Other Operating Expenses/(Income) (Schedule Of Other Operating Expenses/(Income)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Total other operating expenses/(income)	$ 63	$ 12,207	$ 789	$ (28,935)
Loss On Disposal Of Fixed Assets [Member]
Total other operating expenses/(income)	$ 63	307	$ 789	154
CARES Act Grant [Member]
Total other operating expenses/(income)		8,805		(32,184)
Litigation Settlements [Member]
Total other operating expenses/(income)		$ 3,095		$ 3,095