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OPERATING REVENUES - Revenue Recognition (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
Disaggregation of operating revenue
Financial Designation, Predecessor and Successor [Fixed List]	Successor	Successor	Successor	Predecessor	Successor	Predecessor	Successor
Total oil, natural gas and natural gas liquids sales			$ 18,031	$ 55,874	$ 65,055	$ 107,797
Other			463	504	838	497
Total operating revenues			18,494	56,378	65,893	108,294
Total oil, natural gas and natural gas liquids sales
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales			18,031	55,874	65,055	107,797
Oil
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales			15,758	53,232	57,675	98,749
Natural gas
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales			836	(1,655)	1,190	(194)
Natural gas liquids
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales			1,437	$ 4,297	6,190	$ 9,242
Accounts receivable
Disaggregation of operating revenue
Due from contracts with customers		$ 36,400	$ 18,400		$ 18,400		$ 36,400

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