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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]            
Operating revenues       $ 498,853 $ 488,243 $ 473,869
Net Income       94,347 86,425 84,342
Net cash provided from operating activities       115,584 122,170 116,864
Net cash used in investing activities (capital expenditures)       (145,092) (131,610) (153,195)
Net cash provided from financing activities       (2,266) 44,843 30,524
Cash and cash equivalents, beginning of the year     $ 1,334 36,737 1,334 7,141
Cash and cash equivalents, end of year   $ 36,737   4,963 36,737 1,334
Bear Valley Electric Service, Inc.            
Restructuring Cost and Reserve [Line Items]            
Net assets transferred $ 71,300          
Bear Valley Electric Service, Inc.            
Restructuring Cost and Reserve [Line Items]            
Maximum borrowing capacity       35,000    
Notes Payable       31,000    
Incremental expansion of borrowing capacity 35,000     15,000    
Bear Valley Electric Service, Inc. | Electric            
Restructuring Cost and Reserve [Line Items]            
Operating revenues   18,377   38,345    
Operating expenses   13,074   27,607    
Operating income   5,303   10,738    
Net Income   3,870   7,864    
Net cash provided from operating activities   1,887   9,128    
Net cash used in investing activities (capital expenditures)   (9,339)   (19,859)    
Net cash provided from financing activities   7,799   10,827    
Cash and Cash Equivalents, Period Increase (Decrease), Total   347   96    
Cash and cash equivalents, beginning of the year       367    
Cash and cash equivalents, end of year $ 20 367   463 367  
GSWC            
Restructuring Cost and Reserve [Line Items]            
Operating revenues       347,112 349,284 359,378
Net Income       69,215 64,971 66,663
Net cash provided from operating activities       100,294 110,337 96,628
Net cash used in investing activities (capital expenditures)       (124,259) (117,684) (144,188)
Net cash provided from financing activities       (11,088) 42,524 43,774
Cash and cash equivalents, beginning of the year     401 35,578 401 4,187
Cash and cash equivalents, end of year   $ 35,578   $ 525 35,578 401
GSWC | Electric            
Restructuring Cost and Reserve [Line Items]            
Operating revenues     18,647   37,024 $ 39,548
Operating expenses     13,647      
Operating income     5,000      
Net Income     $ 3,408      
Golden State Water Company and Bear Valley Electric Service, Inc. [Member] | Electric            
Restructuring Cost and Reserve [Line Items]            
Operating revenues         37,024  
Operating expenses         26,721  
Operating income         10,303  
Net Income         $ 7,278