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Employee Benefit Plans: (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Components of Net Periodic Benefits Cost:        
Increase (Decrease) in Regulatory Assets and Liabilities     $ (8,319) $ (367)
GOLDEN STATE WATER COMPANY        
Components of Net Periodic Benefits Cost:        
Increase (Decrease) in Regulatory Assets and Liabilities     (7,316) 582
Pension Benefits        
Components of Net Periodic Benefits Cost:        
Service cost $ 1,487 $ 1,390 4,737 4,170
Interest cost 1,700 1,970 5,124 5,910
Expected return on plan assets (3,137) (2,950) (9,405) (8,850)
Amortization of prior service cost 109 109 327 327
Amortization of actuarial (gain) loss 876 484 2,862 1,452
Net periodic benefits costs under accounting standards 1,035 1,003 3,645 3,009
Increase (Decrease) in Regulatory Assets and Liabilities (254) (121) (956) (362)
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool 781 882 2,689 2,647
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 (60)   (60)  
Pension Benefits | Bear Valley Electric Service, Inc.        
Components of Net Periodic Benefits Cost:        
Regulatory adjustment — deferred (184)   (184)  
Other Postretirement Benefits        
Components of Net Periodic Benefits Cost:        
Service cost 31 35 111 129
Interest cost 22 44 84 156
Expected return on plan assets (134) (130) (402) (384)
Amortization of prior service cost 0 0 0 0
Amortization of actuarial (gain) loss (488) (334) (1,062) (732)
Net periodic benefits costs under accounting standards (569) (385) (1,269) (831)
Increase (Decrease) in Regulatory Assets and Liabilities 0 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool (569) (385) (1,269) (831)
SERP        
Components of Net Periodic Benefits Cost:        
Service cost 348 244 1,044 732
Interest cost 229 247 687 741
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 1,257 633
Net periodic benefits costs under accounting standards 996 702 2,988 2,106
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 2,988 2,106
Water Service Utility Operations [Member] | Pension Benefits | GOLDEN STATE WATER COMPANY        
Components of Net Periodic Benefits Cost:        
Increase (Decrease) in Regulatory Assets and Liabilities $ (254) $ (121) $ (956) $ (362)