Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 452,385	$ 362,431	$ 368,707
Other comprehensive loss:
Foreign currency translation loss, net of tax	(95,592)	(279,303)	(223,691)
Total other comprehensive loss	(95,592)	(279,303)	(223,691)
Total comprehensive income	$ 356,793	$ 83,128	$ 145,016