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Employee Benefit Plans: (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Pension Benefits        
Components of Net Periodic Benefits Cost:        
Service cost $ 1,316 $ 1,452 $ 2,548 $ 3,138
Interest cost 2,026 1,905 3,956 3,844
Expected return on plan assets (2,460) (2,452) (4,920) (4,898)
Amortization of transition 0 0 0 0
Amortization of prior service cost (benefit) 12 30 24 60
Amortization of actuarial (gain) loss 329 427 456 896
Net periodic pension cost under accounting standards 1,223 1,362 2,064 3,040
Regulatory adjustment — deferred 64 251 423 262
Total expense recognized, before allocation to overhead pool 1,287 1,613 2,487 3,302
Expected contributions in current fiscal year     5,300  
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 95 136 190
Interest cost 97 114 194 228
Expected return on plan assets (122) (123) (244) (246)
Amortization of transition 0 0 0 0
Amortization of prior service cost (benefit) (9) (50) (18) (100)
Amortization of actuarial (gain) loss (150) (53) (300) (106)
Net periodic pension cost under accounting standards (116) (17) (232) (34)
Regulatory adjustment — deferred 0 0 0 0
Total expense recognized, before allocation to overhead pool (116) (17) (232) (34)
SERP        
Components of Net Periodic Benefits Cost:        
Service cost 200 204 400 408
Interest cost 186 163 372 326
Expected return on plan assets 0 0 0 0
Amortization of transition 0 0 0 0
Amortization of prior service cost (benefit) 6 29 12 58
Amortization of actuarial (gain) loss 73 108 146 216
Net periodic pension cost under accounting standards 465 504 930 1,008
Regulatory adjustment — deferred 0 0 0 0
Total expense recognized, before allocation to overhead pool $ 465 $ 504 $ 930 $ 1,008