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OPERATING REVENUES - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	$ 64,103	$ 18,031	$ 119,369	$ 65,055
Other	263	463	515	838
Total operating revenues	64,366	18,494	119,884	65,893
Total oil, natural gas and natural gas liquids sales
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	64,103	18,031	119,369	65,055
Oil
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	51,935	15,758	93,205	57,675
Natural gas
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	5,317	836	14,404	1,190
NGLs
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	6,851	$ 1,437	11,760	$ 6,190
Accounts receivable
Disaggregation of operating revenue
Due from contracts with customers	$ 33,900		$ 33,900		$ 24,500

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