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) - USD ($)
Jul. 01, 2018
May 15, 2018
Mar. 31, 2019
Dec. 31, 2018
Oct. 05, 2018
May 13, 2013
Senior Second Lien Notes Due 2023            
Line of Credit Facility [Line Items]            
Second lien notes         $ 350,000,000.0  
Basis spread on variable rate   3.00%        
Senior Second Lien Notes Due 2023 | Secured Debt            
Line of Credit Facility [Line Items]            
Interest rate   8.50% 8.50%      
Interest rate increase 1.00%          
Debt to EBITDAX ratio under debt covenant   3.00        
Maximum rate of increase in interest rate   3.00        
Cash interest rate threshold (percent)   9.50%        
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%        
Senior 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%        
Senior 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%        
Senior Second Lien Notes Due 2023 | Secured Debt | On and after May 15, 2022            
Line of Credit Facility [Line Items]            
Redemption price percentage   100.00%        
Senior Second Lien Notes Due 2023 | Exchange Agreement            
Line of Credit Facility [Line Items]            
Second lien notes   $ 344,300,000 $ 1,700,000 $ 900,000    
8.000% Senior Notes Due 2020 | Senior Unsecured Notes            
Line of Credit Facility [Line Items]            
Interest rate           8.00%