Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income	$ 75,464	$ 60,078
Other comprehensive income, net of tax:
Foreign currency translation adjustments, net of tax benefit (expense) of $52 and ($165)	(1,639)	3,664
Unrealized gain on derivative instruments, net of tax (expense) benefit of ($659) and $1,848	1,107	(3,421)
Comprehensive income	$ 74,932	$ 60,321