Other Operating Expenses/(Income) (Schedule Of Other Operating Expenses/(Income)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Total other operating expenses	$ 78	$ 257	$ 9,001	$ 88
Litigation Settlement [Member]
Total other operating expenses			6,000	(204)
Transportation Equipment Sold [Member]
Total other operating expenses			2,266
Loss On Disposal Of Fixed Assets [Member]
Total other operating expenses	$ 78	$ 257	$ 735	$ 292