Business Segments (Reconciliation of Revenue from Segments to Consolidated) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Net sales	$ 162,248	$ 170,346	$ 441,505	$ 447,817
Segment Profit	13,553	14,770	35,261	17,306
Rail Products Segment [Member]
Segment Reporting Information [Line Items]
Net sales	105,552	110,993	277,843	278,993
Segment Profit	9,713	7,904	21,749	1,743
Construction Products Segment [Member]
Segment Reporting Information [Line Items]
Net sales	49,320	45,948	129,828	132,173
Segment Profit	2,855	3,083	5,373	6,062
Tubular Products Segments [Member]
Segment Reporting Information [Line Items]
Net sales	7,376	13,405	33,834	36,651
Segment Profit	$ 985	$ 3,783	$ 8,139	$ 9,501