Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT (Narrative) (Details)

v3.21.1
LONG-TERM DEBT (Narrative) (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
day
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Oct. 08, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]          
Debtor-in-possession financing, letters of credit outstanding $ 262,500,000        
Debtor-in-possession financing, amount arranged 105,000,000        
Debtor-in-possession financing, borrowings outstanding $ 157,500,000        
Debtor-in-possession financing, number of business days after petition date to terminate | day 3        
Debtor-in-possession financing, number of dates after the entry of the interim order to terminate | day 35        
Interest capitalized $ 0 $ 187,000      
Oil and Gas Properties          
Debt Instrument [Line Items]          
Interest capitalized 0 $ 200,000      
Senior Notes | Carry Value          
Debt Instrument [Line Items]          
Carrying value of notes 1,800,000,000        
Senior Notes | Fair Value | Level 1          
Debt Instrument [Line Items]          
Carrying value of notes $ 1,600,000,000        
DIP credit facility | Revolving Credit Agreement          
Debt Instrument [Line Items]          
Weight average interest rate 5.50%        
DIP credit facility | Revolving Credit Agreement | Eurodollar          
Debt Instrument [Line Items]          
Variable interest rate 4.50%        
DIP credit facility | Revolving Credit Agreement | Base Rate          
Debt Instrument [Line Items]          
Variable interest rate 3.50%        
Revolving Credit Agreement | DIP credit facility          
Debt Instrument [Line Items]          
Long-term debt $ 157,500,000   $ 157,500,000    
Remaining borrowing capacity 76,500,000        
Revolving Credit Agreement | Pre-petition revolving credit facility          
Debt Instrument [Line Items]          
Long-term debt 316,759,000   $ 292,910,000    
Revolving Credit Agreement | Pre-petition revolving credit facility | Nova Scotia, Amegy, KeyBank          
Debt Instrument [Line Items]          
Long-term debt 316,800,000        
Remaining borrowing capacity 0        
Letter of Credit | DIP credit facility          
Debt Instrument [Line Items]          
Credit facility outstanding $ 28,500,000        
Letter of Credit | DIP credit facility | Revolving Credit Agreement          
Debt Instrument [Line Items]          
Commitment fee percentage 0.20%        
Letter of Credit | Pre-petition revolving credit facility | Nova Scotia, Amegy, KeyBank          
Debt Instrument [Line Items]          
Credit facility outstanding $ 121,200,000        
Proceeds from line of credit 26,100,000        
Letter of Credit | Pre-petition revolving credit facility | Nova Scotia, Amegy, KeyBank | Prepaid Expenses and Other Current Assets          
Debt Instrument [Line Items]          
Credit facility outstanding $ 99,100,000        
Revolving Credit Facility | DIP credit facility | Revolving Credit Agreement          
Debt Instrument [Line Items]          
Commitment fee percentage 0.50%        
Revolving Credit Facility | Pre-petition revolving credit facility          
Debt Instrument [Line Items]          
Elected commitment amount       $ 580,000,000 $ 700,000,000
Repayments of lines of credit $ 2,200,000        
Revolving Credit Facility | Pre-petition revolving credit facility | Revolving Credit Agreement | Nova Scotia, Amegy, KeyBank          
Debt Instrument [Line Items]          
Weight average interest rate 3.12%