Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Net and Comprehensive Income (Unaudited) (Parenthetical)

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Condensed Consolidated Statements of Net and Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement [Abstract]        
Unrealized gains on marketable securities, tax $ 111 $ 271 $ 176 $ 721
Foreign currency translation (loss) gain, tax $ 0 $ 0 $ 0 $ 0