Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 18,932
Foreign currency translation impact	499
Goodwill, ending balance	19,431
Rail Products and Services
Goodwill [Roll Forward]
Goodwill, beginning balance	13,785
Foreign currency translation impact	499
Goodwill, ending balance	14,284
Construction Products
Goodwill [Roll Forward]
Goodwill, beginning balance	5,147
Foreign currency translation impact	0
Goodwill, ending balance	5,147
Tubular and Energy Services
Goodwill [Roll Forward]
Goodwill, beginning balance	0
Foreign currency translation impact	0
Goodwill, ending balance	$ 0