Weighted Average Number of Common Shares Outstanding (in shares)	36,804	36,733	36,788	36,723
Basic Earnings Per Common Share (in dollars per share)	$ 0.72	$ 0.44	$ 1.07	$ 0.74
Weighted Average Number of Diluted Shares (in shares)	36,963	36,912	36,942	36,896
Fully Diluted Earnings Per Common Share (in dollars per share)	$ 0.72	$ 0.44	$ 1.07	$ 0.73
Dividends Declared Per Common Share (in dollars per share)	$ 0.275	$ 0.255	$ 0.550	$ 0.510
GOLDEN STATE WATER COMPANY
Operating Revenues
Water	$ 88,140	$ 76,733	$ 152,863	$ 141,145
Electric	7,408	7,841	18,037	17,673
Total operating revenues	95,548	84,574	170,900	158,818
Operating Expenses
Water purchased	18,762	16,608	31,902	30,215
Power purchased for pumping	1,982	2,231	3,520	3,924
Groundwater production assessment	4,640	4,534	8,386	9,185
Power purchased for resale	2,391	2,384	6,095	5,792
Supply cost balancing accounts	1,207	(2,029)	(165)	(5,898)
Other operation	6,054	6,419	12,914	12,853
Administrative and general	13,678	15,178	29,772	30,326
Depreciation and amortization	6,006	9,430	15,995	18,764
Maintenance	2,452	3,170	4,365	6,325
Property and other taxes	4,422	4,004	8,835	8,390
Gain on sale of assets	(83)	0	(83)	0
Total operating expenses	61,511	61,929	121,536	119,876
Operating Income	34,037	22,645	49,364	38,942
Other Income and Expenses
Interest expense	(6,001)	(5,857)	(11,999)	(11,616)
Interest income	543	457	951	837
Other, net	545	617	1,950	704
Total other income and expenses	(4,913)	(4,783)	(9,098)	(10,075)
Income from operations before income tax expense	29,124	17,862	40,266	28,867
Income tax expense	6,826	4,214	8,946	6,329
Net Income	$ 22,298	$ 13,648	$ 31,320	$ 22,538

CONSOLIDATED STATEMENTS OF CHANGE IN COMMON SHAREHOLDERS' EQUITY Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Golden State Water Company [Member]	Golden State Water Company [Member] Common Stock [Member]	Golden State Water Company [Member] Retained Earnings [Member]
Balance (in shares) at Dec. 31, 2017		36,681,000			146
Beginning balances at Dec. 31, 2017	$ 529,945	$ 250,124	$ 279,821	$ 474,374	$ 242,181	$ 232,193
Add:
Net income	10,782		10,782	8,890		8,890
Exercise of stock options and other issuance of Common Shares (in shares)		52,000
Exercise of stock options and other issuances of Common Shares	340	$ 340
Stock-based compensation, net of taxes paid from shares withheld from employees related to net share settlements (Note 4)	(181)	(181)		(266)	(266)
Dividend equivalent rights on stock-based awards not paid in cash	56	56		49	49
Deduct:
Dividends on Common Shares	9,362		9,362	9,380		9,380
Dividend equivalent rights on stock-based awards not paid in cash	56		56	49		49
Ending balances at Mar. 31, 2018	531,524	$ 250,339	281,185	473,618	$ 241,964	231,654
Balances (in shares) at Mar. 31, 2018		36,733,000			146
Balance (in shares) at Dec. 31, 2017		36,681,000			146
Beginning balances at Dec. 31, 2017	529,945	$ 250,124	279,821	474,374	$ 242,181	232,193
Add:
Net income	$ 27,130			22,538
Exercise of stock options and other issuance of Common Shares (in shares)	52,712
Ending balances at Jun. 30, 2018	$ 539,210	$ 251,092	288,118	478,536	$ 242,645	235,891
Balances (in shares) at Jun. 30, 2018		36,733,000			146
Balance (in shares) at Mar. 31, 2018		36,733,000			146
Beginning balances at Mar. 31, 2018	531,524	$ 250,339	281,185	473,618	$ 241,964	231,654
Add:
Net income	16,348		16,348	13,648		13,648
Stock-based compensation, net of taxes paid from shares withheld from employees related to net share settlements (Note 4)	705	705		640	640
Dividend equivalent rights on stock-based awards not paid in cash	48	48		41	41
Deduct:
Dividends on Common Shares	9,367		9,367	9,370		9,370
Dividend equivalent rights on stock-based awards not paid in cash	48		48	41		41
Ending balances at Jun. 30, 2018	539,210	$ 251,092	288,118	478,536	$ 242,645	235,891
Balances (in shares) at Jun. 30, 2018		36,733,000			146
Balance (in shares) at Dec. 31, 2018		36,758,000			165
Beginning balances at Dec. 31, 2018	558,223	$ 253,689	304,534	503,575	$ 292,412	211,163
Add:
Net income	12,852		12,852	9,022		9,022
Exercise of stock options and other issuance of Common Shares (in shares)		37,000
Exercise of stock options and other issuances of Common Shares	75	$ 75
Stock-based compensation, net of taxes paid from shares withheld from employees related to net share settlements (Note 4)	463	463		572	572
Dividend equivalent rights on stock-based awards not paid in cash	70	70		60	60
Deduct:
Dividends on Common Shares	10,113		10,113	10,100		10,100
Dividend equivalent rights on stock-based awards not paid in cash	70		70	60		60
Ending balances at Mar. 31, 2019	561,500	$ 254,297	307,203	503,069	$ 293,044	210,025
Balances (in shares) at Mar. 31, 2019		36,795,000			165
Balance (in shares) at Dec. 31, 2018		36,758,000			165
Beginning balances at Dec. 31, 2018	558,223	$ 253,689	304,534	503,575	$ 292,412	211,163
Add:
Net income	$ 39,636			31,320
Exercise of stock options and other issuance of Common Shares (in shares)	73,854
Ending balances at Jun. 30, 2019	$ 578,787	$ 254,969	323,818	515,524	$ 293,345	222,179
Balances (in shares) at Jun. 30, 2019		36,832,000			165
Balance (in shares) at Mar. 31, 2019		36,795,000			165
Beginning balances at Mar. 31, 2019	561,500	$ 254,297	307,203	503,069	$ 293,044	210,025
Add:
Net income	26,784		26,784	22,298		22,298
Exercise of stock options and other issuance of Common Shares (in shares)		37,000
Exercise of stock options and other issuances of Common Shares	291	$ 291
Stock-based compensation, net of taxes paid from shares withheld from employees related to net share settlements (Note 4)	331	331		257	257
Dividend equivalent rights on stock-based awards not paid in cash	50	50		44	44
Deduct:
Dividends on Common Shares	10,119		10,119	10,100		10,100
Dividend equivalent rights on stock-based awards not paid in cash	50		50	44		44
Ending balances at Jun. 30, 2019	$ 578,787	$ 254,969	$ 323,818	$ 515,524	$ 293,345	$ 222,179
Balances (in shares) at Jun. 30, 2019		36,832,000			165

CONSOLIDATED STATEMENTS OF CASH FLOW - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows From Operating Activities:
Net income	$ 39,636	$ 27,130
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,640	19,797
Provision for doubtful accounts	281	322
Deferred income taxes and investment tax credits	(1,703)	(1,565)
Stock-based compensation expense	2,179	1,637
Gain on sale of assets	(112)	(18)
Gain on investments held in a trust	(2,187)	(97)
Other — net	130	136
Changes in assets and liabilities:
Accounts receivable — customers	(1,129)	(835)
Unbilled receivable	5,524	1,730
Other accounts receivable	36	3,612
Receivables from the U.S. government	(2,909)	(14,507)
Materials and supplies	(414)	(569)
Prepayments and other assets	1,901	(1,171)
Contract assets	(2,934)	12,631
Regulatory assets	(13,932)	12,240
Accounts payable	83	(3,473)
Income taxes receivable/payable	3,363	4,820
Contract liabilities	4,034	3,132
Accrued pension and other post-retirement benefits	3,116	2,495
Other liabilities	(7,936)	(2,376)
Net cash provided	44,667	65,071
Cash Flows From Investing Activities:
Capital expenditures	(81,155)	(58,782)
Proceeds from Sale of Property, Plant, and Equipment	102	29
Other investing activities	184	98
Net cash used	(80,869)	(58,655)
Cash Flows From Financing Activities:
Proceeds from stock option exercises	366	340
Receipt of advances for and contributions in aid of construction	6,290	3,343
Refunds on advances for construction	(4,074)	(2,616)
Retirement or repayments of long-term debt	(40,200)	(197)
Net change in notes payable to banks	90,000	18,000
Dividends paid	(20,232)	(18,729)
Other financing activities	1,573	1,214
Net cash provided (used)	30,577	(1,073)
Net change in cash and cash equivalents	(5,625)	5,343
Cash and cash equivalents, beginning of period	7,141	214
Cash and cash equivalents, end of period	1,516	5,557
Non-cash transactions:
Accrued payables for investment in utility plant	23,433	16,016
Property installed by developers and conveyed	1,241	929
GOLDEN STATE WATER COMPANY
Cash Flows From Operating Activities:
Net income	31,320	22,538
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	16,150	18,885
Provision for doubtful accounts	279	331
Deferred income taxes and investment tax credits	(2,432)	(2,192)
Stock-based compensation expense	1,952	1,326
Gain on sale of assets	(83)	0
Gain on investments held in a trust	(2,187)	(97)
Other — net	147	176
Changes in assets and liabilities:
Accounts receivable — customers	(1,129)	(835)
Unbilled receivable	658	745
Other accounts receivable	69	2,830
Materials and supplies	(235)	(107)
Prepayments and other assets	2,135	(460)
Regulatory assets	(13,932)	12,240
Accounts payable	3,127	(2,310)
Intercompany receivable/payable	0	26
Income taxes receivable/payable	5,893	7,606
Accrued pension and other post-retirement benefits	3,116	2,495
Other liabilities	(6,607)	(2,603)
Net cash provided	38,241	60,594
Cash Flows From Investing Activities:
Capital expenditures	(76,660)	(53,510)
Proceeds from Sale of Property, Plant, and Equipment	83	0
Other investing activities	184	98
Net cash used	(76,393)	(53,412)
Cash Flows From Financing Activities:
Receipt of advances for and contributions in aid of construction	6,290	3,343
Refunds on advances for construction	(4,074)	(2,616)
Retirement or repayments of long-term debt	(40,200)	(197)
Net change in intercompany borrowings	94,000	15,000
Dividends paid	(20,200)	(18,750)
Other financing activities	1,310	1,053
Net cash provided (used)	34,506	(4,273)
Net change in cash and cash equivalents	(3,646)	2,909
Cash and cash equivalents, beginning of period	4,187	214
Cash and cash equivalents, end of period	541	3,123
Non-cash transactions:
Accrued payables for investment in utility plant	23,433	16,016
Property installed by developers and conveyed	$ 1,241	$ 929

Summary of Significant Accounting Policies	6 Months Ended
Summary of Significant Accounting Policies	Jun. 30, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies [Text Block]	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 customer connections. GSWC also distributes electricity in several San Bernardino County mountain communities in California serving approximately 24,000 customer connections 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. GSWC filed applications with the CPUC and the Federal Energy Regulatory Commission in December 2018 and July 2019, respectively, to transfer the assets and liabilities of the BVES division of GSWC to Bear Valley Electric Service, Inc., a newly created separate legal entity and stand-alone subsidiary of AWR. This reorganization plan is subject to regulatory approvals and, if approved, is not expected to result in a substantive change to AWR's operations and business segments. The CPUC has scheduled to issue a final decision by the end of 2019. 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 annual economic price adjustments and modifications for changes in circumstances, changes in laws and regulations and additions to the contract value for new construction of facilities at the military bases. 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 stock 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 ("GAAP"). 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, 2018 condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by GAAP. 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, 2018 filed with the SEC. 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 $1.3 million and $1.0 million during the three months ended June 30, 2019 and 2018, and approximately $2.4 million and $2.0 million during the six months ended June 30, 2019 and 2018, respectively. AWR borrows under a credit facility, which expires in May 2023, and provides funds to its subsidiaries, GSWC and ASUS, in support of their operations. In March 2019, AWR amended this credit facility to increase its borrowing capacity from $150.0 million to $200.0 million. As of June 30, 2019, there was $185.5 million outstanding under this facility. The interest rate charged to GSWC and ASUS is sufficient to cover AWR’s interest expense under the credit facility. GSWC Long-Term Debt: In March 2019, GSWC repaid $40.0 million of its 6.70% senior note, which matured in that month. GSWC increased its intercompany borrowings from AWR parent to fund the repayment of this note. GSWC intends to issue up to $115.0 million of long-term debt by the end of 2019 and use the proceeds to reduce its intercompany borrowings and to partially fund capital expenditures. AWR parent intends to use any debt financing proceeds from GSWC to pay down the amounts outstanding under its credit facility. Recently Issued Accounting Pronouncements: Accounting Pronouncements Adopted in 2019 In February 2016, the Financial Accounting Standards Board ("FASB") issued a new lease accounting standard, Leases (Accounting Standards Codification ("ASC") 842), which replaces the prior lease guidance, (ASC 840). 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. Registrant adopted the new lease accounting standard as of January 1, 2019 and did not adjust comparative periods for it. There was no cumulative-effect impact to the opening balance of retained earnings as a result of this adoption. Registrant elected the practical expedient under ASU 2018-01 Land Easement Practical Expedient for Transition to Topic 842 and did not review existing easements entered into prior to January 1, 2019. Leases with terms of twelve months or less were not recorded on the balance sheet. The adoption of the new lease guidance did not have a material impact on Registrant's results of operations or liquidity, but resulted in the recognition of operating lease liabilities and operating lease right-of-use assets on its balance sheets. The adoption of this guidance as of January 1, 2019 resulted in the recognition of $7.6 million in right-of-use assets and $8.0 million in operating lease liabilities (see Note 10). In August 2018, the FASB issued Accounting Standards Update ("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 ASU, entities that enter into cloud computing service arrangements are required to 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. Registrant adopted this guidance effective January 1, 2019. This accounting change did not have a significant impact on Registrant's financial statements. Accounting Pronouncements to be Adopted in Future Periods In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, and issued further guidance in November 2018 and May 2019, related to the impairment of financial instruments, effective January 1, 2020. The new guidance provides an impairment model, known as the current expected credit loss model, which is based on expected credit losses rather than incurred losses over the remaining life of most financial assets measured at amortized cost, including trade and other receivables. Registrant is currently evaluating the impact of this new guidance and do not expect the adoption of the guidance will have a material impact on its financial statements. 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 ASU removes disclosures to pension plans and other post-retirement benefit plans that no longer are considered cost beneficial, clarifies the specific disclosure requirements and adds disclosure requirements deemed relevant. This ASU is effective for fiscal years ending after December 15, 2020 and will be applied by Registrant on a retrospective basis to all periods presented. Registrant is still evaluating the ASU and has not yet determined the effect on the Company's financial statements.

Revenue from Contract with Customer

6 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer

Revenues

Most of Registrant's revenues are derived from contracts with customers, including tariff-based revenues from its regulated utilities. ASUS's 50-year firm fixed-price contracts with the U.S. government are considered service concession arrangements under ASC 853 Service Concession Arrangements. Accordingly, the services under these contracts are accounted for under Topic 606 Revenue from Contracts with Customers and the water and/or wastewater systems are not recorded as Property, Plant and Equipment on Registrant’s balance sheet.

Although GSWC has a diversified base of residential, commercial, industrial and other customers, revenues derived from residential and commercial customers generally account for approximately 90% and 85% of total water and electric revenues, respectively. The vast majority of ASUS's revenues are with the U.S. government. For the three months ended June 30, 2019 and 2018, disaggregated revenues from contracts with customers by segment were as follows:



	Three Months Ended June 30,						Six Months Ended June 30,
(dollar in thousands)	2019			2018			2019			2018
Water:
Tariff-based revenues	$	76,876		$	70,251		$	136,451		$	136,026
Surcharges (cost-recovery activities)	763			728			1,054			1,521
Other	461			453			920			895
Water revenues from contracts with customers	78,100			71,432			138,425			138,442
WRAM under-collection (alternative revenue program)	10,040			5,301			14,438			2,703
Total water revenues	88,140			76,733			152,863			141,145

Electric:
Tariff-based revenues	7,698			7,795			18,964			17,814
Surcharges (cost-recovery activities)	43			63			97			110
Electric revenues from contracts with customers	7,741			7,858			19,061			17,924
BRRAM over-collection (alternative revenue program)	(333		)	(17		)	(1,024		)	(251		)
Total electric revenues	7,408			7,841			18,037			17,673

Contracted services:
Water	14,620			14,233			27,975			27,233
Wastewater	14,479			8,094			27,505			15,578
Contracted services revenues from contracts with customers	29,099			22,327			55,480			42,811

Total revenues	$	124,647		$	106,901		$	226,380		$	201,629

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, were as follows:



(dollar in thousands)	June 30, 2019		January 1, 2019

Receivable from the U.S. government	$	59,859	$	61,126
Contract assets	$	31,557	$	24,447
Contract liabilities	$	11,564	$	7,530

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 six months ended June 30, 2019, which was included in contract liabilities at the beginning of the period were $1.7 million and $1.3 million, respectively. Contracted services revenues recognized during the three months ended June 30, 2019 from performance obligations satisfied in previous periods were not material.

As of June 30, 2019, Registrant's aggregate remaining performance obligations, which are entirely for the contracted services segment, were $3.2 billion. Registrant expects to recognize revenue on these remaining performance obligations over the remaining term of each of the 50-year contracts, which range from 35 to 49 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 convenience of the U.S. government.

Regulatory Matters

6 Months Ended

Jun. 30, 2019

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 June 30, 2019, Registrant had approximately $55.7 million of regulatory liabilities, net of regulatory assets, not accruing carrying costs. Of this amount, (i) $80.7 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) $14.2 million of regulatory liabilities are from flowed-through deferred income taxes, (iii) $35.3 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) $267,000 of regulatory assets relates to a memorandum account authorized by the CPUC to track unrealized gains and losses on BVES's purchase power contracts over the term of the contracts. The remainder of regulatory assets relates to other items that do not provide for or incur carrying costs.

Regulatory assets represent costs incurred by GSWC for which it has received or expects to receive rate recovery in the future. In determining the probability of costs being recognized in other periods, GSWC considers regulatory rules and decisions, past practices, and other facts or circumstances that would indicate if recovery is probable. If the CPUC determines that a portion of GSWC’s assets are not recoverable in customer rates, GSWC must determine if it has suffered an asset impairment that requires it to write down the asset's value. Regulatory assets are offset against regulatory liabilities within each ratemaking area. Amounts expected to be collected or refunded in the next twelve 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)	June 30, 2019			December 31, 2018
GSWC
Water Revenue Adjustment Mechanism and Modified Cost Balancing Account	$	30,522		$	17,763
Costs deferred for future recovery on Aerojet case	9,166			9,516
Pensions and other post-retirement obligations (Note 8)	32,444			33,124
Derivative unrealized loss (Note 5)	267			311
Low income rate assistance balancing accounts	1,787			2,784
General rate case memorandum accounts	8,025			5,054
Excess deferred income taxes	(80,690		)	(81,465		)
Flow-through taxes, net	(14,160		)	(15,273		)
Other regulatory assets	17,700			15,656
Tax Cuts and Jobs Act memorandum accounts	(8,987		)	(8,293		)
Various refunds to customers	(9,358		)	(7,517		)
Total	$	(13,284	)	$	(28,340	)

Regulatory matters are discussed in the consolidated financial statements and the notes thereto included in the Form 10-K for the year ended December 31, 2018 filed with the SEC. The discussion below focuses on significant matters and developments since December 31, 2018.

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. The change in net regulatory liabilities as of June 30, 2019 as compared to December 31, 2018 is mainly due to an increase in the under-collection balance in the WRAM and MCBA accounts as a result of a decrease in water customer usage.

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, 2018. For the three months ended June 30, 2019 and 2018, surcharges (net of surcredits) of approximately $832,000 and $5.6 million, respectively, were billed to customers to recover previously incurred under-collections in the WRAM/MCBA accounts. For the six months ended June 30, 2019 and 2018, surcharges (net of surcredits) of approximately $3.6 million and $9.8 million, respectively, were billed to customers to recover previously incurred under-collections in the WRAM/MCBA accounts. During the six months ended June 30, 2019, GSWC recorded additional net under-collections in the WRAM/MCBA accounts of approximately $16.4 million due to lower-than-adopted water usage, as well as higher-than-adopted supply costs currently in billed customer rates. As of June 30, 2019, GSWC had an aggregated regulatory asset of $30.5 million, which is comprised of a $19.7 million under-collection in the WRAM accounts and a $10.8 million under-collection in the MCBA accounts.

General Rate Case Filings and Other Matters:

Water Segment:

In July 2017, GSWC filed a general rate case application for all of its water regions and the general office to determine new rates for the years 2019 - 2021. On May 30, 2019, the CPUC issued a final decision on GSWC's water general rate case with rates retroactive to January 1, 2019. Among other things, the final decision approves in its entirety a settlement agreement that had been entered into between GSWC and the CPUC’s Public Advocates Office in August 2018. As a result, the final decision authorizes GSWC to invest approximately $334.5 million in capital expenditures over the rate cycle. The $334.5 million of infrastructure investment includes $20.4 million of capital projects to be filed for revenue recovery through advice letters when those projects are completed.

As a result of the May 2019 CPUC decision, GSWC implemented new water rates on June 8, 2019. Due to the delay in receiving a final decision by the CPUC, billed water revenues up to June 8, 2019 were based on 2018 adopted rates. The new rates are retroactive to January 1, 2019 and, as a result, the cumulative retroactive impact of the CPUC decision was recorded during the second quarter of 2019, primarily affecting water revenues, supply costs and depreciation expense. Accordingly, GSWC added approximately $5.6 million to the general rate case memorandum accounts regulatory asset representing the rate difference between interim rates and final rates authorized by the CPUC retroactive to January 1, 2019. Surcharges will be implemented to recover the retroactive rate difference over approximately 12 - 24 months. The final decision also approved the recovery of previously incurred costs that were being tracked in CPUC-authorized memorandum accounts, which resulted in a reduction to administrative and general expense of approximately $1.1 million, which was also recorded during the second quarter of 2019.

In December 2017, the Tax Cuts and Jobs Act ("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 was 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 adopted revenue requirement was tracked in a memorandum account effective January 1, 2018. On July 1, 2018, new lower water rates, which incorporated the new federal income tax rate, were implemented for all water ratemaking areas. As a result of receiving the May 2019 CPUC final decision on the water general rate case, in July 2019 GSWC filed with the CPUC to refund $7.2 million of over-collections recorded in this tax memorandum account as a one-time surcredit once approved.

Electric Segment:

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. In November 2018, GSWC and the Public Advocates Office filed a joint motion to adopt a settlement agreement between the two parties resolving all issues in connection with the general rate case. On July 16, 2019, the assigned Administrative Law Judge issued a proposed decision ("PD") on the general rate case. The PD approves the November 2018 settlement agreement in its entirety, which among other things, extends the rate cycle by one year (new rates will be effective for 2018-2022). Because of the delay in finalizing the electric general rate case, billed electric revenues during the first six months of 2019, and all of 2018, were based on 2017 adopted rates pending a final decision by the CPUC in the rate case application. When approved by the CPUC, the new rates will be retroactive to January 1, 2018 and retroactive adjustments will be recorded accordingly. A final decision is expected during the third or fourth quarter of 2019.

On July 12, 2019, the Governor of California signed Assembly Bill No. 1054 (“AB 1054”), the provisions of which took effect immediately. Among other things, AB 1054 provides a framework for electrical corporations to recover costs and expenses arising from a covered wildfire, as defined, and to allow cost recovery from ratepayers in particular circumstances. The bill also establishes a Wildfire Fund to pay eligible claims arising from a covered wildfire under certain circumstances. The Wildfire Fund is expected to be funded partially by electrical corporation shareholders, and partly by ratepayers. If the Company decides to participate in the Wildfire Fund, it has until September 10, 2019 to make the initial contribution. At this time, a decision has not been made.

Earnings per Share/Capital Stock

6 Months Ended

Jun. 30, 2019

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, and 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 June 30,				For the Six Months Ended June 30,
(in thousands, except per share amounts)	2019		2018		2019		2018
Net income	$	26,784	$	16,348	$	39,636	$	27,130
Less: (a) Distributed earnings to common shareholders	10,119		9,367		20,232		18,729
Distributed earnings to participating securities	46		51		88		96
Undistributed earnings	16,619		6,930		19,316		8,305

(b) Undistributed earnings allocated to common shareholders	16,543		6,894		19,232		8,263
Undistributed earnings allocated to participating securities	76		36		84		42
Total income available to common shareholders, basic (a)+(b)	$	26,662	$	16,261	$	39,464	$	26,992

Weighted average Common Shares outstanding, basic	36,804		36,733		36,788		36,723
Basic earnings per Common Share	$	0.72	$	0.44	$	1.07	$	0.74

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 June 30, 2019 and 2018, there were 11,556 and 47,792 options outstanding, respectively, under these plans. At June 30, 2019 and 2018, there were also 170,372 and 204,909 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 June 30,				For the Six Months Ended June 30,
(in thousands, except per share amounts)	2019		2018		2019		2018
Common shareholders earnings, basic	$	26,662	$	16,261	$	39,464	$	26,992
Undistributed earnings for dilutive stock-based awards	75		36		84		42
Total common shareholders earnings, diluted	$	26,737	$	16,297	$	39,548	$	27,034

Weighted average common shares outstanding, basic	36,804		36,733		36,788		36,723
Stock-based compensation (1)	159		179		154		173
Weighted average common shares outstanding, diluted	36,963		36,912		36,942		36,896

Diluted earnings per Common Share	$	0.72	$	0.44	$	1.07	$	0.73

(1) In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 11,556 and 47,792 stock options at June 30, 2019 and 2018, respectively, were deemed to be outstanding in accordance with accounting guidance on earnings per share. All of the 170,372 and 204,909 restricted stock units at June 30, 2019 and 2018, respectively, were included in the calculation of diluted EPS for the three and six months ended June 30, 2019 and 2018.

No stock options outstanding at June 30, 2019 had an exercise price greater than the average market price of AWR’s Common Shares for the three and six months ended June 30, 2019. There were no stock options outstanding at June 30, 2019 or 2018 that were anti-dilutive.

During the six months ended June 30, 2019 and 2018, AWR issued 73,854 and 52,712 common shares, for approximately $366,000 and $340,000, respectively, under Registrant’s Common Share Purchase and Dividend Reinvestment Plan, the 401(k) Plan, the stock incentive plans for employees, and the non-employee directors stock plans.

During the six months ended June 30, 2019 and 2018, AWR paid $1.6 million and $1.2 million, respectively, to taxing authorities on employees' behalf for shares withheld related to net share settlements. During the six months ended June 30, 2019 and 2018, GSWC paid $1.3 million and $1.1 million, respectively, to taxing authorities on employees' behalf for shares withheld related to net share settlements. These payments are included in the stock-based compensation caption of the statements of equity.

During the three months ended June 30, 2019 and 2018, AWR paid quarterly dividends of approximately $10.1 million, or $0.275 per share, and $9.4 million, or $0.255 per share, respectively. During the six months ended June 30, 2019 and 2018, AWR paid quarterly dividends of approximately $20.2 million, or $0.550 per share, and $18.7 million, or $0.51 per share, respectively.

During the three months ended June 30, 2019 and 2018, GSWC paid dividends of $10.1 million and $9.4 million respectively, to AWR. During the six months ended June 30, 2019 and 2018, GSWC paid dividends of $20.2 million and $18.8 million respectively, to AWR.

Derivative Instruments

6 Months Ended

Jun. 30, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments

GSWC's electric division, BVES, purchases power under long-term contracts at a fixed cost depending on the amount of power and the period during which the power is purchased under such contracts. In December 2014, the CPUC approved an application that allowed BVES to enter into long-term purchased power contracts with energy providers, which BVES executed in December 2014. BVES began taking power under these long-term contracts effective January 1, 2015 at a fixed cost over three and five year terms depending on the amount of power and period during which the power is purchased under the contracts.

The long-term contracts executed in December 2014 are subject to the accounting guidance for derivatives and require mark-to-market derivative accounting. Among other things, the CPUC also authorized BVES to establish a regulatory asset and liability memorandum account to offset the mark-to-market entries required by the accounting guidance. Accordingly, all unrealized gains and losses generated from the purchased power contracts executed in December 2014 are deferred on a monthly basis into a non-interest bearing regulatory memorandum account that tracks the changes in fair value of the derivative throughout the term of the contract. As a result, these unrealized gains and losses do not impact GSWC’s earnings. The three year contract expired on December 31, 2017, and the five year term contract expires in November 2019. Registrant has received preliminary bids for new purchase power contracts and has filed an application with the CPUC to authorize GSWC to proceed with final bidding and selection. A final decision from the CPUC, as well as the execution of new purchase power contracts, is expected by the end of 2019. As of June 30, 2019, there was a $267,000 unrealized loss in the memorandum account for the purchased power contracts as a result of a drop in energy prices. The notional volume of derivatives remaining under these long-term contracts as of June 30, 2019 was 44,064 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 this derivative instrument were estimated based on independent sources such as broker quotes and publications that are not observable in or corroborated by the market. Registrant received one broker quote to determine the fair value of its derivative 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 six months ended June 30, 2019 and 2018:



	For The Three Months Ended June 30,						For the Six Months Ended June 30,
(dollars in thousands)	2019			2018			2019			2018
Fair value at beginning of the period	$	(336	)	$	(2,625	)	$	(311	)	$	(2,941	)
Unrealized gain on purchased power contracts	69			915			44			1,231
Fair value at end of the period	$	(267	)	$	(1,710	)	$	(267	)	$	(1,710	)

Fair Value of Financial Instruments

6 Months Ended

Jun. 30, 2019

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 these items.

Investments held in a Rabbi Trust for the supplemental executive retirement plan ("SERP") are measured at fair value and totaled $18.5 million as of June 30, 2019. 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 June 30, 2019 and December 31, 2018 were determined using rates for similar financial instruments of the same duration utilizing Level 2 methods and assumptions. The interest rates used for the June 30, 2019 valuation decreased as compared to December 31, 2018, increasing the fair value of long-term debt as of June 30, 2019 after taking into account the repayment of $40.0 million of GSWC's 6.70% senior note in March 2019. Changes in the assumptions will produce different results.



	June 30, 2019				December 31, 2018
(dollars in thousands)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Financial liabilities:
Long-term debt—GSWC (1)	$	284,778	$	372,745	$	324,978	$	387,889

___________________

(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

Contingencies	6 Months Ended
Contingencies	Jun. 30, 2019
Loss Contingencies [Line Items]
Contingencies	Contingencies Environmental Clean-Up and Remediation: GSWC has been involved in environmental remediation and cleanup at a plant site ("Chadron Plant") that contained an underground storage tank which was used to store gasoline for its vehicles. This tank was removed from the ground in July 1990 along with the dispenser and ancillary piping. Since then, GSWC has been involved in various remediation activities at this site. Analysis indicates that off-site monitoring wells may be necessary to document effectiveness of remediation. As of June 30, 2019, the total amount spent to clean up and remediate GSWC’s plant facility was approximately $6.2 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 June 30, 2019, 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 also believes it is probable that the estimated additional costs will be approved in rate base by the CPUC. Other Litigation: Registrant is also subject to other ordinary routine litigation incidental to its business, some of which may include claims for compensatory and punitive damages. Management believes that rate recovery, proper insurance coverage and reserves are in place to insure against, among other things, property, general liability, employment, and workers’ compensation claims incurred in the ordinary course of business. Insurance coverage may not cover certain claims involving punitive damages. However, Registrant does not believe the outcome from any pending suits or administrative proceedings will have a material effect on Registrant's consolidated results of operations, financial position or cash flows.

Leases

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Lessee, Operating Leases [Text Block]

Leases

The adoption of the new lease guidance (see Note 1) effective January 1, 2019 did not have a material impact on Registrant's results of operations or liquidity, but resulted in the recognition of operating lease liabilities and operating lease right-of-use assets on its balance sheets. Right-of-use ("ROU") assets represent the right to use an underlying asset for the lease term, and lease liabilities represent the obligation to make lease payments arising from the lease. ROU assets and liabilities are recognized at the lease commencement date based on the estimated present value of lease payments over the lease term. As of June 30, 2019, Registrant has right-of-use assets of $11.1 million, short-term operating lease liabilities of $1.8 million and long-term operating lease liabilities of $9.5 million.

Significant assumptions and judgments made as part of the adoption of this new lease standard include determining (i) whether a contract contains a lease, (ii) whether a contract involves an identified asset, and (iii) which party to the contract directs the use of the asset. The discount rates used to calculate the present value of lease payments were determined based on hypothetical borrowing rates available to Registrant over terms similar to the lease terms.

Registrant’s leases consist of real estate and equipment leases. Most of these are GSWC's leases. Most of Registrant's leases require fixed lease payments. Some real estate leases have escalation payments which depend on an index. Variable lease costs have not been material. Lease terms used to measure the lease liability include options to extend the lease if the option is reasonably certain to be exercised. Lease and non-lease components were combined to measure lease liabilities. Registrant also has a real estate lease that have not yet commenced as of June 30, 2019. This lease will create additional operating right-of-use assets and operating lease liabilities of approximately $2.2 million upon possession of the office space later in 2019.

GSWC's long-term debt includes $28.0 million of 9.56% private placement notes, which require GSWC to maintain a total indebtedness to capitalization ratio of less than 0.6667-to-1. The indebtedness, as defined in the note agreement, includes any lease liabilities required to be recorded under GAAP. As of June 30, 2019, GSWC had a total indebtedness (including GSWC's lease liabilities) to capitalization ratio of 0.46-to-1. None of the other covenants or restrictions contained in Registrant's long-term debt agreements were affected by the adoption of the new lease standard.

Registrant's supplemental lease information for the three and six months ended June 30, 2019 is as follows (in thousands, except for weighted average data):



	Three Months Ended June 30, 2019			Six Months Ended June 30, 2019

Operating lease costs	$	761		$	1,559
Short-term lease costs	$	106		$	180

Weighted average remaining lease term (in years)	7.81			7.81
Weighted-average discount rate	3.4		%	3.4		%

Non-cash transactions
Lease liabilities arising from obtaining right-of-use assets	$	6,730		$	14,698

During the three months ended June 30, 2019 and 2018, Registrant’s consolidated rent expense was approximately $630,000 and $567,000, respectively, and was approximately $1.3 million and $1.1 million for the six months ended June 30, 2019 and 2018, respectively. Registrant has entered into several new office leases during 2019. Registrant’s future minimum payments under long-term non-cancelable operating leases are as follows (in thousands):



	June 30, 2019		December 31, 2018
2019 (July through December 2019 as of June 30, 2019)	$	1,370	$	2,818
2020	2,293		2,530
2021	2,122		1,497
2022	1,795		1,007
2023	1,337		546
Thereafter	4,615		605
Total lease payments	13,532		$	9,003
Less: imputed interest	2,176
Total lease obligations	11,356
Less: current obligations	1,808
Long-term lease obligations	$	9,548

There is no material difference between the consolidated operations of AWR and the operations of GSWC in regard to the future minimum payments under long-term non-cancelable operating leases.

Business Segments

6 Months Ended

Jun. 30, 2019

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 equity investments in its subsidiaries and note receivables therefrom, and deferred taxes.

All activities of GSWC, a rate-regulated utility, are geographically located within California. Activities of ASUS and its subsidiaries are conducted in California, Georgia, Florida, 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 June 30, 2019
	GSWC							AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS			Parent			AWR
Operating revenues	$	88,140	$	7,408	$	29,099		$	—		$	124,647
Operating income (loss)	33,259		778		5,395			(2		)	39,430
Interest expense, net	5,112		346		(219		)	167			5,406
Utility plant	1,273,962		63,462		18,239			—			1,355,663
Depreciation and amortization expense (1)	5,405		601		649			—			6,655
Income tax expense (benefit)	6,812		14		1,300			(295		)	7,831
Capital additions	36,293		1,254		3,046			—			40,593



	As Of And For The Three Months Ended June 30, 2018
	GSWC							AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS			Parent			AWR
Operating revenues	$	76,733	$	7,841	$	22,327		$	—		$	106,901
Operating income (loss)	21,244		1,401		2,925			(2		)	25,568
Interest expense, net	5,047		353		(71		)	83			5,412
Utility plant	1,166,867		60,504		11,418			—			1,238,789
Depreciation and amortization expense (1)	8,866		564		580			—			10,010
Income tax expense (benefit)	3,909		305		705			(532		)	4,387
Capital additions	24,768		1,150		2,500			—			28,418



	As Of And For The Six Months Ended June 30, 2019
	GSWC							AWR		Consolidated
(dollars in thousands)	Water		Electric		ASUS			Parent		AWR
Operating revenues	$	152,863	$	18,037	$	55,480				$	226,380
Operating income (loss)	46,525		2,839		10,265			(4	)	59,625
Interest expense, net	10,349		699		(580		)	313		10,781
Utility plant	1,273,962		63,462		18,239			—		1,355,663
Depreciation and amortization expense (1)	14,794		1,201		1,492			—		17,487
Income tax expense (benefit)	8,485		461		2,425			(230	)	11,141
Capital additions	74,672		1,988		4,495			—		81,155



	As Of And For The Six Months Ended June 30, 2018
	GSWC							AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS			Parent			AWR
Operating revenues	$	141,145	$	17,673	$	42,811		$	—		$	201,629
Operating income (loss)	35,302		3,640		5,322			(5		)	44,259
Interest expense, net	10,056		723		(137		)	157			10,799
Utility plant	1,166,867		60,504		11,418			—			1,238,789
Depreciation and amortization expense (1)	17,635		1,129		912			—			19,676
Income tax expense (benefit)	5,558		771		1,259			(637		)	6,951
Capital additions	51,386		2,124		5,272			—			58,782

(1) Depreciation computed on GSWC’s transportation equipment is recorded in other operating expenses and totaled $96,000

and $61,000 for the three months ended June 30, 2019 and 2018, respectively, and $154,000 and $121,000 for the six months ended June 30, 2019 and 2018, respectively.

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



	June 30,
	2019		2018
Total utility plant	$	1,355,663	$	1,238,789
Other assets	211,620		202,333
Total consolidated assets	$	1,567,283	$	1,441,122

Summary of Significant Accounting Policies: (Policies)	6 Months Ended
Summary of Significant Accounting Policies: (Policies)	Jun. 30, 2019
Accounting Policies [Abstract]
Basis of Accounting	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 stock 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 ("GAAP"). 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, 2018 condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by GAAP. 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, 2018 filed with the SEC.
GSWC's Related Party Transactions	Related Party Transactions: GSWC and ASUS provide and/or receive various support services to and from their parent, AWR, and among themselves. GSWC also allocates certain corporate office administrative and general costs to its affiliate, ASUS, using allocation factors approved by the CPUC. GSWC allocated corporate office administrative and general costs to ASUS of approximately $1.3 million and $1.0 million during the three months ended June 30, 2019 and 2018, and approximately $2.4 million and $2.0 million during the six months ended June 30, 2019 and 2018, respectively. AWR borrows under a credit facility, which expires in May 2023, and provides funds to its subsidiaries, GSWC and ASUS, in support of their operations. In March 2019, AWR amended this credit facility to increase its borrowing capacity from $150.0 million to $200.0 million. As of June 30, 2019, there was $185.5 million outstanding under this facility. The interest rate charged to GSWC and ASUS is sufficient to cover AWR’s interest expense under the credit facility.
GSWC Long-Term Debt	GSWC Long-Term Debt: In March 2019, GSWC repaid $40.0 million of its 6.70% senior note, which matured in that month. GSWC increased its intercompany borrowings from AWR parent to fund the repayment of this note. GSWC intends to issue up to $115.0 million of long-term debt by the end of 2019 and use the proceeds to reduce its intercompany borrowings and to partially fund capital expenditures. AWR parent intends to use any debt financing proceeds from GSWC to pay down the amounts outstanding under its credit facility.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements: Accounting Pronouncements Adopted in 2019 In February 2016, the Financial Accounting Standards Board ("FASB") issued a new lease accounting standard, Leases (Accounting Standards Codification ("ASC") 842), which replaces the prior lease guidance, (ASC 840). 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. Registrant adopted the new lease accounting standard as of January 1, 2019 and did not adjust comparative periods for it. There was no cumulative-effect impact to the opening balance of retained earnings as a result of this adoption. Registrant elected the practical expedient under ASU 2018-01 Land Easement Practical Expedient for Transition to Topic 842 and did not review existing easements entered into prior to January 1, 2019. Leases with terms of twelve months or less were not recorded on the balance sheet. The adoption of the new lease guidance did not have a material impact on Registrant's results of operations or liquidity, but resulted in the recognition of operating lease liabilities and operating lease right-of-use assets on its balance sheets. The adoption of this guidance as of January 1, 2019 resulted in the recognition of $7.6 million in right-of-use assets and $8.0 million in operating lease liabilities (see Note 10). In August 2018, the FASB issued Accounting Standards Update ("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 ASU, entities that enter into cloud computing service arrangements are required to 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. Registrant adopted this guidance effective January 1, 2019. This accounting change did not have a significant impact on Registrant's financial statements. Accounting Pronouncements to be Adopted in Future Periods In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, and issued further guidance in November 2018 and May 2019, related to the impairment of financial instruments, effective January 1, 2020. The new guidance provides an impairment model, known as the current expected credit loss model, which is based on expected credit losses rather than incurred losses over the remaining life of most financial assets measured at amortized cost, including trade and other receivables. Registrant is currently evaluating the impact of this new guidance and do not expect the adoption of the guidance will have a material impact on its financial statements. 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 ASU removes disclosures to pension plans and other post-retirement benefit plans that no longer are considered cost beneficial, clarifies the specific disclosure requirements and adds disclosure requirements deemed relevant. This ASU is effective for fiscal years ending after December 15, 2020 and will be applied by Registrant on a retrospective basis to all periods presented. Registrant is still evaluating the ASU and has not yet determined the effect on the Company's financial statements.

Earnings per Share/Capital Stock: (Tables)

6 Months Ended

Jun. 30, 2019

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 June 30,				For the Six Months Ended June 30,
(in thousands, except per share amounts)	2019		2018		2019		2018
Net income	$	26,784	$	16,348	$	39,636	$	27,130
Less: (a) Distributed earnings to common shareholders	10,119		9,367		20,232		18,729
Distributed earnings to participating securities	46		51		88		96
Undistributed earnings	16,619		6,930		19,316		8,305

(b) Undistributed earnings allocated to common shareholders	16,543		6,894		19,232		8,263
Undistributed earnings allocated to participating securities	76		36		84		42
Total income available to common shareholders, basic (a)+(b)	$	26,662	$	16,261	$	39,464	$	26,992

Weighted average Common Shares outstanding, basic	36,804		36,733		36,788		36,723
Basic earnings per Common Share	$	0.72	$	0.44	$	1.07	$	0.74

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 June 30,				For the Six Months Ended June 30,
(in thousands, except per share amounts)	2019		2018		2019		2018
Common shareholders earnings, basic	$	26,662	$	16,261	$	39,464	$	26,992
Undistributed earnings for dilutive stock-based awards	75		36		84		42
Total common shareholders earnings, diluted	$	26,737	$	16,297	$	39,548	$	27,034

Weighted average common shares outstanding, basic	36,804		36,733		36,788		36,723
Stock-based compensation (1)	159		179		154		173
Weighted average common shares outstanding, diluted	36,963		36,912		36,942		36,896

Diluted earnings per Common Share	$	0.72	$	0.44	$	1.07	$	0.73

Business Segments: (Tables)

6 Months Ended

Jun. 30, 2019

Segment Reporting [Abstract]

Schedule of reporting segments information



	As Of And For The Three Months Ended June 30, 2019
	GSWC							AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS			Parent			AWR
Operating revenues	$	88,140	$	7,408	$	29,099		$	—		$	124,647
Operating income (loss)	33,259		778		5,395			(2		)	39,430
Interest expense, net	5,112		346		(219		)	167			5,406
Utility plant	1,273,962		63,462		18,239			—			1,355,663
Depreciation and amortization expense (1)	5,405		601		649			—			6,655
Income tax expense (benefit)	6,812		14		1,300			(295		)	7,831
Capital additions	36,293		1,254		3,046			—			40,593



	As Of And For The Three Months Ended June 30, 2018
	GSWC							AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS			Parent			AWR
Operating revenues	$	76,733	$	7,841	$	22,327		$	—		$	106,901
Operating income (loss)	21,244		1,401		2,925			(2		)	25,568
Interest expense, net	5,047		353		(71		)	83			5,412
Utility plant	1,166,867		60,504		11,418			—			1,238,789
Depreciation and amortization expense (1)	8,866		564		580			—			10,010
Income tax expense (benefit)	3,909		305		705			(532		)	4,387
Capital additions	24,768		1,150		2,500			—			28,418



	As Of And For The Six Months Ended June 30, 2019
	GSWC							AWR		Consolidated
(dollars in thousands)	Water		Electric		ASUS			Parent		AWR
Operating revenues	$	152,863	$	18,037	$	55,480				$	226,380
Operating income (loss)	46,525		2,839		10,265			(4	)	59,625
Interest expense, net	10,349		699		(580		)	313		10,781
Utility plant	1,273,962		63,462		18,239			—		1,355,663
Depreciation and amortization expense (1)	14,794		1,201		1,492			—		17,487
Income tax expense (benefit)	8,485		461		2,425			(230	)	11,141
Capital additions	74,672		1,988		4,495			—		81,155



	As Of And For The Six Months Ended June 30, 2018
	GSWC							AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS			Parent			AWR
Operating revenues	$	141,145	$	17,673	$	42,811		$	—		$	201,629
Operating income (loss)	35,302		3,640		5,322			(5		)	44,259
Interest expense, net	10,056		723		(137		)	157			10,799
Utility plant	1,166,867		60,504		11,418			—			1,238,789
Depreciation and amortization expense (1)	17,635		1,129		912			—			19,676
Income tax expense (benefit)	5,558		771		1,259			(637		)	6,951
Capital additions	51,386		2,124		5,272			—			58,782

(1) Depreciation computed on GSWC’s transportation equipment is recorded in other operating expenses and totaled $96,000

and $61,000 for the three months ended June 30, 2019 and 2018, respectively, and $154,000 and $121,000 for the six months ended June 30, 2019 and 2018, respectively.

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):



	June 30,
	2019		2018
Total utility plant	$	1,355,663	$	1,238,789
Other assets	211,620		202,333
Total consolidated assets	$	1,567,283	$	1,441,122

Summary of Significant Accounting Policies: (Details) customer in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) customer registrant	Jun. 30, 2018 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Summary of significant accounting policies
Earnings reinvested in the business	$ 323,818,000		$ 323,818,000				$ 0	$ 304,534,000
Operating lease right-of-use assets	11,058,000		$ 11,058,000				7,600,000	0
Basis of Presentation:
Number of registrants filing combined report \| registrant			2
Related Party Transactions
Notes payable to bank	185,500,000		$ 185,500,000					95,500,000
Total lease obligations	11,356,000		11,356,000				$ 8,000,000.0
AWR \| Syndicated Credit Facility
Related Party Transactions
Maximum borrowing capacity on line of credit						$ 200,000,000.0
GOLDEN STATE WATER COMPANY
Summary of significant accounting policies
Earnings reinvested in the business	222,179,000		222,179,000					211,163,000
Operating lease right-of-use assets	10,432,000		10,432,000					$ 0
Related Party Transactions
Payments to affiliate for corporate office administrative and general costs	$ 1,300,000	$ 1,000,000.0	$ 2,400,000	$ 2,000,000.0
GOLDEN STATE WATER COMPANY \| Notes Payable 6.7 Percent Due 2019 [Member]
Related Party Transactions
Debt and Capital Lease Obligations						$ 40,000,000.0
Debt Instrument, Interest Rate, Stated Percentage						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
ASUS \| Contracted Services
Nature of Operations:
Period of fixed price contracts to operate and maintain water systems at various military bases			50 years
Sales \| GOLDEN STATE WATER COMPANY \| Water Service Utility Operations
Nature of Operations:
Concentration Risk, Percentage			90.00%
Sales \| GOLDEN STATE WATER COMPANY \| Electric Service Utility Operations
Nature of Operations:
Concentration Risk, Percentage			85.00%
Minimum [Member] \| AWR \| Syndicated Credit Facility
Related Party Transactions
Line of Credit Facility, Current Borrowing Capacity						$ 150,000,000.0
Subsequent Event [Member] \| GOLDEN STATE WATER COMPANY \| Syndicated Credit Facility
Related Party Transactions
Debt Instrument, Face Amount					$ 115,000,000.0

Revenue from Contract with Customers - Additional Information (Details) $ in Billions	6 Months Ended
	Jun. 30, 2019 USD ($)
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation	$ 3.2
ASUS \| Contracted Services
Disaggregation of Revenue [Line Items]
Period of fixed price contracts to operate and maintain water systems at various military bases	50 years
ASUS \| Minimum
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, explanation	P35Y
ASUS \| Maximum
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, explanation	P49Y
Sales \| GOLDEN STATE WATER COMPANY \| Water Service Utility Operations [Member]
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	90.00%
Sales \| GOLDEN STATE WATER COMPANY \| Electric Service Utility Operations
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	85.00%

Revenue from Contract with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
WRAM under-collection (alternative revenue program)	$ (88,140)	$ (76,733)	$ (152,863)	$ (141,145)
BRRAM over-collection (alternative revenue program)	(7,408)	(7,841)	(18,037)	(17,673)
Total operating revenues	124,647	106,901	226,380	201,629
GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
WRAM under-collection (alternative revenue program)	(88,140)	(76,733)	(152,863)	(141,145)
BRRAM over-collection (alternative revenue program)	(7,408)	(7,841)	(18,037)	(17,673)
Total operating revenues	95,548	84,574	170,900	158,818
Water Service Utility Operations \| GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	78,100	71,432	138,425	138,442
Regulated Operating Revenue	10,040
Total operating revenues	88,140	76,733	152,863	141,145
Electric Service Utility Operations \| GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	7,741	7,858	19,061	17,924
BRRAM over-collection (alternative revenue program)	(333)	(17)	(1,024)	(251)
Total operating revenues	7,408	7,841	18,037	17,673
Contracted Services \| ASUS
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	29,099	22,327	55,480	42,811
Tariff-based Revenues \| Water Service Utility Operations \| GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	76,876	70,251	136,451	136,026
Tariff-based Revenues \| Electric Service Utility Operations \| GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	7,698	7,795	18,964	17,814
Surcharges (Cost-recovery Activities) \| Water Service Utility Operations \| GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	763	728	1,054	1,521
Surcharges (Cost-recovery Activities) \| Electric Service Utility Operations \| GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	43	63	97	110
Other Products and Services \| Water Service Utility Operations \| GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	461	453	920	895
Alternative revenues program [Member] \| Water Service Utility Operations \| GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
WRAM under-collection (alternative revenue program)		(5,301)	(14,438)	(2,703)
Water \| Contracted Services \| ASUS
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	14,620	14,233	27,975	27,233
Wastewater \| Contracted Services \| ASUS
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 14,479	$ 8,094	$ 27,505	$ 15,578
Sales \| Water Service Utility Operations \| GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage			90.00%
Sales \| Electric Service Utility Operations \| GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage			85.00%

Revenue from Contract with Customers - Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jan. 01, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with Customer, Liability, Revenue Recognized	$ 1,700	$ 1,300
ASUS
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Receivable from the U.S. government	59,859	59,859	$ 61,126
Contract assets	31,557	31,557	24,447
Contract liabilities	$ 11,564	$ 11,564	$ 7,530

Regulatory Matters: (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Regulatory Matters: (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jul. 01, 2019	May 30, 2019	Dec. 31, 2018
Regulatory matters:
Regulatory asset not accruing carrying costs	$ (55,700)		$ (55,700)
Pension and other post-retirement obligations
Regulatory matters:
Regulatory asset not accruing carrying costs	(35,300)		(35,300)
GOLDEN STATE WATER COMPANY
Regulatory matters:
Regulatory assets	13,284		13,284				$ 28,340
GOLDEN STATE WATER COMPANY \| Tax Cuts and Jobs Act memorandum accounts
Regulatory matters:
Regulatory assets	8,987		8,987				8,293
GOLDEN STATE WATER COMPANY \| Various refunds to customers
Regulatory matters:
Regulatory assets	9,358		9,358				7,517
GOLDEN STATE WATER COMPANY \| Authorized Capital Infrastructure [Member]
Regulatory matters:
Regulatory assets						$ (334,500)
GOLDEN STATE WATER COMPANY \| Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
Regulatory matters:
Amount billed to customers as surcharges	832	$ 5,600	3,600	$ 9,800
Regulatory assets	(30,522)		(30,522)				(17,763)
GOLDEN STATE WATER COMPANY \| Costs deferred for future recovery on Aerojet case
Regulatory matters:
Regulatory assets	(9,166)		(9,166)				(9,516)
GOLDEN STATE WATER COMPANY \| Pension and other post-retirement obligations
Regulatory matters:
Regulatory assets	(32,444)		(32,444)				(33,124)
GOLDEN STATE WATER COMPANY \| Derivative [Member]
Regulatory matters:
Regulatory asset not accruing carrying costs	(267)		(267)
GOLDEN STATE WATER COMPANY \| Derivative unrealized loss
Regulatory matters:
Regulatory assets	(267)		(267)				(311)
GOLDEN STATE WATER COMPANY \| Low income rate assistance balancing accounts
Regulatory matters:
Regulatory assets	(1,787)		(1,787)				(2,784)
GOLDEN STATE WATER COMPANY \| General Rate Case Memorandum Accounts
Regulatory matters:
Regulatory assets	(8,025)		(8,025)				(5,054)
GOLDEN STATE WATER COMPANY \| Deferred Income Tax Charge
Regulatory matters:
Regulatory asset not accruing carrying costs	(80,700)		(80,700)
Regulatory assets	80,690		80,690				81,465
GOLDEN STATE WATER COMPANY \| Flow-through taxes, net
Regulatory matters:
Regulatory asset not accruing carrying costs	(14,200)		(14,200)
Regulatory assets	14,160		14,160				15,273
GOLDEN STATE WATER COMPANY \| Other Regulatory Assets Net [Member]
Regulatory matters:
Regulatory assets	(17,700)		(17,700)				$ (15,656)
GOLDEN STATE WATER COMPANY \| Deferred Project Costs [Member]
Regulatory matters:
Regulatory assets						$ (20,400)
GOLDEN STATE WATER COMPANY \| Other Regulatory Assets (Liabilities) [Member]
Regulatory matters:
Regulatory assets	(1,100)		(1,100)
GOLDEN STATE WATER COMPANY \| Water Revenue Adjustment Mechanism [Member]
Regulatory matters:
Regulatory assets	(19,700)		(19,700)
Water general rate case [Member] \| General Rate Case Memorandum Accounts
Regulatory matters:
Regulatory assets	$ (5,600)		$ (5,600)
Subsequent Event [Member] \| Water Service Utility Operations [Member] \| Tax Cuts and Jobs Act memorandum accounts
Regulatory matters:
Regulatory assets					$ 7,200
Maximum [Member] \| GOLDEN STATE WATER COMPANY \| Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
Regulatory matters:
Regulatory Asset Recovery Periods			24 months
Maximum [Member] \| GOLDEN STATE WATER COMPANY \| General Rate Case Memorandum Accounts
Regulatory matters:
Regulatory Asset Recovery Periods			24 months
Minimum [Member] \| GOLDEN STATE WATER COMPANY \| Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
Regulatory matters:
Regulatory Asset Recovery Periods			12 months
Minimum [Member] \| GOLDEN STATE WATER COMPANY \| General Rate Case Memorandum Accounts
Regulatory matters:
Regulatory Asset Recovery Periods			12 months

Regulatory Matters: Alternative-Revenue Programs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jul. 01, 2019	May 30, 2019	Dec. 31, 2018
Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
Regulatory matters:
Increase (decrease) in other regulatory assets			$ 16,400
GOLDEN STATE WATER COMPANY
Regulatory matters:
Regulatory assets	$ (13,284)		$ (13,284)				$ (28,340)
GOLDEN STATE WATER COMPANY \| Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
Regulatory matters:
Commercial paper, term			90 days
Amount billed to customers as surcharges	832	$ 5,600	$ 3,600	$ 9,800
Regulatory assets	30,522		$ 30,522				$ 17,763
GOLDEN STATE WATER COMPANY \| Water Revenue Adjustment Mechanism and Modified Cost Balancing Account \| Minimum
Regulatory matters:
Regulatory Asset Recovery Periods			12 months
GOLDEN STATE WATER COMPANY \| Water Revenue Adjustment Mechanism and Modified Cost Balancing Account \| Maximum
Regulatory matters:
Regulatory Asset Recovery Periods			24 months
GOLDEN STATE WATER COMPANY \| WRAM
Regulatory matters:
Regulatory assets						$ 20,400
GOLDEN STATE WATER COMPANY \| Modified Cost Balancing Account
Regulatory matters:
Regulatory assets	$ 10,800		$ 10,800
Subsequent Event [Member] \| Water Service Utility Operations [Member] \| Revenue Subject to Refund for TCJA [Member]
Regulatory matters:
Regulatory assets					$ (7,200)

Earnings per Share/Capital Stock: (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Anti-dilutive stock options not included in the computation of diluted EPS (in shares)	0				0	0
Payments Related to Tax Withholding for Share-based Compensation					$ 1,573	$ 1,214
Basic
Net income	$ 26,784	$ 12,852	$ 16,348	$ 10,782	$ 39,636	$ 27,130
Dividends Declared Per Common Share (in dollars per share)	$ 0.275		$ 0.255		$ 0.550	$ 0.510
Weighted Average Dividends Common Stock	$ 10,119		$ 9,367		$ 20,232	$ 18,729
Less: Distributed earnings to participating securities	46		51		88	96
Undistributed earnings	16,619		6,930		19,316	8,305
Undistributed earnings allocated to common shareholders	16,543		6,894		19,232	8,263
Undistributed earnings allocated to participating securities	76		36		84	42
Total income available to common shareholders, basic	$ 26,662		$ 16,261		$ 39,464	$ 26,992
Weighted average Common Shares outstanding, basic (in shares)	36,804,000		36,733,000		36,788,000	36,723,000
Basic earnings per Common Share (in dollars per share)	$ 0.72		$ 0.44		$ 1.07	$ 0.74
Diluted
Total income available to common shareholders, basic	$ 26,662		$ 16,261		$ 39,464	$ 26,992
Undistributed earnings for dilutive stock-based awards	75		36		84	42
Total common shareholders earnings, diluted	$ 26,737		$ 16,297		$ 39,548	$ 27,034
Weighted average Common Shares outstanding, basic (in shares)	36,804,000		36,733,000		36,788,000	36,723,000
Stock-based compensation (in shares)	159,000		179,000		154,000	173,000
Weighted average common shares outstanding, diluted (in shares)	36,963,000		36,912,000		36,942,000	36,896,000
Diluted earnings per Common Share (in dollars per share)	$ 0.72		$ 0.44		$ 1.07	$ 0.73

Earnings per Share/Capital Stock: (Details 2) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Capital stock
Net income	$ 26,784	$ 12,852	$ 16,348	$ 10,782	$ 39,636	$ 27,130
Total income available to common shareholders, basic	$ 26,662		$ 16,261		$ 39,464	$ 26,992
Additional disclosure
Options outstanding (in shares)	11,556		47,792		11,556	47,792
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					73,854	52,712
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans			$ 340		$ 366
Payments Related to Tax Withholding for Share-based Compensation					(1,573)	$ (1,214)
Weighted Average Dividends Common Stock	$ 10,119		$ 9,367		20,232	18,729
Dividends paid					$ 20,232	$ 18,729
Dividends Declared Per Common Share (in dollars per share)	$ 0.275		$ 0.255		$ 0.550	$ 0.510
Preferred Stock Dividends and Other Adjustments	$ 46		$ 51		$ 88	$ 96
Undistributed Earnings, Basic	16,619		6,930		19,316	8,305
Undistributed earnings allocated to common shareholders	16,543		6,894		19,232	8,263
Undistributed earnings allocated to participating securities	$ 76		$ 36		$ 84	$ 42
Weighted average Common Shares outstanding, basic (in shares)	36,804,000		36,733,000		36,788,000	36,723,000
Basic earnings per Common Share (in dollars per share)	$ 0.72		$ 0.44		$ 1.07	$ 0.74
Restricted Stock Units
Additional disclosure
Restricted stock units outstanding (in shares)	170,372		204,909		170,372	204,909
Golden State Water Company [Member]
Capital stock
Net income	$ 22,298	9,022	$ 13,648	8,890	$ 31,320	$ 22,538
Additional disclosure
Payments Related to Tax Withholding for Share-based Compensation					(1,310)	(1,053)
Dividends paid		$ 10,100		$ 9,400	$ 20,200	$ 18,750

Derivative Instruments (Details) - GOLDEN STATE WATER COMPANY $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) MWh	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Description of derivative activity volume \| MWh				44,064
Commodity Contract
Derivative Instruments, Gain (Loss) [Line Items]
Term of derivative contract						3 years
Number of broker quotes received to determine fair value of derivative instrument		1		1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of the period		$ (336)	$ (2,625)	$ (311)	$ (2,941)
Unrealized gain on purchased power contracts		69	915	44	1,231
Fair value at end of the period		$ (267)	$ (1,710)	$ (267)	$ (1,710)	$ (2,941)
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
Subsequent Event [Member] \| Commodity Contract
Derivative Instruments, Gain (Loss) [Line Items]
Term of derivative contract	5 years

Fair Value of Financial Instruments: (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
GOLDEN STATE WATER COMPANY \| Reported Value Measurement
Fair value of financial instruments
Long-term Debt, Fair Value	$ 284,778		$ 324,978
GOLDEN STATE WATER COMPANY \| Estimate of Fair Value Measurement
Fair value of financial instruments
Long-term Debt, Fair Value	372,745		$ 387,889
Mutual Funds \| Fair Value, Inputs, Level 1
Financial liabilities:
Long-term debt-GSWC	$ 18,500
Notes Payable 6.7 Percent Due 2019 [Member] \| GOLDEN STATE WATER COMPANY
Fair value of financial instruments
Debt and Capital Lease Obligations		$ 40,000
Financial liabilities:
Debt Instrument, Interest Rate, Stated Percentage		6.70%

Employee Benefit Plans: (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Employee Benefit Plans: (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Components of Net Periodic Benefits Cost:
Increase (Decrease) in Regulatory Assets and Liabilities			$ (13,932)	$ 12,240
GOLDEN STATE WATER COMPANY
Components of Net Periodic Benefits Cost:
Increase (Decrease) in Regulatory Assets and Liabilities			(13,932)	12,240
Pension Benefits
Components of Net Periodic Benefits Cost:
Service cost	$ 986	$ 1,269	2,220	2,670
Interest cost	2,133	1,903	4,264	3,824
Expected return on plan assets	(2,595)	(2,795)	(5,188)	(5,586)
Amortization of prior service cost	109	0	218	0
Amortization of actuarial (gain) loss	351	283	710	628
Net periodic benefits costs under accounting standards	984	660	2,224	1,536
Increase (Decrease) in Regulatory Assets and Liabilities	(342)	0	(342)	0
Expected contributions in current fiscal year	3,900		3,900
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool	642	660	1,882	1,536
Pension Benefits \| GOLDEN STATE WATER COMPANY
Components of Net Periodic Benefits Cost:
Regulatory adjustment — deferred			(2,900)
Other Postretirement Benefits
Components of Net Periodic Benefits Cost:
Service cost	53	57	106	114
Interest cost	80	72	160	144
Expected return on plan assets	(112)	(123)	(224)	(246)
Amortization of prior service cost	0	0	0	0
Amortization of actuarial (gain) loss	(150)	(182)	(300)	(364)
Net periodic benefits costs under accounting standards	(129)	(176)	(258)	(352)
Increase (Decrease) in Regulatory Assets and Liabilities	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool	(129)	(176)	(258)	(352)
SERP
Components of Net Periodic Benefits Cost:
Service cost	298	274	596	548
Interest cost	267	222	534	444
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Amortization of actuarial (gain) loss	118	262	236	524
Net periodic benefits costs under accounting standards	683	758	1,366	1,516
Increase (Decrease) in Regulatory Assets and Liabilities	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool	$ 683	$ 758	$ 1,366	$ 1,516

Contingencies (Details) $ in Millions	6 Months Ended
Contingencies (Details) $ in Millions	Jun. 30, 2019 USD ($)
Loss Contingencies [Line Items]
Amount spent in clean-up and remediation activities [Abstract]	$ 1.5
Environmental Clean-Up and Remediation \| GOLDEN STATE WATER COMPANY
Loss Contingencies [Line Items]
Environmental Remediation Expense	6.2
Accrued liability for the estimated additional cost to complete the clean-up at the site	$ 1.3

Leases Lease -additional information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right-of-use assets	$ 11,058		$ 11,058		$ 7,600	$ 0
Operating lease liabilities	1,808		1,808			0
Operating lease liabilities	9,548		9,548			0
Short-term Lease Payments			2,200
Debt Instrument [Line Items]
Operating Lease, Expense	630	$ 567	1,300	$ 1,100
Notes Payable 9.56 Percent Due 2031 [Member]
Debt Instrument [Line Items]
Notes Payable to Bank	$ 28,000		$ 28,000
Debt Instrument, Interest Rate, Stated Percentage	9.56%		9.56%
Golden State Water Company [Member]
Leases [Abstract]
Operating lease right-of-use assets	$ 10,432		$ 10,432			0
Operating lease liabilities	1,484		1,484			0
Operating lease liabilities	$ 9,283		$ 9,283			$ 0
Debt Instrument [Line Items]
Ratio of Indebtedness to Net Capital	0.46		0.46
Golden State Water Company [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Ratio of Indebtedness to Net Capital	0.6667		0.6667

Leases Supplemental Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Debt Instrument [Line Items]
Operating Lease, Expense	$ 630	$ 567	$ 1,300	$ 1,100
Operating lease costs	761		1,559
Short-term lease costs	$ 106		$ 180
Weighted average remaining lease term (in years)	7 years 9 months 21 days		7 years 9 months 21 days
Weighted-average discount rate	3.40%		3.40%
Lease liabilities arising from obtaining right-of-use assets	$ 6,730		$ 14,698
Notes Payable 9.56 Percent Due 2031 [Member]
Debt Instrument [Line Items]
Notes Payable to Bank	$ 28,000		$ 28,000

Leases Lessee Operating Lease Liability Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
2019 (July through December 2019 as of June 30, 2019)	$ 1,370
2020	2,293
2021	2,122
2022	1,795
2023	1,337
Thereafter	4,615
Total lease payments	13,532
Less: imputed interest	2,176
Total lease obligations	11,356	$ 8,000
Less: current obligations	1,808		$ 0
Long-term lease obligations	$ 9,548		0
2019 (July through December 2019 as of June 30, 2019)			2,818
2020			2,530
2021			1,497
2022			1,007
2023			546
Thereafter			605
Total lease payments			$ 9,003

Business Segments: (Details) $ in Thousands	3 Months Ended		6 Months Ended
Business Segments: (Details) $ in Thousands	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Details of reportable segment
Total operating revenues	$ 124,647	$ 106,901	$ 226,380	$ 201,629
Operating income (loss)	39,430	25,568	59,625	44,259
Interest expense, net	5,406	5,412	10,781	10,799
Utility plant	1,355,663	1,238,789	1,355,663	1,238,789	$ 1,296,310
Depreciation and amortization expense	6,655	10,010	17,487	19,676
Income tax expense (benefit)	7,831	4,387	11,141	6,951
Capital additions	40,593	28,418	$ 81,155	58,782
AWR
Details of reportable segment
Number of reportable segments \| segment			3
GOLDEN STATE WATER COMPANY
Details of reportable segment
Public Utilities Property Plant and Equipment Depreciation on Transportation Equipment	96	61	$ 154	121
Number of reportable segments \| segment			2
Total operating revenues	95,548	84,574	$ 170,900	158,818
Operating income (loss)	34,037	22,645	49,364	38,942
Utility plant	1,337,424		1,337,424		$ 1,281,092
Depreciation and amortization expense	6,006	9,430	15,995	18,764
Income tax expense (benefit)	6,826	4,214	8,946	6,329
GOLDEN STATE WATER COMPANY \| Water Service Utility Operations
Details of reportable segment
Total operating revenues	88,140	76,733	152,863	141,145
GOLDEN STATE WATER COMPANY \| Electric Service Utility Operations
Details of reportable segment
Total operating revenues	7,408	7,841	$ 18,037	17,673
ASUS \| Contracted Services
Details of reportable segment
Period of fixed price contracts to operate and maintain water systems at various military bases			50 years
Reportable Legal Entities \| GOLDEN STATE WATER COMPANY \| Water Service Utility Operations
Details of reportable segment
Total operating revenues	88,140	76,733	$ 152,863	141,145
Operating income (loss)	33,259	21,244	46,525	35,302
Interest expense, net	5,112	5,047	10,349	10,056
Utility plant	1,273,962	1,166,867	1,273,962	1,166,867
Depreciation and amortization expense	5,405	8,866	14,794	17,635
Income tax expense (benefit)	6,812	3,909	8,485	5,558
Capital additions	36,293	24,768	74,672	51,386
Reportable Legal Entities \| GOLDEN STATE WATER COMPANY \| Electric Service Utility Operations
Details of reportable segment
Total operating revenues	7,408	7,841	18,037	17,673
Operating income (loss)	778	1,401	2,839	3,640
Interest expense, net	346	353	699	723
Utility plant	63,462	60,504	63,462	60,504
Depreciation and amortization expense	601	564	1,201	1,129
Income tax expense (benefit)	14	305	461	771
Capital additions	1,254	1,150	1,988	2,124
Reportable Legal Entities \| ASUS \| Contracted Services
Details of reportable segment
Total operating revenues	29,099	22,327	55,480	42,811
Operating income (loss)	5,395	2,925	10,265	5,322
Interest expense, net	(219)	71	(580)	137
Utility plant	18,239	11,418	18,239	11,418
Depreciation and amortization expense	649	580	1,492	912
Income tax expense (benefit)	1,300	705	2,425	1,259
Capital additions	3,046	2,500	4,495	5,272
Intersegment Eliminations \| AWR
Details of reportable segment
Total operating revenues	0	0		0
Operating income (loss)	(2)	(2)	(4)	(5)
Interest expense, net	167	(83)	313	(157)
Utility plant	0	0	0	0
Depreciation and amortization expense	0	0	0	0
Income tax expense (benefit)	(295)	(532)	(230)	(637)
Capital additions	$ 0	$ 0	$ 0	$ 0

Business Segments: (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Business Segments: (Details 2) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Details of reportable segment
Total utility plant	$ 1,355,663	$ 1,238,789	$ 1,355,663	$ 1,238,789	$ 1,296,310
Other assets	211,620	202,333	211,620	202,333
Total Assets	1,567,283	1,441,122	1,567,283	1,441,122	1,501,433
GOLDEN STATE WATER COMPANY
Details of reportable segment
Depreciation on transportation equipment	96	$ 61	154	$ 121
Total utility plant	1,337,424		1,337,424		1,281,092
Total Assets	$ 1,446,599		$ 1,446,599		$ 1,389,222

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2019
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 income tax rate (“ETR”) was 22.6% and 21.2% for the three months ended June 30, 2019 and 2018, respectively, and was 21.9% and 20.4% for the six months ended June 30, 2019 and 2018, respectively. GSWC's ETR was 23.4% and 23.6% for the three months ended June 30, 2019 and 2018, respectively, and was 22.2% and 21.9% for the six months ended June 30, 2019 and 2018, respectively. AWR’s ETR increased because of higher state unitary taxes at AWR (parent). The AWR and GSWC effective tax rates differ from the federal statutory tax rate primarily due to (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 months ended June 30, 2019 and 2018, (iii) the continuing amortization of the excess deferred income tax liability that commenced upon the lowering of the federal tax rate, and (iv) 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). As a regulated utility, GSWC treats certain temporary differences as flow-through in computing its income tax expense consistent with the income tax method used in its CPUC-jurisdiction ratemaking. Flow-through items either increase or decrease tax expense and thus impact the ETR.

Income Taxes: (Details)	3 Months Ended		6 Months Ended
Income Taxes: (Details)	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
GOLDEN STATE WATER COMPANY
Effective income tax rate
ETRs (as a percent)	23.40%	23.60%	22.20%	21.90%
Parent [Member]
Effective income tax rate
ETRs (as a percent)	22.60%	21.20%	21.90%	20.40%

Regulatory Matters: CPUC Rehearing Matter and Procurement Audits (Details) - GOLDEN STATE WATER COMPANY - USD ($) $ in Thousands	Jun. 30, 2019	May 30, 2019	Dec. 31, 2018
Regulatory matters:
Capital expenditure approved	$ (13,284)		$ (28,340)
Various refunds to customers
Regulatory matters:
Capital expenditure approved	$ (9,358)		$ (7,517)
Authorized Capital Infrastructure [Member]
Regulatory matters:
Capital expenditure approved		$ 334,500
Deferred Project Costs [Member]
Regulatory matters:
Capital expenditure approved		$ 20,400