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Employee Benefit Plans: (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Components of Net Periodic Benefits Cost:        
Increase (Decrease) in Regulatory Assets and Liabilities     $ (13,932) $ 12,240
GOLDEN STATE WATER COMPANY        
Components of Net Periodic Benefits Cost:        
Increase (Decrease) in Regulatory Assets and Liabilities     (13,932) 12,240
Pension Benefits        
Components of Net Periodic Benefits Cost:        
Service cost $ 986 $ 1,269 2,220 2,670
Interest cost 2,133 1,903 4,264 3,824
Expected return on plan assets (2,595) (2,795) (5,188) (5,586)
Amortization of prior service cost 109 0 218 0
Amortization of actuarial (gain) loss 351 283 710 628
Net periodic benefits costs under accounting standards 984 660 2,224 1,536
Increase (Decrease) in Regulatory Assets and Liabilities (342) 0 (342) 0
Expected contributions in current fiscal year 3,900   3,900  
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool 642 660 1,882 1,536
Pension Benefits | GOLDEN STATE WATER COMPANY        
Components of Net Periodic Benefits Cost:        
Regulatory adjustment — deferred     (2,900)  
Other Postretirement Benefits        
Components of Net Periodic Benefits Cost:        
Service cost 53 57 106 114
Interest cost 80 72 160 144
Expected return on plan assets (112) (123) (224) (246)
Amortization of prior service cost 0 0 0 0
Amortization of actuarial (gain) loss (150) (182) (300) (364)
Net periodic benefits costs under accounting standards (129) (176) (258) (352)
Increase (Decrease) in Regulatory Assets and Liabilities 0 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool (129) (176) (258) (352)
SERP        
Components of Net Periodic Benefits Cost:        
Service cost 298 274 596 548
Interest cost 267 222 534 444
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 0 0 0
Amortization of actuarial (gain) loss 118 262 236 524
Net periodic benefits costs under accounting standards 683 758 1,366 1,516
Increase (Decrease) in Regulatory Assets and Liabilities 0 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool $ 683 $ 758 $ 1,366 $ 1,516