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Employee Benefit Plans: (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Components of Net Periodic Benefits Cost:        
Contributions by employer     $ 6,000  
Pension Benefits        
Components of Net Periodic Benefits Cost:        
Service cost $ 1,335 $ 1,250 4,005 $ 3,750
Interest cost 1,912 1,976 5,736 5,928
Expected return on plan assets (2,793) (2,428) (8,379) (7,278)
Amortization of prior service cost (benefit) 0 0 0 0
Amortization of actuarial (gain) loss 314 231 942 693
Net periodic pension cost under accounting standards 768 1,029 2,304 3,093
Regulatory adjustment — deferred 0 (266) 0 (791)
Total expense recognized, before surcharges and allocation to overhead pool 768 1,295 2,304 3,884
Pension Benefits | Golden State Water Company        
Components of Net Periodic Benefits Cost:        
Regulatory adjustment — deferred     2,500  
Other Postretirement Benefits        
Components of Net Periodic Benefits Cost:        
Service cost 48 53 162 171
Interest cost 75 73 219 243
Expected return on plan assets (123) (107) (369) (351)
Amortization of prior service cost (benefit) 0 0 0 0
Amortization of actuarial (gain) loss (212) (242) (576) (582)
Net periodic pension cost under accounting standards (212) (223) (564) (519)
Regulatory adjustment — deferred 0 0 0 0
Total expense recognized, before surcharges and allocation to overhead pool (212) (223) (564) (519)
SERP        
Components of Net Periodic Benefits Cost:        
Service cost 274 232 822 696
Interest cost 222 223 666 669
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (benefit) 0 3 0 9
Amortization of actuarial (gain) loss 262 194 786 582
Net periodic pension cost under accounting standards 758 652 2,274 1,956
Regulatory adjustment — deferred 0 0 0 0
Total expense recognized, before surcharges and allocation to overhead pool $ 758 $ 652 $ 2,274 $ 1,956