Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net income	$ 31,376	$ 33,770	$ 57,196	$ 63,713
Foreign currency translation adjustment	12,331	(12,653)	15,913	(9,238)
Change in fair value on available-for-sale investments, net of tax expense (benefit) of zero and zero for the three and six months of 2017, respectively, and 1,380 and ($61) for the three and six months of 2016, respectively	0	2,251	0	(110)
Other comprehensive income (loss), net of tax	12,331	(10,402)	15,913	(9,348)
Comprehensive Income	$ 43,707	$ 23,368	$ 73,109	$ 54,365