CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 87,844	$ 12,616	$ 134,246	$ 26,246
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on derivative instruments and other assets	780	958	1,453	(1,664)
Foreign currency translation adjustments	0	65,307	0	48,917
Total comprehensive income	$ 88,624	$ 78,881	$ 135,699	$ 73,499