Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill
Beginning balance		$ 18,932,000	$ 81,752,000
Foreign currency translation impact		853,000	(1,524,000)
Disposition			(154,000)
Impairment charges	$ (128,938,000)	0	(61,142,000)	$ (80,337,000)
Ending balance		19,785,000	18,932,000	81,752,000
Rail Products and Services
Goodwill
Beginning balance		13,785,000	48,188,000
Foreign currency translation impact		853,000	(1,524,000)
Disposition			(154,000)
Impairment charges			(32,725,000)
Ending balance		14,638,000	13,785,000	48,188,000
Construction Products
Goodwill
Beginning balance		5,147,000	5,147,000
Foreign currency translation impact		0	0
Disposition			0
Impairment charges			0
Ending balance		5,147,000	5,147,000	5,147,000
Tubular and Energy Services
Goodwill
Beginning balance		0	28,417,000
Foreign currency translation impact		0	0
Disposition			0
Impairment charges			(28,417,000)
Ending balance		$ 0	$ 0	$ 28,417,000