Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income	$ 105,933	$ 130,136	$ 78,716
Other comprehensive income:
Foreign currency translation adjustment	2,960	(1,198)	496
Deferred income tax (expense) benefit	(1,035)	1,447	599
Other comprehensive income, net of tax	1,925	249	1,095
Comprehensive income	$ 107,858	$ 130,385	$ 79,811