CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 19,013	$ 50,777	$ 91,919	$ 143,654
Other comprehensive loss, net of tax:
Foreign currency translation adjustments	(8,852)	(33,099)	(30,204)	(43,792)
Total comprehensive income	$ 10,161	$ 17,678	$ 61,715	$ 99,862