Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 98,678	$ 88,549	$ 192,831	$ 163,658
Other comprehensive income:
Foreign currency translation gain (loss), net of tax	6,847	6,832	(86,210)	22,759
Total other comprehensive income (loss)	6,847	6,832	(86,210)	22,759
Total comprehensive income	$ 105,525	$ 95,381	$ 106,621	$ 186,417