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Business Segments: (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Details of reportable segment
Revenues	$ 136,755	$ 133,688	$ 382,229	$ 364,043
Operating income (loss)	42,784	39,807	110,960	101,222
Interest expense, net	(5,220)	(5,845)	(16,707)	(16,169)
Net property, plant and equipment	1,594,546	1,479,110	1,594,546	1,479,110	$ 1,512,043
Depreciation and amortization	9,826	9,348	29,156	27,190
Income tax expense	9,878	9,045	23,254	21,227
Capital additions	30,574	32,237	$ 106,721	94,824
AWR
Details of reportable segment
Number of reportable segments | segment			3
GOLDEN STATE WATER COMPANY
Details of reportable segment
Number of reportable segments | segment			2
Revenues	102,768	98,701	$ 269,430	275,846
Operating income (loss)	35,459	33,149	87,295	85,416
Net property, plant and equipment	1,471,740		1,471,740		$ 1,400,489
Depreciation and amortization	8,272	7,835	24,547	24,073
Income tax expense	7,993	7,683	17,718	18,220
GOLDEN STATE WATER COMPANY | Water Service Utility Operations
Details of reportable segment
Revenues	102,768	98,701	$ 269,430	257,199
ASUS | Contracted Services
Details of reportable segment
Period of fixed price contracts to operate and maintain water systems at various military bases			50 years
Bear Valley Electric Service, Inc. | Electric Service Utility Operations
Details of reportable segment
Revenues	8,564	8,288	$ 28,211
Golden State Water Company and Bear Valley Electric Service Inc.
Details of reportable segment
Public Utilities Property Plant and Equipment Depreciation on Transportation Equipment	94	84	283	249
Golden State Water Company and Bear Valley Electric Service Inc. | Electric Service Utility Operations
Details of reportable segment
Revenues				26,935
Reportable Legal Entities | GOLDEN STATE WATER COMPANY | Water Service Utility Operations
Details of reportable segment
Revenues	102,768	98,701	269,430	257,199
Operating income (loss)	35,459	33,149	87,295	80,416
Interest expense, net	(5,098)	(5,806)	(16,273)	(15,796)
Net property, plant and equipment	1,471,740	1,373,323	1,471,740	1,373,323
Depreciation and amortization	8,272	7,835	24,547	22,858
Income tax expense	7,993	7,683	17,718	17,031
Capital additions	26,490	28,076	90,299	78,611
Reportable Legal Entities | ASUS | Contracted Services
Details of reportable segment
Revenues	25,423	26,699	84,588	79,909
Operating income (loss)	5,273	4,794	16,375	13,946
Interest expense, net	141	(74)	458	371
Net property, plant and equipment	20,854	22,599	20,854	22,599
Depreciation and amortization	910	887	2,684	2,491
Income tax expense	1,265	1,150	3,927	3,199
Capital additions	143	1,122	1,283	4,120
Reportable Legal Entities | Bear Valley Electric Service, Inc. | Electric Service Utility Operations
Details of reportable segment
Revenues	8,564	8,288	28,211
Operating income (loss)	2,053	1,865	7,296
Interest expense, net	(101)	(54)	(275)
Net property, plant and equipment	101,952	83,188	101,952	83,188
Depreciation and amortization	644	626	1,925
Income tax expense	537	533	1,879
Capital additions	3,941	3,039	15,139
Reportable Legal Entities | Golden State Water Company and Bear Valley Electric Service Inc. | Electric Service Utility Operations
Details of reportable segment
Revenues				26,935
Operating income (loss)				6,865
Interest expense, net				(519)
Depreciation and amortization				1,841
Income tax expense				1,722
Capital additions				12,093
Intersegment Eliminations | AWR
Details of reportable segment
Revenues	0	0	0	0
Operating income (loss)	(1)	(1)	(6)	(5)
Interest expense, net	162	59	617	225
Net property, plant and equipment	0	0	0	0
Depreciation and amortization	0	0	0	0
Income tax expense	83	(321)	(270)	(725)
Capital additions	$ 0	$ 0	$ 0	$ 0

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