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DERIVATIVE AND HEDGING ACTIVITIES - (Details) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Oct. 31, 2019	Dec. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Derivative and hedging activities
Financial Designation, Predecessor and Successor [Fixed List]	Successor	Successor	Successor	Predecessor	Successor	Predecessor	Successor
Asset derivative contracts		$ 5,219	$ 51,551		$ 51,551		$ 5,219
Liability derivative contracts		$ (12,923)	(14,097)		$ (14,097)		(12,923)
Derivatives not designated as hedging contracts under ASC 815
Derivative and hedging activities
Financial Designation, Predecessor and Successor [Fixed List]	Successor	Successor			Successor
Asset derivative contracts		$ 5,219	51,551		$ 51,551		5,219
Liability derivative contracts		(12,923)	(14,097)		(14,097)		(12,923)
Derivatives not designated as hedging contracts under ASC 815 | Commodity contracts | Current assets - receivables from derivative contracts
Derivative and hedging activities
Asset derivative contracts		4,995	27,229		27,229		4,995
Derivatives not designated as hedging contracts under ASC 815 | Commodity contracts | Other noncurrent assets - receivables from derivative contracts
Derivative and hedging activities
Asset derivative contracts		224	24,322		24,322		224
Derivatives not designated as hedging contracts under ASC 815 | Commodity contracts | Current liabilities - liabilities from derivative contracts
Derivative and hedging activities
Liability derivative contracts		(8,069)	(8,466)		(8,466)		(8,069)
Derivatives not designated as hedging contracts under ASC 815 | Commodity contracts | Other noncurrent liabilities - liabilities from derivative contracts
Derivative and hedging activities
Liability derivative contracts		$ (4,854)	$ (5,631)		$ (5,631)		$ (4,854)

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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