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DERIVATIVE AND HEDGING ACTIVITIES - (Details) $ in Thousands	1 Months Ended		2 Months Ended	3 Months Ended		12 Months Ended
	Apr. 30, 2020 USD ($) bbl	Oct. 31, 2019	Dec. 31, 2019 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019	Dec. 31, 2019 USD ($)
Derivative and hedging activities
Financial Designation, Predecessor and Successor [Fixed List]		Successor	Successor	Successor	Predecessor	Successor
Asset derivative contracts			$ 5,219	$ 109,119		$ 5,219
Liability derivative contracts			$ (12,923)	$ (4,445)		(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	$ 109,119		5,219
Liability derivative contracts			(12,923)	(4,445)		(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	71,353		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	37,766		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)	(3,972)		(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)	$ (473)		$ (4,854)
Subsequent event
Derivative and hedging activities
Volume of derivative terminated | bbl	217,000
Proceeds from termination of derivative contract	$ 4,800

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