Other Operating Expenses/(Income) (Schedule Of Other Operating Expenses/(Income)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Total other operating expenses	$ (41,384)	$ 2,570	$ (41,142)	$ 8,923
CARES Act Grant [Member]
Total other operating expenses	(40,989)		(40,989)
(Gain)/Loss On Disposal Of Fixed Assets [Member]
Total other operating expenses	$ (395)	304	$ (153)	657
Transportation Equipment Held For Sale [Member]
Total other operating expenses		$ 2,266		2,266
Litigation Settlement [Member]
Total other operating expenses				$ 6,000