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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets:    
Cash equivalents $ 980,580 $ 1,086,402
Restricted cash 4,352 6,388
Fair Value, Measurements, Recurring    
Assets:    
Cash equivalents 980,580 1,086,402
Restricted cash 4,352 6,388
Liabilities:    
Derivative Liability 16,908 3,847
Fair Value, Measurements, Recurring | Quoted Market Prices in Active Markets (Level 1)    
Assets:    
Cash equivalents 504,980 0
Restricted cash 2,054 2,048
Liabilities:    
Derivative Liability 0 0
Fair Value, Measurements, Recurring | Other Observable Inputs (Level 2)    
Assets:    
Cash equivalents 475,600 1,086,402
Restricted cash 2,298 4,340
Liabilities:    
Derivative Liability 16,908 3,847
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets:    
Cash equivalents 0 0
Restricted cash 0 0
Liabilities:    
Derivative Liability $ 0 $ 0