Business Segments (Reconciliation of Revenue from Segments to Consolidated) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Net sales	$ 149,936	$ 163,180	$ 279,257	$ 277,471
Segment Profit	12,438	(3,700)	21,708	2,536
Rail Products Segment [Member]
Segment Reporting Information [Line Items]
Net sales	90,892	101,369	172,291	168,000
Segment Profit	5,835	(9,610)	12,036	(6,161)
Construction Products Segment [Member]
Segment Reporting Information [Line Items]
Net sales	43,697	47,862	80,508	86,225
Segment Profit	2,056	2,504	2,518	2,979
Tubular Products Segments [Member]
Segment Reporting Information [Line Items]
Net sales	15,347	13,949	26,458	23,246
Segment Profit	$ 4,547	$ 3,406	$ 7,154	$ 5,718