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Fair Value Measurements (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
May 10, 2018
Sep. 25, 2017
Liabilities, Fair Value Disclosure [Abstract]        
Warrant liability $ 103,474,000 $ 383,073,000    
Fair Value, Recurring [Member]        
Assets, Fair Value Disclosure [Abstract]        
Cash equivalents - money market 20,389,000 1,129,000    
Derivative Asset   111,000    
Total Assets 20,389,000 1,240,000    
Liabilities, Fair Value Disclosure [Abstract]        
Interest rate swap   (8,237,000)    
Warrant liability (103,474,000) (383,073,000)    
Total Liabilities (116,888,000) (391,310,000)    
Carrying value, debt 1,479,100,000 1,484,400,000    
Fair Value, Recurring [Member] | Level 1 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Cash equivalents - money market 0 0    
Derivative Asset   0    
Total Assets 0 0    
Liabilities, Fair Value Disclosure [Abstract]        
Interest rate swap 0 0    
Warrant liability 0 0    
Total Liabilities 0 0    
Fair Value, Recurring [Member] | Level 2 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Cash equivalents - money market 20,389,000 1,129,000    
Derivative Asset   111,000    
Convertible note hedge fair value     $ 50,600,000 $ 56,100,000
Total Assets 20,389,000 1,240,000    
Liabilities, Fair Value Disclosure [Abstract]        
Interest rate swap (13,414,000) (8,237,000)    
Note conversion obligation fair value     $ 51,300,000 $ 57,400,000
Warrant liability (9,058,000) (340,767,000)    
Total Liabilities (22,472,000) (349,004,000)    
Difference between fair value and carrying value, debt 70,800,000 (2,700,000)    
Fair Value, Recurring [Member] | Level 3 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Cash equivalents - money market 0 0    
Derivative Asset   0    
Total Assets 0 0    
Liabilities, Fair Value Disclosure [Abstract]        
Interest rate swap 0 0    
Warrant liability (94,416,000) (42,306,000)    
Total Liabilities (94,416,000) (42,306,000)    
Fair Value, Recurring [Member] | Total [Member]        
Liabilities, Fair Value Disclosure [Abstract]        
Interest rate swap (13,414,000)      
Amazon Warrant AB [Member]        
Liabilities, Fair Value Disclosure [Abstract]        
Fair value warrants issued   $ 13.93    
Amazon Warrant AB [Member] | Measurement Input, Risk Free Interest Rate [Member]        
Liabilities, Fair Value Disclosure [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   1.60%    
Amazon Warrant AB [Member] | Measurement Input, Price Volatility [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   35.00%    
Amazon Warrant C [Member] [Member]        
Liabilities, Fair Value Disclosure [Abstract]        
Warrant liability (103,500,000) $ (383,100,000)    
Fair value warrants issued $ 15.49 $ 9.30    
Amazon Warrant C [Member] [Member] | Measurement Input, Risk Free Interest Rate [Member]        
Liabilities, Fair Value Disclosure [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 0.36% 1.80%    
Amazon Warrant C [Member] [Member] | Measurement Input, Price Volatility [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 40.00% 35.00%