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Employee Benefit Plans: (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Pension Benefits          
Components of Net Periodic Benefits Cost:          
Service cost   $ 1,250 $ 1,274 $ 3,750 $ 3,822
Interest cost   1,976 1,978 5,928 5,934
Expected return on plan assets   (2,428) (2,457) (7,278) (7,377)
Amortization of prior service cost (benefit)   0 12 0 36
Amortization of actuarial (gain) loss   231 228 693 684
Net periodic pension cost under accounting standards   1,029 1,035 3,093 3,099
Regulatory adjustment — deferred   266 221 791 644
Total expense recognized, before surcharges and allocation to overhead pool   1,295 1,256 3,884 3,743
Expected contributions in current fiscal year   6,500   6,500  
Pension Benefits | GOLDEN STATE WATER COMPANY          
Components of Net Periodic Benefits Cost:          
Regulatory adjustment — deferred $ (1,100)        
Other Postretirement Benefits          
Components of Net Periodic Benefits Cost:          
Service cost   53 68 171 204
Interest cost   73 97 243 291
Expected return on plan assets   (107) (122) (351) (366)
Amortization of prior service cost (benefit)   0 (9) 0 (27)
Amortization of actuarial (gain) loss   (242) (150) (582) (450)
Net periodic pension cost under accounting standards   (223) (116) (519) (348)
Regulatory adjustment — deferred   0 0 0 0
Total expense recognized, before surcharges and allocation to overhead pool   (223) (116) (519) (348)
SERP          
Components of Net Periodic Benefits Cost:          
Service cost   232 200 696 600
Interest cost   223 186 669 558
Expected return on plan assets   0 0 0 0
Amortization of prior service cost (benefit)   3 6 9 18
Amortization of actuarial (gain) loss   194 73 582 219
Net periodic pension cost under accounting standards   652 465 1,956 1,395
Regulatory adjustment — deferred   0 0 0 0
Total expense recognized, before surcharges and allocation to overhead pool   $ 652 $ 465 $ 1,956 $ 1,395