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Business Segments (Reconciliation of Revenue from Segments to Consolidated) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 149,936 | $ 163,180 | $ 279,257 | $ 277,471
Segment Profit | 12,438 | (3,700) | 21,708 | 2,536
Rail Products Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 90,892 | 101,369 | 172,291 | 168,000
Segment Profit | 5,835 | (9,610) | 12,036 | (6,161)
Construction Products Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 43,697 | 47,862 | 80,508 | 86,225
Segment Profit | 2,056 | 2,504 | 2,518 | 2,979
Tubular Products Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 15,347 | 13,949 | 26,458 | 23,246
Segment Profit | $ 4,547 | $ 3,406 | $ 7,154 | $ 5,718

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