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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)
3 Months Ended 9 Months Ended
May 22, 2020
Mar. 15, 2019
Nov. 30, 2017
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Oct. 08, 2020
May 01, 2020
Dec. 31, 2019
Debt Instrument [Line Items]                    
Total long-term debt, net       $ 1,092,241,000   $ 1,092,241,000       $ 1,057,389,000
Gain on exchange of debt $ 143,400,000     0 $ 0 143,443,000 $ 0      
Senior Notes                    
Debt Instrument [Line Items]                    
Unamortized debt issuance costs on Senior Notes       (13,298,000)   (13,298,000)       (14,061,000)
Unamortized debt discount       (22,333,000)   (22,333,000)       (3,550,000)
Total long-term debt, net       737,241,000   737,241,000       882,389,000
Senior Notes | Senior Secured Note Due 2025 [Member]                    
Debt Instrument [Line Items]                    
Percentage of principal amount, change in control 101.00%                  
Debt Instrument, Face Amount $ 127,100,000     $ 127,073,000   $ 127,073,000       $ 0
Unamortized debt discount $ (21,000,000.0)                  
Interest rate, stated percentage 8.00%     8.00%   8.00%       8.00%
Senior Notes | Senior Notes Due 2026                    
Debt Instrument [Line Items]                    
Percentage of principal amount, change in control     101.00%              
Debt Instrument, Face Amount     $ 400,000,000.0 $ 289,448,000   $ 289,448,000       $ 400,000,000
Interest rate, stated percentage     5.375% 5.375%   5.375%       5.375%
Senior Notes | Senior Notes Due 2027                    
Debt Instrument [Line Items]                    
Percentage of principal amount, change in control   101.00%                
Debt Instrument, Face Amount   $ 500,000,000.0   $ 356,351,000   $ 356,351,000       $ 500,000,000
Unamortized debt discount   $ (3,800,000)                
Interest rate, stated percentage   6.875%   6.875%   6.875%       6.875%
Revolving Credit Facility | Line of Credit                    
Debt Instrument [Line Items]                    
Line of Credit Facility, Current Borrowing Capacity                 $ 700,000,000.0  
Long-term Debt, Gross       $ 355,000,000   $ 355,000,000       $ 175,000,000
Debt Instrument, Face Amount       $ 355,000,000   $ 355,000,000       $ 175,000,000
Subsequent Event [Member] | Revolving Credit Facility | Line of Credit                    
Debt Instrument [Line Items]                    
Line of Credit Facility, Current Borrowing Capacity               $ 700,000,000.0