Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 140,826	$ 113,144	$ 318,632	$ 268,612
Other comprehensive income, net of tax:
Foreign currency translation adjustments, net of tax benefit (expense) of $91 and ($48) in 2014 and $60 and $281 in 2013	(22,424)	8,982	(22,576)	2,655
Unrealized gain (loss) on derivative instruments, net of tax (expense) benefit of ($1,549) and ($945) in 2014 and $672 and ($1,124) in 2013	2,603	(1,131)	1,588	1,889
Comprehensive income	$ 121,005	$ 120,995	$ 297,644	$ 273,156