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Employee Benefit Plans: (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Pension Benefits    
Components of Net Periodic Benefits Cost:    
Service cost $ 1,251 $ 1,232
Interest cost 1,967 1,930
Expected return on plan assets (2,610) (2,460)
Amortization of prior service cost (benefit) 0 12
Amortization of actuarial (gain) loss 209 127
Net periodic pension cost under accounting standards 817 841
Regulatory adjustment — deferred 433 359
Total expense recognized, before allocation to overhead pool 1,250 1,200
Expected contributions in current fiscal year 6,200  
Pension Benefits | GSWC    
Components of Net Periodic Benefits Cost:    
Regulatory adjustment — deferred 900  
Other Postretirement Benefits    
Components of Net Periodic Benefits Cost:    
Service cost 59 68
Interest cost 85 97
Expected return on plan assets (122) (122)
Amortization of prior service cost (benefit) 0 (9)
Amortization of actuarial (gain) loss (170) (150)
Net periodic pension cost under accounting standards (148) (116)
Regulatory adjustment — deferred 0 0
Total expense recognized, before allocation to overhead pool (148) (116)
SERP    
Components of Net Periodic Benefits Cost:    
Service cost 232 200
Interest cost 223 186
Expected return on plan assets 0 0
Amortization of prior service cost (benefit) 3 6
Amortization of actuarial (gain) loss 194 73
Net periodic pension cost under accounting standards 652 465
Regulatory adjustment — deferred 0 0
Total expense recognized, before allocation to overhead pool $ 652 $ 465