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Debt - Carrying Value of Exchangeable Notes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Apr. 17, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Principal $ 4,781,437   $ 3,282,195
Net carrying value 4,666,000   3,343,000
Debt issuance costs 52,000   $ 15,000
Convertible Debt | 4.00% senior exchangeable notes due 2025      
Debt Instrument [Line Items]      
Principal 345,000    
Less: Unamortized debt discount (80,446)    
Net carrying value 264,554 $ 255,000  
Conversion feature 90,500    
Less: Equity portion of debt issuance costs 3,167    
Less: Deferred tax liability (19,457) $ (20,000)  
Net carrying value 67,876    
Debt issuance costs $ 8,000