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										12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Net Sales	$ 140,724	$ 170,346	[1]	$ 163,180	[2]	$ 114,291	$ 133,735	$ 158,323	$ 169,591	$ 113,688	$ 588,541	$ 575,337	$ 467,058
Segment Profit											29,787	41,857	36,210
Segment Assets	291,718						291,651				291,718	291,651	296,591
Depreciation/Amortization											12,454	11,541	8,853
Expenditures for Long-Lived Assets											6,004	10,938	5,035
Rail Products Segment [Member]
Segment Reporting Information [Line Items]
Net Sales											370,322	315,133	211,974
Segment Profit											9,074	18,724	11,905
Segment Assets	204,341						191,278				204,341	191,278	203,263
Depreciation/Amortization											9,736	8,908	6,327
Expenditures for Long-Lived Assets											4,180	5,894	3,094
Construction Products Segment [Member]
Segment Reporting Information [Line Items]
Net Sales											169,253	227,734	227,865
Segment Profit											7,859	16,323	20,356
Segment Assets	73,804						88,615				73,804	88,615	87,121
Depreciation/Amortization											2,119	2,180	1,761
Expenditures for Long-Lived Assets											474	1,049	1,398
Tubular Products Segments [Member]
Segment Reporting Information [Line Items]
Net Sales											48,966	32,470	27,219
Segment Profit											12,854	6,810	3,949
Segment Assets	13,573						11,758				13,573	11,758	6,207
Depreciation/Amortization											599	453	765
Expenditures for Long-Lived Assets											$ 1,350	$ 3,995	$ 543

[1] Includes a pre-tax loss of approximately $315,000 from the Company’s sale of Precise

[2] Includes a pre-tax gain of approximately $3,508,000 from the Company’s sale of SSD.