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DERIVATIVE AND HEDGING ACTIVITIES - (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
Asset derivative contracts		$ 5,219	$ 28,671		$ 28,671
Liability derivative contracts		$ (12,923)	(12,347)		$ (12,347)
Derivatives not designated as hedging contracts
Derivative and hedging activities
Financial Designation, Predecessor and Successor [Fixed List]	Successor	Successor			Successor
Asset derivative contracts		$ 5,219	28,671		$ 28,671
Liability derivative contracts		(12,923)	(12,347)		(12,347)
Derivatives not designated as hedging contracts | Commodity contracts | Current assets - receivables from derivative contracts
Derivative and hedging activities
Asset derivative contracts		4,995	18,996		18,996
Derivatives not designated as hedging contracts | Commodity contracts | Other noncurrent assets - receivables from derivative contracts
Derivative and hedging activities
Asset derivative contracts		224	9,675		9,675
Derivatives not designated as hedging contracts | Commodity contracts | Current liabilities - liabilities from derivative contracts
Derivative and hedging activities
Liability derivative contracts		(8,069)	(9,055)		(9,055)
Derivatives not designated as hedging contracts | Commodity contracts | Other noncurrent liabilities - liabilities from derivative contracts
Derivative and hedging activities
Liability derivative contracts		$ (4,854)	$ (3,292)		$ (3,292)

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