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California Water Service Group Stock Narrative (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Shares of California Water Service Group Sold     907,392
Proceeds from sale of California Water Service Group shares, before fees $ 0 $ 0 $ 33,938
Fees incurred on Sale of California Water Service Group shares     273
Gain on sale of California Water Service Group stock 0 0 18,966
Tax incurred on sale of California Water Service Group shares     7,776
Net gain on sale of California Water Service Group shares     11,190
Reclassification adjustment of unrealized holding gain on California Water Service Group shares 0 0 10,784
Shares of California Water Service Group held 385,120    
Investment in California Water Service Group 7,067 7,032  
Quoted Prices in Active Markets for Identical Assets (Level 1)
     
Investment in California Water Service Group 7,067 7,032  
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