Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net income	$ 69,823	$ 48,729	$ 129,901	$ 96,039
Other comprehensive income:
Foreign currency translation adjustments, net of tax benefit of $295 and $130 in 2012 and $4,160 and $3,791 in 2011	(5,734)	5,322	(2,070)	8,579
Unrealized gain (loss) on derivative instruments, net of tax (expense) benefit of ($778) and $1,070 in 2012 and $701 and $1,956 in 2011	1,775	(1,138)	(1,646)	(3,289)
Comprehensive income	$ 65,864	$ 52,913	$ 126,185	$ 101,329