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Utility Plant and Intangible Assets (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Intangible assets      
Total amortized intangible assets $ 35,405,000 $ 35,136,000  
Less - accumulated amortization (22,530,000) (20,715,000)  
Intangible assets, net of amortization 12,875,000 14,421,000  
Unamortized intangible assets 427,000 [1] 427,000 [1]  
Amortization of intangible assets 1,900,000 2,400,000 2,500,000
Estimated future consolidated amortization expenses related to intangible assets      
2014 2,436,000    
2015 1,962,000    
2016 1,487,000    
2017 1,487,000    
2018 1,487,000    
Total 8,859,000    
Conservation
      
Intangible assets      
Total amortized intangible assets 9,496,000 9,496,000  
Water and water service rights
      
Intangible assets      
Total amortized intangible assets 8,695,000 [2] 8,695,000 [2]  
Water planning studies
      
Intangible assets      
Total amortized intangible assets 17,214,000 16,945,000  
GSWC
      
Intangible assets      
Total amortized intangible assets 34,834,000 34,565,000  
Less - accumulated amortization (22,459,000) (20,656,000)  
Intangible assets, net of amortization 12,375,000 13,909,000  
Unamortized intangible assets 409,000 [1] 409,000 [1]  
Amortization of intangible assets 1,900,000 2,400,000 2,500,000
GSWC | Conservation
      
Intangible assets      
Weighted Average Amortization Period 18 years    
Total amortized intangible assets 9,496,000 9,496,000  
GSWC | Water and water service rights
      
Intangible assets      
Weighted Average Amortization Period 25 years    
Total amortized intangible assets 8,124,000 [2] 8,124,000 [2]  
GSWC | Water planning studies
      
Intangible assets      
Weighted Average Amortization Period 11 years    
Total amortized intangible assets $ 17,214,000 $ 16,945,000  
[1] The intangible assets not subject to amortization primarily consist of organization and consent fees.
[2] Includes intangible assets of $571,000 for contracted services included in "Other Property and Investments" on the consolidated balance sheets as of December 31, 2013 and 2012.