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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

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