CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 232,894	$ 99,857	$ 24,012
Other comprehensive income (loss), net of tax:
Unrealized gain on derivative instruments and other assets	3,479	612	7,407
Foreign currency translation adjustments	0	48,917	(22,270)
Equity in unrealized loss of an investee	0	0	(22)
Total comprehensive income	$ 236,373	$ 149,386	$ 9,127