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Completion of Electric Utility Reorganization Plan (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Jul. 01, 2020
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Oct. 30, 2020
Completion of Electric Utility Reorganization Plan[Line Items]                      
Gain (loss) on asset transfer $ 0                    
Electric   $ 8,564     $ 8,288       $ 28,211 $ 26,935  
Net income   28,153 $ 26,576 $ 19,268 26,530 $ 25,612 $ 14,072   73,997 66,214  
Net cash provided from operating activities                 81,923 87,843  
Net cash used in investing activities                 (106,492) (94,637)  
Net cash provided from financing activities (1)                 (5,027) 13,587  
Incremental expansion of borrowing capacity                     $ 30,000
Bear Valley Electric Service, Inc.                      
Completion of Electric Utility Reorganization Plan[Line Items]                      
Net assets transferred 71,300                    
Bear Valley Electric Service, Inc.                      
Completion of Electric Utility Reorganization Plan[Line Items]                      
Taxes Payable $ 0                    
Debt instrument term 3 years                    
Maximum borrowing capacity on line of credit $ 35,000                    
Outstanding borrowings   28,000             28,000    
Incremental expansion of borrowing capacity   15,000             15,000    
Bear Valley Electric Service, Inc. | Electric Service Utility Operations                      
Completion of Electric Utility Reorganization Plan[Line Items]                      
Electric         8,288       28,211 26,935  
Operating expenses         6,423       20,915 20,070  
Operating income         1,865       7,296 6,865  
Net income         1,308       5,310 4,717  
Net cash provided from operating activities         603       7,215    
Net cash used in investing activities         (3,039)       (15,139)    
Net cash provided from financing activities (1)         2,999       7,824    
Net change in cash and cash equivalents         563       (100)    
Cash and cash equivalents, beginning of period $ 20     367 20       367    
Cash and cash equivalents, end of period   267     583 20   $ 20 267 583  
Golden State Water Company                      
Completion of Electric Utility Reorganization Plan[Line Items]                      
Electric   0     0       0 18,647  
Net income   $ 22,797 $ 20,960 $ 12,231 $ 21,143 $ 20,919 $ 11,202   55,988 53,264  
Net cash provided from operating activities                 73,327 75,093  
Net cash used in investing activities                 (90,118) (87,529)  
Net cash provided from financing activities (1)                 $ (15,828) $ 16,108  
Golden State Water Company | Electric Service Utility Operations                      
Completion of Electric Utility Reorganization Plan[Line Items]                      
Electric               18,647      
Operating expenses               13,647      
Operating income               5,000      
Net income               $ 3,409