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Debt - 2014 Convertible Notes and Credit Facility (Details) - USD ($)
12 Months Ended
Jul. 23, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
May 31, 2019
Jul. 31, 2018
Debt Instrument [Line Items]                
Interest Expense   $ 26,500,000 $ 15,300,000 $ 2,500,000        
Convertible debt | 2014 Notes                
Debt Instrument [Line Items]                
Funds drawn at closing           $ 0    
Principal amount       125,000,000.0        
Revolving Credit Facility                
Debt Instrument [Line Items]                
Fee amount         $ 6,500,000      
Funds drawn at closing           0    
Revolving Credit Facility | Delayed Draw Term Loan                
Debt Instrument [Line Items]                
Maximum borrowing capacity           $ 200,000,000 $ 100,000,000 $ 100,000,000
Common Stock | 2014 Notes                
Debt Instrument [Line Items]                
Conversion of stock (in shares) 5,040,323              
Additional shares converted (in shares) 329,124              
Induced conversion of convertible debt expense       $ 24,100,000