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Earnings Per Share and Capital Stock (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Additional disclosure      
Common Shares issued under DRP and the 2000 and 2008 Employee Plans 114,821 77,038 138,868
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans     $ 1,658,000
Common Shares authorized for issuance but unissued under DRP 1,055,948    
Common Shares authorized for issuance but unissued under 401(k) Plan 387,300    
Common Shares issued as a result of the exercise of stock options 131,448 819,400 177,426
Value of Common Shares issued as a result of the exercise of stock options 2,111,000 13,295,000 2,350,000
Common Shares repurchased in the open market under DRP and 401(k) Plan 598,573 1,351,934 882,820
Amount available for issuance of securities under registration statement 115,000,000    
GSWC
      
Additional disclosure      
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans $ 0 $ 895,000 $ 10,000,000