Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND LIQUIDITY, MANAGEMENT'S PLANS AND GOING CONCERN (Narrative) (Details)

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BASIS OF PRESENTATION, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND LIQUIDITY, MANAGEMENT'S PLANS AND GOING CONCERN (Narrative) (Details) - USD ($)
9 Months Ended
Nov. 02, 2020
Oct. 15, 2020
Sep. 30, 2020
Oct. 08, 2020
Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Percentage decrease in capital spending (more than)     50.00%    
Unsecured notes repurchased         $ 200,000,000
Long-term debt     $ 2,100,000,000    
Revolving Credit Agreement | Revolving Credit Agreement          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Borrowing base     700,000,000    
Unsecured Debt          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Unsecured notes repurchased     $ 73,300,000    
Senior Notes | 6.000% senior unsecured notes due 2024          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Stated interest rate, percent     6.00%    
Senior Notes | 6.625% senior unsecured notes due 2023          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Stated interest rate, percent     6.625%    
Subsequent Event | Revolving Credit Agreement | Revolving Credit Agreement          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Borrowing base       $ 580,000,000  
Subsequent Event | Senior Notes | 6.000% senior unsecured notes due 2024          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Debt instrument, interest   $ 17,400,000      
Stated interest rate, percent   6.00%      
Subsequent Event | Senior Notes | 6.625% senior unsecured notes due 2023          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Debt instrument, interest $ 10,800,000        
Stated interest rate, percent 6.625%