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LONG-TERM DEBT - Second Lien Notes due 2023 (Details)
3 Months Ended
Jul. 01, 2018
May 15, 2018
USD ($)
Mar. 31, 2020
USD ($)
Jan. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Nov. 30, 2019
USD ($)
Oct. 21, 2019
USD ($)
Oct. 05, 2018
USD ($)
May 13, 2013
Line of Credit Facility [Line Items]                  
Long-term debt     $ 1,040,282,000   $ 1,118,161,000        
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     76,700,000 $ 76,700,000   $ 70,800,000      
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            
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%