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Employee Benefit Plans: (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Components of Net Periodic Benefits Cost:      
Increase (Decrease) in Regulatory Assets and Liabilities $ (3,493) $ (2,976)  
GOLDEN STATE WATER COMPANY      
Components of Net Periodic Benefits Cost:      
Increase (Decrease) in Regulatory Assets and Liabilities (3,165) (2,976)  
Pension Benefits      
Components of Net Periodic Benefits Cost:      
Service cost 1,625 1,408  
Interest cost 1,712 1,954  
Expected return on plan assets (3,134) (2,950)  
Amortization of prior service cost 109 109  
Amortization of actuarial (gain) loss 993 442  
Net periodic benefits costs under accounting standards 1,305 963  
Increase (Decrease) in Regulatory Assets and Liabilities (351) (93)  
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool 954 870  
Expected contributions in current fiscal year $ 3,600    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate     2.55%
'Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate, Increase (Decrease) 0.65%    
Defined Benefit Plan, Benefit Obligation     $ 272,800
Pension Benefits | Pro Forma      
Components of Net Periodic Benefits Cost:      
Sensitivity Analysis For Defined Benefit Plan, Benefit Obligation, Impact Of 65 Basis Point Increase In Discount Rate, Percent     (10.00%)
Sensitivity Analysis For Defined Benefit Plan, Benefit Obligation, Impact Of 65 Basis Point Increase In Discount Rate, Amount     $ (27,300)
Pension Benefits | GOLDEN STATE WATER COMPANY      
Components of Net Periodic Benefits Cost:      
Regulatory adjustment — deferred $ (665)    
Pension Benefits | Bear Valley Electric Service, Inc.      
Components of Net Periodic Benefits Cost:      
Regulatory adjustment — deferred (256)    
Other Postretirement Benefits      
Components of Net Periodic Benefits Cost:      
Service cost 40 47  
Interest cost 31 56  
Expected return on plan assets (134) (127)  
Amortization of prior service cost 0 0  
Amortization of actuarial (gain) loss (287) (199)  
Net periodic benefits costs under accounting standards (350) (223)  
Increase (Decrease) in Regulatory Assets and Liabilities 0 0  
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool (350) (223)  
SERP      
Components of Net Periodic Benefits Cost:      
Service cost 348 244  
Interest cost 229 247  
Expected return on plan assets 0 0  
Amortization of prior service cost 0 0  
Amortization of actuarial (gain) loss 419 211  
Net periodic benefits costs under accounting standards 996 702  
Increase (Decrease) in Regulatory Assets and Liabilities 0 0  
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool 996 $ 702  
Water Service Utility Operations [Member] | Pension Benefits | GOLDEN STATE WATER COMPANY      
Components of Net Periodic Benefits Cost:      
Increase (Decrease) in Regulatory Assets and Liabilities $ (351)