ASSET RETIREMENT OBLIGATIONS (Schedule Of Asset Retirement Obligations) (Details) - USD ($) $ in Thousands		4 Months Ended	8 Months Ended		12 Months Ended
	Sep. 01, 2020	Dec. 31, 2020	Aug. 31, 2020		Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract]
ARO liability, Beginning Balance:	$ 38,984	$ 38,984	$ 66,627		$ 23,356
Accretion of discount		467	1,545		1,892
Liability incurred		151	465		7
Liability settled		(95)	(838)		(1,140)
Liability sold			(487)		(1,935)
Revision of estimates		(1,758)	(28,328)	[1]	3,507
Fresh start adjustments	(14,393)
ARO liability, Ending Balance:	$ 24,591	23,356	$ 38,984		25,688
Less current portion		2,121			2,537
Total long-term ARO liability		$ 21,235			$ 23,151

[1] Plugging liability estimates were revised for updates in the cost of services used to plug wells over the preceding year and estimated dates to be plugged.