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Credit Facility and Other Long Term Debt - Senior Notes, Capped Call Transaction and Interest Expense (Details)
$ / shares in Units, shares in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2021
USD ($)
shares
May 31, 2021
USD ($)
shares
May 31, 2020
USD ($)
d
$ / shares
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Debt Instrument [Line Items]                  
Repayment of credit facility     $ 439,900,000            
Loss on conversion of notes         $ 58,526,000 $ 0      
Proceeds from option contract termination $ 38,600,000 $ 53,000,000              
Effective interest rate,percentage       6.80% 6.80%        
1.50% Convertible Senior Notes                  
Debt Instrument [Line Items]                  
Stated interest rate, percentage     1.50%            
Aggregate principal     $ 500,000,000 $ 80,900,000 $ 80,900,000        
Proceeds from debt offering     488,800,000            
Payment of cap call transaction     $ 47,900,000            
Convertible notes exchanged 169,100,000 250,000,000   169,000,000 419,000,000        
Repayments of convertible notes $ 207,000,000 $ 300,000,000              
Loss on conversion of notes       $ 23,800,000 $ 58,500,000        
Initial conversion rate     0.1018589            
Debt conversion price (in usd per share) | $ / shares     $ 9.82            
Trading days (whether or not consecutive) | d     20            
Consecutive trading days | d     30            
Percentage of stock price     130.00%            
Business period     5 days            
Measurement period     5 days            
Measurement period, percentage     98.00%            
Redemption price, percentage of principal repurchased     100.00%            
Cap call transaction cap price per share (in usd per share) | $ / shares     $ 13.4750            
Premium over last reported sale price, percentage     75.00%            
Deferred financing costs     $ 10,000,000            
1.50% Convertible Senior Notes | Additional Paid-in Capital                  
Debt Instrument [Line Items]                  
Deferred financing costs     2,200,000            
1.50% Convertible Senior Notes | Senior Notes                  
Debt Instrument [Line Items]                  
Deferred financing costs     $ 12,300,000            
1.50% Convertible Senior Notes | Class C Common Stock                  
Debt Instrument [Line Items]                  
Stock issued in exchange of convertible notes (shares) | shares 7.7 11.1              
3.25% Senior Notes | Senior Notes                  
Debt Instrument [Line Items]                  
Stated interest rate, percentage       3.25% 3.25%       3.25%
Aggregate principal                 $ 600,000,000
Deferred financing costs       $ 2,536,000 $ 2,536,000 $ 3,074,000 $ 2,940,000 $ 5,400,000