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Condensed Consolidated Statement of Operations and Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Condensed Consolidated Statement of Operations and Comprehensive Income (Loss) [Abstract]    
Unrealized gain (loss) on investments, net of tax benefit (expense) of $ 94 $ (1,182)