PROPERTY AND EQUIPMENT (Narrative) (Details) - USD ($)	1 Months Ended	2 Months Ended	3 Months Ended	5 Months Ended	6 Months Ended
	Jun. 30, 2021	May 17, 2021	Jun. 30, 2020	May 17, 2021	Jun. 30, 2020
Property, Plant and Equipment [Abstract]
Impairment of oil and natural gas properties	$ 117,813,000	$ 0	$ 532,880,000	$ 0	$ 1,086,225,000
Capitalized general and administrative costs	$ 2,200,000	$ 2,500,000	$ 8,200,000	8,000,000.0	$ 13,600,000
Impairment of corporate headquarters				$ 14,600,000