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Condensed Consolidated Statement of Income and Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Condensed Consolidated Statement of Income and Comprehensive Income [Abstract]        
Unrealized gain (loss) on investments, tax $ (346) $ 0 $ 1,185 $ 0