Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income	$ 23,642	$ 14,373	$ 53,132	$ 36,146
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of $0 tax in 2017 and 2016	1,500	(52)	3,992	(1,593)
Change in unrealized gain (loss) on available-for-sale securities, net of $0 tax in 2017 and 2016	222	(13)	565	190
Total other comprehensive income (loss), net of tax	1,722	(65)	4,557	(1,403)
Comprehensive income	$ 25,364	$ 14,308	$ 57,689	$ 34,743