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OPERATING REVENUES - Revenue Recognition (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended		12 Months Ended
	Oct. 01, 2019	Dec. 31, 2019	Oct. 01, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of operating revenue
Financial Designation, Predecessor and Successor [Fixed List]	Predecessor	Successor	Predecessor	Predecessor	Successor	Successor	Predecessor
Total oil, natural gas and natural gas liquids sales		$ 65,115	$ 158,360		$ 146,775		$ 225,529
Other		467	743		1,514		1,080
Total operating revenues		65,582	159,103		148,289		226,609
Oil
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales		58,325	145,024		125,985		199,601
Oil
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales		58,325	145,024		125,985		199,601
Natural gas
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales		1,719	107		5,818		6,791
Natural gas
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales		1,719	107		5,818		6,791
NGLs
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales		5,071	$ 13,229		14,972		$ 19,137
Accounts receivable
Disaggregation of operating revenue
Due from contracts with customers		$ 36,400			$ 24,500	$ 36,400

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