Business Segments (Reconciliation of Revenue from Segments to Consolidated) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 118,702	$ 126,310
Segment Profit (Loss)	2,200	(738)
Rail Products and Services [Member]
Segment Reporting Information [Line Items]
Net sales	56,480	64,292
Segment Profit (Loss)	1,489	741
Construction Products [Member]
Segment Reporting Information [Line Items]
Net sales	37,322	31,880
Segment Profit (Loss)	1,219	448
Tubular and Energy Services [Member]
Segment Reporting Information [Line Items]
Net sales	24,900	30,138
Segment Profit (Loss)	$ (508)	$ (1,927)