Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 46,889	$ 88,563
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax benefit of $200 in 2016 and $15 in 2015	9,866	(30,156)
Unrealized gain (loss) on derivative instruments, net of tax benefit (expense) of $4,274 in 2016 and ($935) in 2015	(7,185)	1,572
Comprehensive income	$ 49,570	$ 59,979