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Employee Benefit Plans: (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Components of Net Periodic Benefits Cost:    
Increase (Decrease) in Regulatory Assets and Liabilities $ (2,976) $ (3,987)
GOLDEN STATE WATER COMPANY    
Components of Net Periodic Benefits Cost:    
Increase (Decrease) in Regulatory Assets and Liabilities (2,976) (3,987)
Pension Benefits    
Components of Net Periodic Benefits Cost:    
Service cost 1,408 1,234
Interest cost 1,954 2,131
Expected return on plan assets (2,950) (2,593)
Amortization of prior service cost 109 109
Amortization of actuarial (gain) loss 442 359
Net periodic benefits costs under accounting standards 963 1,240
Increase (Decrease) in Regulatory Assets and Liabilities (93) 0
Expected contributions in current fiscal year 3,700  
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool 870 1,240
Pension Benefits | GOLDEN STATE WATER COMPANY    
Components of Net Periodic Benefits Cost:    
Regulatory adjustment — deferred (2,700)  
Other Postretirement Benefits    
Components of Net Periodic Benefits Cost:    
Service cost 47 53
Interest cost 56 80
Expected return on plan assets (127) (112)
Amortization of prior service cost 0 0
Amortization of actuarial (gain) loss (199) (150)
Net periodic benefits costs under accounting standards (223) (129)
Increase (Decrease) in Regulatory Assets and Liabilities 0 0
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool (223) (129)
SERP    
Components of Net Periodic Benefits Cost:    
Service cost 244 298
Interest cost 247 267
Expected return on plan assets 0 0
Amortization of prior service cost 0 0
Amortization of actuarial (gain) loss 211 118
Net periodic benefits costs under accounting standards 702 683
Increase (Decrease) in Regulatory Assets and Liabilities 0 0
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool 702 $ 683
Water Service Utility Operations [Member] | Pension Benefits | GOLDEN STATE WATER COMPANY    
Components of Net Periodic Benefits Cost:    
Increase (Decrease) in Regulatory Assets and Liabilities $ 93