Income Taxes (Schedule Of Total Provision For Income Taxes) (Details) - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2020	Aug. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Current taxes, Federal	$ 0	$ (917)	$ (918)
Current taxes, State	(302)	0	(363)
Current taxes	(302)	(917)	(1,281)
Deferred taxes, Federal	0	(16,663)	(108,440)
Deferred taxes, State	0	2,950	(22,605)
Deferred taxes	0	(13,713)	(131,045)
Total provision	$ (302)	$ (14,630)	$ (132,326)