INCOME TAXES (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Allowance for losses and nondeductible accruals	$ 15,662	$ 23,819
Net operating loss carryforward	81,199	94,441
Depreciation, depletion, amortization, and impairment	43,172	68,001
Alternative minimum tax and research and development tax credit carryforward	1,738	1,738
Deferred tax assets, total	141,771	187,999
Investment in Superior	(406)	(3,626)
Net deferred tax asset	141,365	184,373
Valuation allowance	(141,365)	(184,373)
Non-current-deferred tax liability	$ 0	$ 0