CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
COMPREHENSIVE INCOME:
Net income	$ 63,089	$ 45,329	$ 118,952	$ 93,663
Foreign currency translation adjustments, net of tax	(5,490)	(6,452)	(11,261)	(2,380)
Total comprehensive income	$ 57,599	$ 38,877	$ 107,691	$ 91,283