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Debt - 5.00% Convertible Senior Notes Due 2021 (Details) - USD ($)
shares in Millions
3 Months Ended 8 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2019
Dec. 21, 2017
Debt Instrument [Line Items]          
Principal amount of long-term debt $ 631,234,000   $ 634,737,000 $ 634,737,000  
Unamortized discount and deferred financing costs 21,345,000   22,806,000 22,806,000  
Long-term debt $ 609,889,000   611,931,000 611,931,000  
7.75% Senior Secured Notes due 2025          
Debt Instrument [Line Items]          
Debt instrument, interest rate 7.75%        
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 $ 45,400,000        
Senior Notes | 7.75% Senior Secured Notes due 2025          
Debt Instrument [Line Items]          
Debt instrument, interest rate 7.75%       7.75%
Principal amount of long-term debt $ 300,000,000   300,000,000 300,000,000 $ 300,000,000
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 $ 48,665,000   48,665,000 48,665,000  
Unamortized discount and deferred financing costs 3,300,000        
Repurchased face amount     66,300,000 66,300,000  
Repurchased amount in cash     $ 18,600,000    
Repurchased amount, shares (in shares)     3.2    
Repurchase amount, fair value     $ 74,300,000    
Gain (loss) on extinguishment of debt $ 0 $ 0   $ (6,100,000)