Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT (Summary of Long-Term Debt) (Details)

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LONG-TERM DEBT (Summary of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total Debt $ 2,282,811 $ 2,258,962
Less: current maturities of long-term debt (279,807) (253,743)
Less: amounts reclassified to liabilities subject to compromise (2,003,004) (2,005,219)
Total Debt reflected as long term 0 0
6.625% senior unsecured notes due 2023 | Senior Notes    
Debt Instrument [Line Items]    
Long-term debt $ 324,583 324,583
Stated interest rate 6.625%  
6.000% senior unsecured notes due 2024 | Senior Notes    
Debt Instrument [Line Items]    
Long-term debt $ 579,568 579,568
Stated interest rate 6.00%  
6.375% senior unsecured notes due 2025 | Senior Notes    
Debt Instrument [Line Items]    
Long-term debt $ 507,870 507,870
Stated interest rate 6.375%  
6.375% senior unsecured notes due 2026 | Senior Notes    
Debt Instrument [Line Items]    
Long-term debt $ 374,617 374,617
Stated interest rate 6.375%  
Building loan    
Debt Instrument [Line Items]    
Long-term debt $ 21,914 21,914
Revolving Credit Agreement | DIP credit facility    
Debt Instrument [Line Items]    
Long-term debt 157,500 157,500
Revolving Credit Agreement | Pre-petition revolving credit facility    
Debt Instrument [Line Items]    
Long-term debt $ 316,759 $ 292,910