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Employee Benefit Plans: (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Pension Benefits        
Components of Net Periodic Benefits Cost:        
Service cost $ 1,452 $ 1,335 $ 3,138 $ 2,822
Interest cost 1,905 1,845 3,844 3,760
Expected return on plan assets (2,452) (2,235) (4,898) (4,450)
Amortization of transition 0 0 0 0
Amortization of prior service cost (benefit) 30 29 60 59
Amortization of actuarial (gain) loss 427 (7) 896 0
Net periodic pension cost under accounting standards 1,362 967 3,040 2,191
Regulatory adjustment — deferred 251 449 262 749
Total expense recognized, before allocation to overhead pool 1,613 1,416 3,302 2,940
Defined Benefit Plan, Contributions by Employer     919  
Expected contributions in current fiscal year     6,700  
Pension Benefits | GSWC        
Components of Net Periodic Benefits Cost:        
Regulatory adjustment — deferred     2,400  
Other Postretirement Benefits        
Components of Net Periodic Benefits Cost:        
Service cost 95 99 190 198
Interest cost 114 130 228 260
Expected return on plan assets (123) (113) (246) (226)
Amortization of transition 0 104 0 208
Amortization of prior service cost (benefit) (50) (50) (100) (100)
Amortization of actuarial (gain) loss (53) (66) (106) (132)
Net periodic pension cost under accounting standards (17) 104 (34) 208
Regulatory adjustment — deferred 0 0 0 0
Total expense recognized, before allocation to overhead pool (17) 104 (34) 208
SERP        
Components of Net Periodic Benefits Cost:        
Service cost 204 192 408 384
Interest cost 163 154 326 308
Expected return on plan assets 0 0 0 0
Amortization of transition 0 0 0 0
Amortization of prior service cost (benefit) 29 40 58 80
Amortization of actuarial (gain) loss 108 35 216 70
Net periodic pension cost under accounting standards 504 421 1,008 842
Regulatory adjustment — deferred 0 0 0 0
Total expense recognized, before allocation to overhead pool $ 504 $ 421 $ 1,008 $ 842