Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
COMPREHENSIVE INCOME:
Net income	$ 75,140	$ 63,089	$ 136,691	$ 118,952
Foreign currency translation adjustments, net of tax	1,881	(5,490)	2,286	(11,261)
Total comprehensive income	$ 77,021	$ 57,599	$ 138,977	$ 107,691