Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income	$ 32,358	$ 45,569	$ 89,554	$ 109,281
Foreign currency translation adjustment	7,703	(328)	23,616	(9,566)
Change in fair value on available-for-sale investments, net of tax expense of zero for the three and nine months of 2017, respectively, and $1,378 and $1,440 for the three and nine months of 2016, respectively	0	(2,249)	0	(2,359)
Other comprehensive income (loss), net of tax	7,703	(2,577)	23,616	(11,925)
Comprehensive income	$ 40,061	$ 42,992	$ 113,170	$ 97,356