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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
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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

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