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Employee Benefit Plans: (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Components of Net Periodic Benefits Cost:    
Regulatory adjustment — deferred $ 818,000 $ 1,371,000
Expected employer's contribution in 2014 8,400,000  
GSWC
    
Components of Net Periodic Benefits Cost:    
Regulatory adjustment — deferred 818,000 1,371,000
Pension Benefits
    
Components of Net Periodic Benefits Cost:    
Service cost 1,487,000 1,864,000
Interest cost 1,915,000 1,731,000
Expected return on plan assets (2,215,000) (1,893,000)
Amortization of transition 0 0
Amortization of prior service cost (benefit) 30,000 30,000
Amortization of actuarial (gain) loss 7,000 711,000
Net periodic pension cost under accounting standards 1,224,000 2,443,000
Regulatory adjustment — deferred 300,000 (510,000)
Total expense recognized, before allocation to overhead pool 1,524,000 1,933,000
Pension Benefits | GSWC
    
Components of Net Periodic Benefits Cost:    
Regulatory adjustment — deferred 4,400,000  
Other Postretirement Benefits
    
Components of Net Periodic Benefits Cost:    
Service cost 99,000 106,000
Interest cost 130,000 113,000
Expected return on plan assets (113,000) (95,000)
Amortization of transition 104,000 105,000
Amortization of prior service cost (benefit) (50,000) (50,000)
Amortization of actuarial (gain) loss (66,000) 0
Net periodic pension cost under accounting standards 104,000 179,000
Regulatory adjustment — deferred 0 0
Total expense recognized, before allocation to overhead pool 104,000 179,000
SERP
    
Components of Net Periodic Benefits Cost:    
Service cost 192,000 201,000
Interest cost 154,000 129,000
Expected return on plan assets 0 0
Amortization of transition 0 0
Amortization of prior service cost (benefit) 40,000 40,000
Amortization of actuarial (gain) loss 35,000 85,000
Net periodic pension cost under accounting standards 421,000 455,000
Regulatory adjustment — deferred 0 0
Total expense recognized, before allocation to overhead pool $ 421,000 $ 455,000