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California Water Service Group Stock
 12 Months Ended
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]  
California Water Service Group Stock
California Water Service Group Stock
SJW Corp. classifies its investment in California Water Service Group as available-for-sale. On June 30, 2014, SJW Corp. sold 125,969 shares of California Water Service Group for $3,056, before fees of $10. SJW Corp. recognized a gain on the sale of the stock of approximately $2,017, tax expense of approximately $822, for a net gain of $1,195. The unrealized holding gain associated with the shares sold, that was reclassified out of accumulated other comprehensive income was $1,171 and was based on the fair value of the stock as of March 31, 2014. As of December 31, 2014, SJW Corp. held 259,151 shares of California Water Service Group. The stock is carried at the quoted market price with the changes in unrealized gain or loss reported, net of tax, as a component of other comprehensive income.
As of December 31, 2014 and 2013, the fair value of the Company's investment in California Water Service Group was $6,378 and $8,885, respectively, and would be categorized as Level 1 of the fair value hierarchy.