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	$ 212,948	$ 455,361	$ 454,029
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax benefit of $195, $643 and $65	(19,773)	(38,571)	(44,371)
Unrealized gain (loss) on derivative instruments, net of tax benefit (expense) of $936, ($1,975) and $970	(1,572)	3,320	(1,631)
Comprehensive income	$ 191,603	$ 420,110	$ 408,027