SUPPLEMENTAL OIL AND GAS INFORMATION (UNAUDITED) - Narrative (Details) - Oil Revenues Boe in Thousands	12 Months Ended
	Dec. 31, 2021 MMBoe Boe	Dec. 31, 2021 MMBoe Boe	Dec. 31, 2020 Boe MMBoe	Dec. 31, 2020 MMBoe Boe	Dec. 31, 2019 Boe MMBoe	Dec. 31, 2019 MMBoe Boe	Dec. 31, 2018 Boe
Reserve Quantities [Line Items]
Extension and discoveries attributable to successful drilling | Boe	18,164		8,306		23,662
Proved Developed Reserves | Boe	170,598	170,598	84,145	84,145	96,634	96,634	76,216
Purchase of mineral in place	131,753	131.8			34,606	34.6
Increase (decrease) to proved reserves	34,766	34.8	(36,874)	(36.9)	(16,355)	(16.4)
Upward (downward) adjustment attributable to lower crude oil and natural gas prices		50.2		(33.8)		(9.8)
Downward adjustment due to well performance		1.1		0.7		2.0
Downward adjustment attributable to removal of undeveloped drilling locations		(14.2)		(2.3)		(4.6)
Williston Basin
Reserve Quantities [Line Items]
Extension and discoveries attributable to successful drilling		18.2		8.3		23.7
Proved Developed Reserves	4.9	4.9	3.1	3.1	11.3	11.3
Additional Locations
Reserve Quantities [Line Items]
Proved Developed Reserves	13.3	13.3	5.2	5.2	12.3	12.3