Income Taxes (Schedule Of Roll Forward Of Valuation Allowance For Deferred Income Tax Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Abstract]
Valuation Allowance, Balance at beginning of year	$ 4,378	$ 22,348	$ 28,632
Charged to Costs and Expenses	51	(17,970)	(6,284)
Other Adjustments	(1,106)
Valuation Allowance, Balance at end of period	$ 3,323	$ 4,378	$ 22,348