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	$ 12,844	$ 7,358	$ 30,612	$ 18,143
Other comprehensive income (loss):
Foreign currency translation adjustments	689	(376)	1,991	(1,028)
Unrealized gain (loss) on marketable securities	133	(548)	373	1,159
Other comprehensive income (loss)	822	(924)	2,364	131
Income tax effect of unrealized gain or loss on marketable securities	(51)	139	(143)	(442)
Other comprehensive income (loss), net of tax	771	(785)	2,221	(311)
Comprehensive income (loss), net of tax	$ 13,615	$ 6,573	$ 32,833	$ 17,832