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Fair Value of Financial Instruments: (Details) (USD $)
Sep. 30, 2014
Dec. 31, 2013
GSWC | Carrying Amount
   
Financial liabilities:    
Long-term debt-GSWC $ 317,099,000 $ 332,377,000
GSWC | Total
   
Financial liabilities:    
Long-term debt-GSWC 419,881,000 412,590,000
Mutual Funds | Level 1
   
Fair value of financial instruments    
Investments $ 8,700,000