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

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