Business Segments (Reconciliation of Revenue from Segments to Consolidated) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Net Sales	$ 131,492	$ 114,644	$ 395,054	$ 376,948
Segment Profit	9,157	(7,657)	19,868	(132,602)
Rail Products and Services
Segment Reporting Information [Line Items]
Net Sales	62,095	56,891	187,922	188,686
Segment Profit	3,472	(2,047)	8,938	(26,474)
Construction Products
Segment Reporting Information [Line Items]
Net Sales	39,118	34,870	121,905	107,098
Segment Profit	3,387	1,356	9,156	5,748
Tubular and Energy Services
Segment Reporting Information [Line Items]
Net Sales	30,279	22,883	85,227	81,164
Segment Profit	$ 2,298	$ (6,966)	$ 1,774	$ (111,876)