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Employee Benefit Plans: (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Pension Benefits    
Components of Net Periodic Benefits Cost:    
Service cost $ 1,232 $ 1,686
Interest cost 1,930 1,939
Expected return on plan assets (2,460) (2,446)
Amortization of transition 0 0
Amortization of prior service cost (benefit) 12 30
Amortization of actuarial (gain) loss 127 469
Net periodic pension cost under accounting standards 841 1,678
Regulatory adjustment — deferred 359 11
Total expense recognized, before allocation to overhead pool 1,200 1,689
Expected contributions in current fiscal year 5,500  
Pension Benefits | GSWC    
Components of Net Periodic Benefits Cost:    
Regulatory adjustment — deferred 1,800  
Other Postretirement Benefits    
Components of Net Periodic Benefits Cost:    
Service cost 68 95
Interest cost 97 114
Expected return on plan assets (122) (123)
Amortization of transition 0 0
Amortization of prior service cost (benefit) (9) (50)
Amortization of actuarial (gain) loss (150) (53)
Net periodic pension cost under accounting standards (116) (17)
Regulatory adjustment — deferred 0 0
Total expense recognized, before allocation to overhead pool (116) (17)
SERP    
Components of Net Periodic Benefits Cost:    
Service cost 200 204
Interest cost 186 163
Expected return on plan assets 0 0
Amortization of transition 0 0
Amortization of prior service cost (benefit) 6 29
Amortization of actuarial (gain) loss 73 108
Net periodic pension cost under accounting standards 465 504
Regulatory adjustment — deferred 0 0
Total expense recognized, before allocation to overhead pool $ 465 $ 504