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BASIS OF PRESENTATION - DISAGGREGATED REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Oil and gas sales	$ 156,035	$ 36,192	$ 230,194	$ 96,597
Crude oil sales
Disaggregation of Revenue [Line Items]
Oil and gas sales	116,091	28,934	166,155	80,080
Natural gas sales
Disaggregation of Revenue [Line Items]
Oil and gas sales	15,168	4,712	28,300	10,730
Natural gas liquids sales
Disaggregation of Revenue [Line Items]
Oil and gas sales	$ 24,776	$ 2,546	$ 35,739	$ 5,787

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