Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tax Carryforwards [Line Items]
Effective tax rate		13.00%	16.00%
Deferred tax benefit	$ 209,000	$ (277,341)	$ (167,387)	$ 1,512,252
Valuation allowance		213,750	205,192
Unrecognized tax benefits		86,648	33,920	19,549	$ 3,814
Net unrecognized tax benefits which would affect the tax rate if recognized		75,800	$ 33,900	$ 19,500
Deferred Tax Assets
Tax Carryforwards [Line Items]
Unrecognized tax benefits		48,100
Accounts Payable and Accrued Liabilities
Tax Carryforwards [Line Items]
Unrecognized tax benefits		38,500
Domestic and Foreign Tax Authority
Tax Carryforwards [Line Items]
Valuation allowance		213,800
Domestic Tax Authority
Tax Carryforwards [Line Items]
Operating loss carryforwards		97,400
Tax credit carryforwards		249,200
Operating loss carryforwards, subject to expiration		29,100
State and Local Jurisdiction
Tax Carryforwards [Line Items]
Operating loss carryforwards		708,200
Tax credit carryforwards		179,100
Foreign Tax Authority
Tax Carryforwards [Line Items]
Operating loss carryforwards		521,600
Operating loss carryforwards, subject to expiration		10,600
Operating loss carryforwards, not subject to expiration		$ 511,000