Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
(Benefit) provision for income taxes	$ (50,470)	$ 25,565	$ (38,406)	$ 40,884
(Loss) income before income taxes	$ (142,751)	$ 77,191	$ (94,254)	$ 137,498
Effective income tax rate	35.40%	33.10%	40.70%	29.70%
Unrecognized tax benefits	$ 64,700		$ 64,700		$ 37,100
Decrease in unrecognized tax benefits is reasonably possible	$ 8,000		$ 8,000