Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 116,770	$ 95,509	$ 309,601	$ 259,167
Other comprehensive income:
Foreign currency translation loss, net of tax	(89,467)	(68,478)	(175,677)	(45,719)
Total other comprehensive loss	(89,467)	(68,478)	(175,677)	(45,719)
Total comprehensive income	$ 27,303	$ 27,031	$ 133,924	$ 213,448