Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Financial Instruments at Carrying and Fair Value (Details)

v3.21.2
Fair Value Measurements - Summary of Financial Instruments at Carrying and Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 21, 2021
Dec. 31, 2020
6.125% Senior Notes due 2024      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt instrument, interest rate, stated (as a percent) 6.125%    
9.00% Second Lien Senior Secured Notes due 2025      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt instrument, interest rate, stated (as a percent) 9.00%    
Unsecured debt | 6.25% Senior Notes due 2023      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt instrument, interest rate, stated (as a percent) 6.25% 6.25%  
Unsecured debt | 6.125% Senior Notes due 2024      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt instrument, interest rate, stated (as a percent) 6.125%    
Unsecured debt | 8.25% Senior Notes due 2025      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt instrument, interest rate, stated (as a percent) 8.25%    
Unsecured debt | 6.375% Senior Notes due 2026      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt instrument, interest rate, stated (as a percent) 6.375%    
Unsecured debt | 8.00% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt instrument, interest rate, stated (as a percent) 8.00% 8.00%  
Carrying Value | Level 2      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total $ 2,134,921   $ 2,027,641
Carrying Value | Level 2 | Unsecured debt | 6.25% Senior Notes due 2023      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 0   542,720
Carrying Value | Level 2 | Unsecured debt | 6.125% Senior Notes due 2024      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 460,241   460,241
Carrying Value | Level 2 | Unsecured debt | 9.00% Second Lien Senior Secured Notes due 2025      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 516,659   516,659
Carrying Value | Level 2 | Unsecured debt | 8.25% Senior Notes due 2025      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 187,238   187,238
Carrying Value | Level 2 | Unsecured debt | 6.375% Senior Notes due 2026      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 320,783   320,783
Carrying Value | Level 2 | Unsecured debt | 8.00% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 650,000   0
Fair Value | Level 2      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total 2,166,807   1,336,990
Fair Value | Level 2 | Unsecured debt | 6.25% Senior Notes due 2023      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 0   344,627
Fair Value | Level 2 | Unsecured debt | 6.125% Senior Notes due 2024      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 456,789   260,036
Fair Value | Level 2 | Unsecured debt | 9.00% Second Lien Senior Secured Notes due 2025      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 561,867   470,160
Fair Value | Level 2 | Unsecured debt | 8.25% Senior Notes due 2025      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 185,366   100,172
Fair Value | Level 2 | Unsecured debt | 6.375% Senior Notes due 2026      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 311,160   161,995
Fair Value | Level 2 | Unsecured debt | 8.00% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes $ 651,625   $ 0