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OPERATING REVENUES - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	$ 80,504	$ 39,446	$ 199,873	$ 104,501
Other	312	384	827	1,222
Total operating revenues	80,816	39,830	200,700	105,723
Total oil, natural gas and natural gas liquids sales
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	80,504	39,446	199,873	104,501
Oil
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	60,023	33,638	153,228	91,313
Natural gas
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	9,435	1,912	23,839	3,102
NGLs
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	11,046	$ 3,896	22,806	$ 10,086
Accounts receivable
Disaggregation of operating revenue
Due from contracts with customers	$ 38,600		$ 38,600		$ 24,500

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