Business Segments (Schedule Of Net Sales, Profits, Assets, Depreciation/Amortization And Expenditures By Reporting Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Net Sales	$ 129,321	$ 114,291
Segment Profit	9,270	6,236
Rail Products Segment [Member]
Segment Reporting Information [Line Items]
Net Sales	81,399	66,631
Segment Profit	6,201	3,449
Construction Products Segment [Member]
Segment Reporting Information [Line Items]
Net Sales	36,811	38,363
Segment Profit	462	475
Tubular Products Segments [Member]
Segment Reporting Information [Line Items]
Net Sales	11,111	9,297
Segment Profit	$ 2,607	$ 2,312