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Employee Benefit Plans: (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Pension Benefits
        
Pension Plan's funded status and amounts recognized in balance sheets and the components of net pension cost and accrued post-retirement liability        
Defined Benefit Plan, Expected Contributions in Current Fiscal Year     $ 8,200,000  
Components of Net Periodic Benefits Cost:        
Service cost 1,411,000 1,742,000 4,233,000 5,226,000
Interest cost 1,880,000 1,727,000 5,640,000 5,181,000
Expected return on plan assets (2,225,000) (1,894,000) (6,675,000) (5,682,000)
Amortization of transition 0 0 0 0
Amortization of prior service cost (benefit) 30,000 30,000 89,000 90,000
Amortization of actuarial (gain) loss 0 720,000 0 2,160,000
Net periodic pension cost under accounting standards 1,096,000 2,325,000 3,287,000 6,975,000
Regulatory adjustment — deferred 374,000 (521,000) 1,123,000 (1,440,000)
Total expense recognized, before allocation to overhead pool 1,470,000 1,804,000 4,410,000 5,535,000
Pension Benefits | GSWC
        
Components of Net Periodic Benefits Cost:        
Regulatory adjustment — deferred     3,200,000  
Other Postretirement Benefits
        
Components of Net Periodic Benefits Cost:        
Service cost 63,000 106,000 261,000 318,000
Interest cost 111,000 113,000 371,000 339,000
Expected return on plan assets (114,000) (95,000) (340,000) (285,000)
Amortization of transition 105,000 105,000 313,000 315,000
Amortization of prior service cost (benefit) (50,000) (50,000) (150,000) (150,000)
Amortization of actuarial (gain) loss (115,000) 0 (247,000) 0
Net periodic pension cost under accounting standards 0 179,000 208,000 537,000
Regulatory adjustment — deferred 0 0 0 0
Total expense recognized, before allocation to overhead pool 0 179,000 208,000 537,000
SERP
        
Components of Net Periodic Benefits Cost:        
Service cost 192,000 201,000 576,000 603,000
Interest cost 154,000 129,000 462,000 387,000
Expected return on plan assets 0 0 0 0
Amortization of transition 0 0 0 0
Amortization of prior service cost (benefit) 40,000 40,000 120,000 120,000
Amortization of actuarial (gain) loss 35,000 85,000 105,000 255,000
Net periodic pension cost under accounting standards 421,000 455,000 1,263,000 1,365,000
Regulatory adjustment — deferred 0 0 0 0
Total expense recognized, before allocation to overhead pool $ 421,000 $ 455,000 $ 1,263,000 $ 1,365,000