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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Before Tax Effect of Derivative Instruments in Statement of Operations (Details) - Predecessor - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Increase in oil revenue owing to effective hedging contracts $ 23,747 $ 135,617
Increase (decrease) in gas revenue owing to effective hedging contracts 11,710 14,338
Designated as Hedging Instrument | Cash Flow Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives (1,648) 52,630
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion) 35,457 149,955
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) (810) 2,713
Designated as Hedging Instrument | Cash Flow Hedging | Operating revenue - oil/natural gas production    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion) 35,457 149,955
Designated as Hedging Instrument | Cash Flow Hedging | Derivative income (expense), net    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) (810) 2,713
Designated as Hedging Instrument | Cash Flow Hedging | Commodity contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives $ (1,648) $ 52,630