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	$ 59,648	$ 40,514	$ 156,128	$ 109,563
Other comprehensive income:
Foreign currency translation adjustment gain (loss), net of tax	8,774	(4,885)	8,649	(545)
Total other comprehensive income (loss)	8,774	(4,885)	8,649	(545)
Total comprehensive income	$ 68,422	$ 35,629	$ 164,777	$ 109,018