Other Operating Expenses/(Income) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Operating Expenses [Line Items]
Total other operating expenses/(income)	$ 2,570	$ (118)	$ 8,923	$ (169)
Transportation Equipment Held For Sale [Member]
Other Operating Expenses [Line Items]
Total other operating expenses/(income)	$ 2,266		2,266
Litigation Settlement [Member]
Other Operating Expenses [Line Items]
Total other operating expenses/(income)		$ (204)	$ 6,000	$ (204)