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OPERATING REVENUES - Revenue Recognition (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
Disaggregation of operating revenue
Financial Designation, Predecessor and Successor [Fixed List]	Successor	Successor	Successor	Predecessor	Successor	Predecessor
Total oil, natural gas and natural gas liquids sales			$ 39,446	$ 50,563	$ 104,501	$ 158,360
Other			384	246	1,222	743
Total operating revenues			39,830	50,809	105,723	159,103
Total oil, natural gas and natural gas liquids sales
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales			39,446	50,563	104,501	158,360
Oil
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales			33,638	46,275	91,313	145,024
Natural gas
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales			1,912	301	3,102	107
NGLs
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales			3,896	$ 3,987	10,086	$ 13,229
Accounts receivable
Disaggregation of operating revenue
Due from contracts with customers		$ 36,400	$ 20,400		$ 20,400

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