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Debt - 5.00% Convertible Senior Notes Due 2021 (Details) - USD ($)
$ in Thousands, shares in Millions
8 Months Ended 9 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Sep. 30, 2020
Debt Instrument [Line Items]      
Principal amount of long-term debt $ 634,737   $ 735,085
Unamortized discount and deferred financing costs 22,806   24,572
Long-term debt 611,931   $ 710,513
Gain (loss) on extinguishment of debt   $ 3,700  
5.00% Convertible Senior Notes due 2021      
Debt Instrument [Line Items]      
Debt instrument, interest rate     5.00%
5.00% Convertible Senior Notes due 2021 | Carrying Value      
Debt Instrument [Line Items]      
Long-term debt     $ 46,600
Convertible Debt | 5.00% Convertible Senior Notes due 2021      
Debt Instrument [Line Items]      
Debt instrument, interest rate   5.00% 5.00%
Principal amount of long-term debt 48,665   $ 48,665
Unamortized discount and deferred financing costs     $ 2,000
Repurchased face amount 66,300    
Repurchased amount in cash $ 18,600    
Repurchased amount, shares (in shares) 3.2    
Repurchase amount, fair value $ 74,300