SUPPLEMENTAL OIL AND GAS DISCLOSURES (Schedule Of Principal Sources Of Changes In Standardized Measure Of Discounted Future Net Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Supplemental Oil and Gas Disclosures [Abstract]
Sales and transfers of oil and natural gas produced, net of production costs	$ (161,238)	$ (84,163)
Net changes in prices and production costs	334,291	(165,978)
Revisions in quantity estimates and changes in production timing	320,774	(50,979)
Extensions, discoveries, and improved recovery, less related costs	45,019	2,827
Changes in estimated future development costs	0	0
Previously estimated cost incurred during the period	0	0
Purchases of minerals in place	0	852
Sales of minerals in place	(4,161)	(46)
Accretion of discount	19,306	46,203
Net change in income taxes	(87,078)	282
Other-net	(88,791)	(17,686)
Net change	378,123	(268,688)
Beginning of year	193,021	461,709
End of year	$ 571,144	$ 193,021