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California Water Service Group Stock
 12 Months Ended
Dec. 31, 2013
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. 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, 2013, SJW Corp. held 385,120 shares of California Water Service Group. The following table summarizes the fair value of the Company's investment in California Water Service Group as of December 31, 2013 and 2012:

 
Balance as of
December 31, 2013
 
Quoted
Prices in
Active
Markets for
Identical
Assets
(Level 1)
 
Significant
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Assets:
 
 
 
 
 
 
 
Investment in California Water Service Group
$
8,885

 
$
8,885

 
—

 
—

 
Balance as of
December 31, 2012
 
Quoted
Prices in
Active
Markets for
Identical
Assets
(Level 1)
 
Significant
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Assets:
 
 
 
 
 
 
 
Investment in California Water Service Group
$
7,067

 
$
7,067

 
—

 
—