Business Segments (Reconciliation of Revenue from Segments to Consolidated) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Net Sales	$ 144,860	$ 135,994	$ 263,562	$ 262,304
Segment Profit (Loss)	8,511	(124,207)	10,711	(124,945)
Rail Products and Services
Segment Reporting Information [Line Items]
Net Sales	69,347	67,503	125,827	131,795
Segment Profit (Loss)	3,977	(25,168)	5,466	(24,427)
Construction Products
Segment Reporting Information [Line Items]
Net Sales	45,465	40,348	82,787	72,228
Segment Profit (Loss)	4,551	3,944	5,770	4,392
Tubular and Energy Services
Segment Reporting Information [Line Items]
Net Sales	30,048	28,143	54,948	58,281
Segment Profit (Loss)	$ (17)	$ (102,983)	$ (525)	$ (104,910)