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Debt - 5.00% Convertible Senior Notes Due 2021 (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Principal amount of long-term debt $ 676,665 $ 731,523
Unamortized discount and deferred financing costs 20,664 22,930
Long-term debt $ 656,001 $ 708,593
5.00% Convertible Senior Notes due 2021    
Debt Instrument [Line Items]    
Debt instrument, interest rate 5.00% 5.00%
5.00% Convertible Senior Notes due 2021 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt $ 48,000  
Convertible Debt | 5.00% Convertible Senior Notes due 2021    
Debt Instrument [Line Items]    
Debt instrument, interest rate 5.00%  
Principal amount of long-term debt $ 48,665 $ 48,665
Unamortized discount and deferred financing costs $ 700