Income Taxes - Narrative (Details) - USD ($)	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	Dec. 31, 2015
Tax Carryforwards
Income tax (benefit) resulting in the release of valuation allowance	$ (1,560,000,000)
(Benefit from) provision for income taxes	(1,492,599,000)	$ 8,055,000	$ 10,341,000	$ (12,659,000)	$ 10,257,000	$ (125,903,000)	$ 4,337,000	$ 3,985,000	$ (1,486,862,000)	$ (107,324,000)	$ 16,665,000
Increase (decrease) in valuation allowance										(178,200,000)	14,800,000
Deferred tax liabilities recognized in other liabilities, excluding current portion	0				6,341,000				0	6,341,000
Operating loss carryforwards	2,900,000,000				775,500,000				2,900,000,000	775,500,000
Tax credit carryforwards	350,700,000				134,900,000				350,700,000	134,900,000
Valuation allowance	168,491,000				1,552,942,000				168,491,000	1,552,942,000
Unrecognized tax benefits	19,549,000				3,814,000				19,549,000	3,814,000	0	$ 425,000
Income tax penalties and interest accrued	0								0
Variable Interest Entity, Primary Beneficiary
Tax Carryforwards
(Benefit from) provision for income taxes									(3,668,000)	(114,090,000)	$ 16,743,000
Deferred tax liabilities recognized in other liabilities, excluding current portion					$ 4,756,000					$ 4,756,000
Domestic and Foreign Tax Authority
Tax Carryforwards
Valuation allowance	168,500,000								168,500,000
Foreign Tax Authority
Tax Carryforwards
Operating loss carryforwards	942,000,000								942,000,000
Operating loss carryforwards, subject to expiration	7,600,000								7,600,000
Operating loss carryforwards, not subject to expiration	934,400,000								934,400,000
Deferred Tax Assets
Tax Carryforwards
Unrecognized tax benefits	7,600,000								7,600,000
Accrued Expenses
Tax Carryforwards
Unrecognized tax benefits	$ 11,900,000								$ 11,900,000