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DERIVATIVE AND HEDGING ACTIVITIES - Realized Unrealized (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2019
Dec. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivative and hedging activities            
Financial Designation, Predecessor and Successor [Fixed List] Successor Successor Successor Predecessor Successor Predecessor
Total net gain (loss) on derivative contracts     $ (15,843) $ 13,457 $ 67,695 $ (34,332)
Derivatives not designated as hedging contracts            
Derivative and hedging activities            
Financial Designation, Predecessor and Successor [Fixed List] Successor Successor     Successor  
Derivatives not designated as hedging contracts | Commodity contracts            
Derivative and hedging activities            
Total net gain (loss) on derivative contracts     (15,843) 13,457 $ 67,695 (34,332)
Derivatives not designated as hedging contracts | Commodity contracts | Other Income Expense            
Derivative and hedging activities            
Unrealized gain (loss) on commodity contracts     (21,128) 11,571 24,029 (45,834)
Realized gain (loss) on commodity contracts     $ 5,285 $ 1,886 $ 43,666 $ 11,502