CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net income	$ 30,291	$ 30,164
Other comprehensive income:
Foreign currency translation adjustment	4,831	3,815
Deferred income tax expense	(1,691)	(219)
Other comprehensive income, net of tax	3,140	3,596
Comprehensive income	$ 33,431	$ 33,760