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Employee Benefit Plans: (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Components of Net Periodic Benefits Cost:        
Increase (Decrease) in Regulatory Assets and Liabilities     $ (8,802) $ (6,995)
GOLDEN STATE WATER COMPANY        
Components of Net Periodic Benefits Cost:        
Increase (Decrease) in Regulatory Assets and Liabilities     (8,489) (6,995)
Pension Benefits        
Components of Net Periodic Benefits Cost:        
Service cost $ 1,625 $ 1,372 3,250 2,780
Interest cost 1,712 1,986 3,424 3,940
Expected return on plan assets (3,134) (2,950) (6,268) (5,900)
Amortization of prior service cost 109 109 218 218
Amortization of actuarial (gain) loss 993 526 1,986 968
Net periodic benefits costs under accounting standards 1,305 1,043 2,610 2,006
Increase (Decrease) in Regulatory Assets and Liabilities (351) (148) (702) (241)
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool 954 895 1,908 1,765
Expected contributions in current fiscal year 3,500   3,500  
Pension Benefits | GOLDEN STATE WATER COMPANY        
Components of Net Periodic Benefits Cost:        
Regulatory adjustment — deferred (315)   (315)  
Pension Benefits | Bear Valley Electric Service, Inc.        
Components of Net Periodic Benefits Cost:        
Regulatory adjustment — deferred (102)   (102)  
Other Postretirement Benefits        
Components of Net Periodic Benefits Cost:        
Service cost 40 47 80 94
Interest cost 31 56 62 112
Expected return on plan assets (134) (127) (268) (254)
Amortization of prior service cost 0 0 0 0
Amortization of actuarial (gain) loss (287) (199) (574) (398)
Net periodic benefits costs under accounting standards (350) (223) (700) (446)
Increase (Decrease) in Regulatory Assets and Liabilities 0 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool (350) (223) (700) (446)
SERP        
Components of Net Periodic Benefits Cost:        
Service cost 348 244 696 488
Interest cost 229 247 458 494
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 0 0 0
Amortization of actuarial (gain) loss 419 211 838 422
Net periodic benefits costs under accounting standards 996 702 1,992 1,404
Increase (Decrease) in Regulatory Assets and Liabilities 0 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool 996 702 1,992 1,404
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) $ (148) $ (702) $ (241)