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California Water Service Group Stock Narrative (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Shares of California Water Service Group held 385,120  
Investment in California Water Service Group $ 8,885 $ 7,067
Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Investment in California Water Service Group 8,885 7,067
Significant Observable Inputs (Level 2)
   
Investment in California Water Service Group 0 0
Significant Unobservable Inputs (Level 3)
   
Investment in California Water Service Group $ 0 $ 0