Other Operating Expenses/(Income)s (Schedule Of Other Operating Expenses/(Income)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total other operating expenses/(income)	$ 987	$ (75,095)	$ 9,132
Loss On Disposal Of Fixed Assets [Member]
Total other operating expenses/(income)	$ 987	541	866
CARES Act Grant [Member]
Total other operating expenses/(income)		(80,225)
Litigation Settlements [Member]
Total other operating expenses/(income)		$ 4,589	6,000
Loss On Sale Of Transportation Equipment [Member]
Total other operating expenses/(income)			$ 2,266