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OPERATING REVENUES - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	$ 55,266	$ 47,024
Other	252	375
Total operating revenues	55,518	47,399
Total oil, natural gas and natural gas liquids sales
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	55,266	47,024
Oil
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	41,270	41,917
Natural gas
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	9,087	354
NGLs
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	4,909	$ 4,753
Accounts receivable
Disaggregation of operating revenue
Due from contracts with customers	$ 34,100		$ 24,500

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