Completion of Electric Utility Reorganization Plan (Details) - USD ($) $ in Thousands		6 Months Ended		12 Months Ended
	Jul. 01, 2020	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Operating revenues				$ 491,528	$ 498,853	$ 488,243
Net Income				78,396	94,347	86,425
Net cash provided from operating activities				117,799	115,584	122,170
Net cash used in investing activities (capital expenditures)				(167,102)	(145,092)	(131,610)
Net cash provided from financing activities				50,337	(2,266)	44,843
Cash and cash equivalents, beginning of the year			$ 1,334	4,963	36,737	1,334
Cash and cash equivalents, end of year		$ 36,737		5,997	4,963	36,737
Change in cash and equivalents				1,034	(31,774)	35,403
BVESI
Restructuring Cost and Reserve [Line Items]
Net assets transferred	$ 71,300
BVESI
Restructuring Cost and Reserve [Line Items]
Maximum borrowing capacity				35,000
Notes Payable				22,000
Incremental expansion of borrowing capacity				15,000
BVESI | Electric
Restructuring Cost and Reserve [Line Items]
Operating revenues		18,377		39,986	38,345
Operating expenses		13,074		28,246	27,607
Operating income		5,303		11,740	10,738
Net Income		3,870		8,876	7,864
Net cash provided from operating activities		1,887		6,627	9,128
Net cash used in investing activities (capital expenditures)		(9,339)		(17,989)	(19,859)
Net cash provided from financing activities		7,799		11,082	10,827
Cash and cash equivalents, beginning of the year				463	367
Cash and cash equivalents, end of year	$ 20	367		183	463	367
Change in cash and equivalents		347		(280)	96
GSWC
Restructuring Cost and Reserve [Line Items]
Operating revenues				340,602	347,112	349,284
Net Income				53,770	69,215	64,971
Net cash provided from operating activities				94,508	100,294	110,337
Net cash used in investing activities (capital expenditures)				(147,731)	(124,259)	(117,684)
Net cash provided from financing activities				53,068	(11,088)	42,524
Cash and cash equivalents, beginning of the year			401	525	35,578	401
Cash and cash equivalents, end of year		$ 35,578		370	525	35,578
Maximum borrowing capacity				130,000
Change in cash and equivalents				$ (155)	(35,053)	35,177
GSWC | Electric
Restructuring Cost and Reserve [Line Items]
Operating revenues			18,647		38,345	37,024
Operating expenses			13,647
Operating income			5,000
Net Income			$ 3,408
Golden State Water Company and Bear Valley Electric Service, Inc. | Electric
Restructuring Cost and Reserve [Line Items]
Operating revenues					37,024	$ 37,024
Operating expenses					26,721
Operating income					10,303
Net Income					$ 7,278