Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ 94,345	$ 67,637	$ 224,246	$ 163,676
Other comprehensive income:
Foreign currency translation adjustments, net of tax (expense) benefit of ($478) and ($348) in 2012 and $2,527 and $6,318 in 2011	4,997	(4,189)	2,927	4,390
Unrealized (loss) gain on derivative instruments, net of tax benefit (expense) of $997 and $2,067 in 2012 and ($7,063) and ($5,105) in 2011	(1,750)	11,878	(3,396)	8,588
Comprehensive income	$ 97,592	$ 75,326	$ 223,777	$ 176,654