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Employee Benefit Plans: (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Pension Benefits          
Components of Net Periodic Benefits Cost:          
Service cost   $ 1,249 $ 1,316 $ 2,500 $ 2,548
Interest cost   1,985 2,026 3,952 3,956
Expected return on plan assets   (2,240) (2,460) (4,850) (4,920)
Amortization of prior service cost (benefit)   0 12 0 24
Amortization of actuarial (gain) loss   253 329 462 456
Net periodic pension cost under accounting standards   1,247 1,223 2,064 2,064
Regulatory adjustment — deferred   92 64 525 423
Total expense recognized, before surcharges and allocation to overhead pool   1,339 1,287 2,589 2,487
Expected contributions in current fiscal year $ 6,500 6,500   6,500  
Pension Benefits | GOLDEN STATE WATER COMPANY          
Components of Net Periodic Benefits Cost:          
Regulatory adjustment — deferred $ 259        
Other Postretirement Benefits          
Components of Net Periodic Benefits Cost:          
Service cost   59 68 118 136
Interest cost   85 97 170 194
Expected return on plan assets   (122) (122) (244) (244)
Amortization of prior service cost (benefit)   0 (9) 0 (18)
Amortization of actuarial (gain) loss   (170) (150) (340) (300)
Net periodic pension cost under accounting standards   (148) (116) (296) (232)
Regulatory adjustment — deferred   0 0 0 0
Total expense recognized, before surcharges and allocation to overhead pool   (148) (116) (296) (232)
SERP          
Components of Net Periodic Benefits Cost:          
Service cost   232 200 464 400
Interest cost   223 186 446 372
Expected return on plan assets   0 0 0 0
Amortization of prior service cost (benefit)   3 6 6 12
Amortization of actuarial (gain) loss   194 73 388 146
Net periodic pension cost under accounting standards   652 465 1,304 930
Regulatory adjustment — deferred   0 0 0 0
Total expense recognized, before surcharges and allocation to overhead pool   $ 652 $ 465 $ 1,304 $ 930