Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 114,185	$ 98,678	$ 224,157	$ 192,831
Other comprehensive (loss) income:
Foreign currency translation (loss) gain, net of tax	(20,132)	59,016	11,070	(100,938)
Total other comprehensive (loss) income	(20,132)	59,016	11,070	(100,938)
Total comprehensive income	$ 94,053	$ 157,694	$ 235,227	$ 91,893