Income Taxes - Components of Income and Provision for (Benefit from) Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Components of income (loss) before provision for (benefit from) income taxes
United States									$ 330,340	$ (147,860)	$ (272,326)
Foreign									(346,029)	80,494	(285,474)
Loss before (benefit from) provision for income taxes	$ 112,442	$ (417,170)	$ 35,506	$ 253,533	$ 20,306	$ (39,034)	$ (18,021)	$ (30,617)	(15,689)	(67,366)	(557,800)
Current taxes:
United States									11,559	(3,821)	25,623
Foreign									3,576	1,794	831
State									5,025	1,836	3,629
Total current taxes									20,160	(191)	30,083
Deferred taxes:
United States									(113,805)	18,659	497
Foreign									(3,222)	(3,359)	(355)
State									(10,457)	1,556	156
Total deferred taxes									(127,484)	16,856	298
(Benefit from) provision for income taxes	$ 10,257	$ (125,903)	$ 4,337	$ 3,985	$ (7,453)	$ 503	$ 18,130	$ 5,485	$ (107,324)	$ 16,665	$ 30,381