Business Segments (Schedule Of Profit Loss By Reporting Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Net Sales	$ 170,346	$ 158,323	$ 447,817	$ 441,602
Segment Profit	14,962	15,688	17,306	30,200
Rail Products Segment [Member]
Segment Reporting Information [Line Items]
Net Sales	110,993	89,378	278,993	241,016
Segment Profit	8,096	8,858	1,743	12,944
Construction Products Segment [Member]
Segment Reporting Information [Line Items]
Net Sales	45,948	60,175	132,173	176,404
Segment Profit	3,083	4,879	6,062	12,583
Tubular Products Segments [Member]
Segment Reporting Information [Line Items]
Net Sales	13,405	8,770	36,651	24,182
Segment Profit	$ 3,783	$ 1,951	$ 9,501	$ 4,673