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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement [Abstract]      
Unrealized loss on investment, taxes $ (141) $ 208 $ 741
Reclassification adjustment for gain on investment, taxes $ 0 $ 805 $ 0