Discontinued Operations (Summary Of Components Of Loss From Discontinued Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net loss from discontinued operations	$ (16,582)	$ (1,221)	$ (17,246)	$ (2,753)
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Logistics revenue	22,648	29,802	52,754	57,518
Logistics transportation costs	19,533	26,091	46,348	50,610
Administrative expenses	4,107	5,319	8,269	10,541
Loss on classification as held for sale	18,477		18,477
Total operating expenses	42,117	31,410	73,094	61,151
Operating loss	(19,469)	(1,608)	(20,340)	(3,633)
Interest income	(3)	(4)	(6)	(8)
Loss before income taxes	(19,466)	(1,604)	(20,334)	(3,625)
Income tax benefit	(2,884)	(383)	(3,088)	(872)
Net loss from discontinued operations	$ (16,582)	$ (1,221)	$ (17,246)	$ (2,753)