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Business Segments (Reconciliation of Significant Reconciling Items) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 111,414 | $ 129,321 |
Segment Profit | 7,118 | 9,270 |
Assets | 411,165 |  | 413,654
Depreciation and amortization | 2,902 | 2,365 |
Payments to Acquire Property, Plant, and Equipment | 3,499 | 1,031 |
Rail Products Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 73,496 | 81,399 |
Segment Profit | 5,316 | 6,201 |
Construction Products Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 27,383 | 36,811 |
Segment Profit | 1,216 | 462 |
Tubular Products Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 10,535 | 11,111 |
Segment Profit | $ 586 | $ 2,607 |

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