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LONG TERM DEBT - Second Lien Notes due 2023 (Details) - USD ($)
Jul. 01, 2018
May 15, 2018
Dec. 31, 2019
Nov. 30, 2019
Oct. 05, 2018
Jan. 31, 2018
Second Lien Notes due 2023            
Line of Credit Facility [Line Items]            
Junior subordinated notes         $ 350,000,000.0  
Second Lien Notes due 2023 | Second Lien Notes            
Line of Credit Facility [Line Items]            
Interest rate percentage   8.50%        
Covenant compliance, percent of net cash proceeds of asset sales for debt prepayment   1        
Covenant compliance, threshold amount of casualty events and condemnations   $ 20,000,000.0        
Redemption price, percentage of principal amount redeemed   101.00%        
Second Lien Notes due 2023 | Second Lien Notes | Debt to EBITDAX Ratio below 2.50 to 1.00            
Line of Credit Facility [Line Items]            
Debt To EBITDAX ratio   2.50        
Second Lien Notes due 2023 | Second Lien Notes | Debt to EBITDAX Ratio between 2.50 to 1.00 and 2.75 to 1.00            
Line of Credit Facility [Line Items]            
Increase in interest rate 1.00%          
Second Lien Notes due 2023 | Second Lien Notes | Debt to EBITDAX Ratio between 2.75 to 1.00 and 3.00 to 1.00            
Line of Credit Facility [Line Items]            
Increase in interest rate 2.00%          
Second Lien Notes due 2023 | Second Lien Notes | Debt to EBITDAX Ratio Greater than or Equal to 3.00 to 1.00            
Line of Credit Facility [Line Items]            
Increase in interest rate 3.00%          
Covenant compliance, debt to EBITDAX ratio   3.00        
Second Lien Notes due 2023 | Second Lien Notes | Minimum | Debt to EBITDAX Ratio between 2.50 to 1.00 and 2.75 to 1.00            
Line of Credit Facility [Line Items]            
Covenant compliance, debt to EBITDAX ratio   2.50        
Second Lien Notes due 2023 | Second Lien Notes | Minimum | Debt to EBITDAX Ratio between 2.75 to 1.00 and 3.00 to 1.00            
Line of Credit Facility [Line Items]            
Covenant compliance, debt to EBITDAX ratio   2.75        
Second Lien Notes due 2023 | Second Lien Notes | Maximum | Debt to EBITDAX Ratio between 2.50 to 1.00 and 2.75 to 1.00            
Line of Credit Facility [Line Items]            
Covenant compliance, debt to EBITDAX ratio   2.75        
Second Lien Notes due 2023 | Second Lien Notes | Maximum | Debt to EBITDAX Ratio between 2.75 to 1.00 and 3.00 to 1.00            
Line of Credit Facility [Line Items]            
Covenant compliance, debt to EBITDAX ratio   3.00        
Second Lien Notes due 2023 | Second Lien Notes | Period One            
Line of Credit Facility [Line Items]            
Redemption price, percentage   104.00%        
Second Lien Notes due 2023 | Second Lien Notes | Period Two            
Line of Credit Facility [Line Items]            
Redemption price, percentage   102.00%        
Second Lien Notes due 2023 | Second Lien Notes | Period Three            
Line of Credit Facility [Line Items]            
Redemption price, percentage   100.00%        
Second Lien Notes due 2023 | Exchange Agreement            
Line of Credit Facility [Line Items]            
Junior subordinated notes   $ 344,300,000 $ 4,300,000      
Principal repaid       $ 10,100,000    
8% Senior Notes due 2020 | Senior Notes            
Line of Credit Facility [Line Items]            
Interest rate percentage           8.00%