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Sale of California Water Service (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]          
Available for sale marketable security, shares sold (shares) 125,969        
Sale proceeds $ 3,056        
Fees incurred on sale 10        
Gain on sale of California Water Service Group stock 2,017 0 0 2,017 0
Income tax expense on realized gain (loss) 822        
Gain (loss) on sale of securities 1,195        
Reclassified out of accumulated other comprehensive income $ 1,171 $ 0 $ 0 $ 1,171 $ 0
Number of securities held (shares)   259,151   259,151