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
Jun. 30, 2019
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%      
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 $ 4,300,000    
Aggregate principal amount of debt repurchased and retired     $ 10,100,000    
8.000% Senior Notes Due 2020 | Senior Unsecured Notes          
Line of Credit Facility [Line Items]          
Interest rate         8.00%