Income Taxes - Components of Income and Provision for (Benefit from) Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Components of income (loss) before provision for (benefit from) income taxes
United States									$ 812,086	$ 330,340	$ (147,860)
Foreign									(211,845)	(346,029)	80,494
Income (loss) before (benefit from) provision for income taxes	$ 32,497	$ 136,511	$ 216,591	$ 214,642	$ 112,442	$ (417,170)	$ 35,506	$ 253,533	600,241	(15,689)	(67,366)
Current taxes:
United States									772	11,559	(3,821)
Foreign									15,600	3,576	1,794
State									9,018	5,025	1,836
Total current taxes									25,390	20,160	(191)
Deferred taxes:
United States									(1,105,053)	(113,805)	18,659
Foreign									(364,919)	(3,222)	(3,359)
State									(42,280)	(10,457)	1,556
Total deferred taxes									(1,512,252)	(127,484)	16,856
(Benefit from) provision for income taxes	$ (1,492,599)	$ 8,055	$ 10,341	$ (12,659)	$ 10,257	$ (125,903)	$ 4,337	$ 3,985	$ (1,486,862)	$ (107,324)	$ 16,665