Income Taxes (Schedule Of Total Provision For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Current taxes, Federal	$ (1,835)	$ 0	$ 0
Current taxes, State	(1,296)	5	15
Current taxes	(3,131)	5	15
Deferred taxes, Federal	(8,741)	(62,788)	(62,923)
Deferred taxes, State	(2,124)	5,105	(8,286)
Deferred taxes	(10,865)	(57,683)	(71,209)
Total provision	$ (13,996)	$ (57,678)	$ (71,194)