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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement Of Other Comprehensive Income [Abstract]    
Net income $ 12,222 $ 6,145
Other comprehensive income (loss), net of tax    
Foreign currency translation   2
Change in fair value of marketable securities (84) 124
Adjustment for net losses (gains) realized and included in net income   10
Total change in unrealized gains (losses) on marketable securities (84) 134
Other comprehensive income (loss) (84) 136
Comprehensive income $ 12,138 $ 6,281