Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT - Second Lien Notes due 2023 (Details)

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LONG-TERM DEBT - Second Lien Notes due 2023 (Details)
3 Months Ended 9 Months Ended
May 15, 2018
USD ($)
Sep. 30, 2020
USD ($)
shares
Jun. 30, 2020
USD ($)
shares
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Nov. 30, 2019
USD ($)
Oct. 31, 2018
USD ($)
Oct. 05, 2018
Line of Credit Facility [Line Items]                  
Long-term debt   $ 983,327,000   $ 983,327,000   $ 1,118,161,000      
Number of shares issued in transaction (in shares) | shares   4,200,000              
Revolving Credit Facility                  
Line of Credit Facility [Line Items]                  
Maximum debt to EBITDAX ratio under debt covenant                 3.50
Second Lien Notes due 2023                  
Line of Credit Facility [Line Items]                  
Second lien notes               $ 350,000,000.0  
Aggregate principal amount of debt repurchased and retired   $ 9,500,000 $ 30,200,000 9,500,000 $ 76,700,000   $ 70,800,000    
Number of shares issued in transaction (in shares) | shares   1,300,000 2,800,000            
Repayments of secured debt       13,500,000          
Second Lien Notes due 2023 | Revolving Credit Facility                  
Line of Credit Facility [Line Items]                  
Long-term debt             $ 200,000,000.0    
Second Lien Notes due 2023 | Exchange Agreement                  
Line of Credit Facility [Line Items]                  
Second lien notes $ 344,300,000 $ 4,300,000   $ 4,300,000          
Aggregate principal amount of debt repurchased and retired           $ 10,100,000      
Second Lien Notes due 2023 | Secured Debt                  
Line of Credit Facility [Line Items]                  
Interest rate 8.50%                
Maximum rate of increase in interest rate 3.00                
Percent of net cash proceeds of asset sales for debt prepayment 100.00%                
Threshold amount of casualty events and condemnations $ 20,000,000.0                
Redemption price, percentage of principal amount repurchased 101.00%                
Second Lien Notes due 2023 | Secured Debt | From and after May 15, 2018 until May 15, 2021                  
Line of Credit Facility [Line Items]                  
Redemption price percentage 104.00%                
Second Lien Notes due 2023 | Secured Debt | On and after May 15, 2021 until May 15, 2022                  
Line of Credit Facility [Line Items]                  
Redemption price percentage 102.00%                
Second Lien Notes due 2023 | Secured Debt | On and after May 15, 2022                  
Line of Credit Facility [Line Items]                  
Redemption price percentage 100.00%                
Second Lien Notes due 2023 | Secured Debt | Debt to EBITDAX Ratio below 2.50 to 1.00                  
Line of Credit Facility [Line Items]                  
Debt to EBITDAX ratio under debt covenant 2.50                
Second Lien Notes due 2023 | Secured Debt | Debt to EBITDAX Ratio between 2.50 to 1.00 and 2.75 to 1.00                  
Line of Credit Facility [Line Items]                  
Interest rate increase 1.00%                
Second Lien Notes due 2023 | Secured Debt | Debt to EBITDAX Ratio between 2.50 to 1.00 and 2.75 to 1.00 | Maximum                  
Line of Credit Facility [Line Items]                  
Maximum debt to EBITDAX ratio under debt covenant 2.75                
Second Lien Notes due 2023 | Secured Debt | Debt to EBITDAX Ratio between 2.50 to 1.00 and 2.75 to 1.00 | Minimum                  
Line of Credit Facility [Line Items]                  
Maximum debt to EBITDAX ratio under debt covenant 2.50                
Second Lien Notes due 2023 | Secured Debt | Debt to EBITDAX Ratio between 2.75 to 1.00 and 3.00 to 1.00                  
Line of Credit Facility [Line Items]                  
Interest rate increase 2.00%                
Second Lien Notes due 2023 | Secured Debt | Debt to EBITDAX Ratio between 2.75 to 1.00 and 3.00 to 1.00 | Maximum                  
Line of Credit Facility [Line Items]                  
Maximum debt to EBITDAX ratio under debt covenant 3.00                
Second Lien Notes due 2023 | Secured Debt | Debt to EBITDAX Ratio between 2.75 to 1.00 and 3.00 to 1.00 | Minimum                  
Line of Credit Facility [Line Items]                  
Maximum debt to EBITDAX ratio under debt covenant 2.75                
Second Lien Notes due 2023 | Secured Debt | Debt to EBITDAX Ratio Greater than or Equal to 3.00 to 1.00                  
Line of Credit Facility [Line Items]                  
Interest rate increase 3.00%                
8.000% Senior Notes due 2020 | Senior Unsecured Notes                  
Line of Credit Facility [Line Items]                  
Interest rate 8.00%