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Condensed Consolidated Statement of Operations and Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Condensed Consolidated Statement of Operations and Comprehensive Income (Loss) [Abstract]        
Unrealized gain (loss) on investments, tax $ 348 $ 0 $ 1,531 $ 0