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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]      
Unrealized loss on investment, taxes $ 657 $ (141) $ 208
Reclassification adjustment for gain on investment, taxes $ 1,198 $ 0 $ 805