Income Taxes (Schedule Of Total Provision For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current taxes, Federal	$ (918)	$ (1,835)	$ 0
Current taxes, State	(363)	(1,296)	5
Current taxes	(1,281)	(3,131)	5
Deferred taxes, Federal	(108,440)	(8,741)	(62,788)
Deferred taxes, State	(22,605)	(2,124)	5,105
Deferred taxes	(131,045)	(10,865)	(57,683)
Total provision	$ (132,326)	$ (13,996)	$ (57,678)