Business Segments (Reconciliation of Significant Reconciling Items) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net sales	$ 111,414	$ 129,321
Segment Profit	7,118	9,270
Assets	411,165		413,654
Depreciation and amortization	2,902	2,365
Payments to Acquire Property, Plant, and Equipment	3,499	1,031
Rail Products Segment [Member]
Segment Reporting Information [Line Items]
Net sales	73,496	81,399
Segment Profit	5,316	6,201
Construction Products Segment [Member]
Segment Reporting Information [Line Items]
Net sales	27,383	36,811
Segment Profit	1,216	462
Tubular Products Segments [Member]
Segment Reporting Information [Line Items]
Net sales	10,535	11,111
Segment Profit	$ 586	$ 2,607