Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income	$ 30,148	$ 23,898	$ 64,031	$ 86,106
Other comprehensive income (loss):
Foreign currency translation adjustment	1,016	2,832	(1,712)	1,661
Deferred income tax (expense) benefit	(356)	(992)	599	(582)
Other comprehensive income (loss), net of tax	660	1,840	(1,113)	1,079
Comprehensive income	$ 30,808	$ 25,738	$ 62,918	$ 87,185