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Regulatory Matters: (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Regulatory matters:    
Regulatory asset not accruing carrying costs $ (28,200)  
Regulatory assets (19,867) $ (16,539)
Pension and other post-retirement obligations    
Regulatory matters:    
Regulatory asset not accruing carrying costs (63,200)  
Deferred Income Tax Charge    
Regulatory matters:    
Regulatory asset not accruing carrying costs (77,400)  
Flow-through taxes, net    
Regulatory matters:    
Regulatory asset not accruing carrying costs (7,200)  
Derivative unrealized (gain) loss    
Regulatory matters:    
Regulatory asset not accruing carrying costs (7,900)  
Bear Valley Electric Service, Inc.    
Regulatory matters:    
Regulatory asset-Wildfire mitigation Plans (WMP) 2,200  
Regulatory asset CEMA - Storm 455  
Bear Valley Electric Service, Inc. | Other Regulatory Assets Net [Member]    
Regulatory matters:    
Regulatory assets (4,101) (2,629)
Bear Valley Electric Service, Inc. | Derivative unrealized (gain) loss    
Regulatory matters:    
Regulatory assets 7,875 (1,537)
Golden State Water Company    
Regulatory matters:    
Regulatory assets (23,641) (12,373)
Golden State Water Company | Revenue Subject to Refund [Member]    
Regulatory matters:    
Regulatory assets 3,929 4,577
Golden State Water Company | Costs deferred for future recovery on Aerojet case    
Regulatory matters:    
Regulatory assets (5,557) (6,751)
Golden State Water Company | Pension and other post-retirement obligations    
Regulatory matters:    
Regulatory assets (63,149) (65,576)
Golden State Water Company | Catastrophic Event Memo Account (CEMA) [Member]    
Regulatory matters:    
Regulatory assets (7,912) (4,119)
Golden State Water Company | Deferred Income Tax Charge    
Regulatory matters:    
Regulatory assets 73,409 74,185
Golden State Water Company | Flow-through taxes, net    
Regulatory matters:    
Regulatory assets 6,620 9,722
Golden State Water Company | Other Regulatory Assets Net [Member]    
Regulatory matters:    
Regulatory assets (11,372) (10,670)
Golden State Water Company | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account    
Regulatory matters:    
Regulatory assets (19,609) $ (13,741)
Golden State Water Company | Water Revenue Adjustment Mechanism [Member]    
Regulatory matters:    
Regulatory assets (3,400)  
Golden State Water Company and Bear Valley Electric Service Inc.    
Regulatory matters:    
Regulatory asset-CEMA $ 8,500