Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 45,991	$ 86,511
Other comprehensive income (loss):
Foreign currency translation adjustments	38,853	18,112
Unrealized gain (loss) on hedging activities, net of tax expense (benefit) of $458 and $(89), respectively	3,204	(622)
Other comprehensive income	42,057	17,490
Total comprehensive income	$ 88,048	$ 104,001