Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Summary of Long-Term Debt (Details)

v3.20.4
Long-Term Debt - Summary of Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Net unamortized debt issuance costs $ 0 $ (23,751)
Total Debt, net 2,258,962 1,978,651
Less: current maturities of long term debt (253,743) (631)
Less: amounts reclassified to liabilities subject to compromise (2,005,219) 0
Total Debt reflected as long term 0 1,978,020
Building Loan    
Debt Instrument [Line Items]    
Long-term debt 21,914 22,453
Senior notes | 6.625% senior unsecured notes due 2023    
Debt Instrument [Line Items]    
Long-term debt $ 324,583 329,467
Stated interest rate 6.625%  
Senior notes | 6.000% senior unsecured notes due 2024    
Debt Instrument [Line Items]    
Long-term debt $ 579,568 603,428
Stated interest rate 6.00%  
Senior notes | 6.375% senior unsecured notes due 2025    
Debt Instrument [Line Items]    
Long-term debt $ 507,870 529,525
Stated interest rate 6.375%  
Senior notes | 6.375% senior unsecured notes due 2026    
Debt Instrument [Line Items]    
Long-term debt $ 374,617 397,529
Stated interest rate 6.375%  
Line of Credit | DIP credit facility    
Debt Instrument [Line Items]    
Long-term debt $ 157,500 0
Line of Credit | Pre-petition revolving credit facility    
Debt Instrument [Line Items]    
Long-term debt $ 292,910 $ 120,000