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Business Segments (Reconciliation of Significant Reconciling Items) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 171,419 | $ 166,832 | $ 309,326 | $ 278,246
Segment Profit | 11,929 | 12,933 | 21,187 | 20,051
Rail Products and Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 86,882 | 107,484 | 164,558 | 180,980
Segment Profit | 6,413 | 6,836 | 12,485 | 12,152
Construction Products Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 49,516 | 41,810 | 83,806 | 69,193
Segment Profit | 5,158 | 3,371 | 6,386 | 4,587
Tubular and Energy Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 35,021 | 17,538 | 60,962 | 28,073
Segment Profit | $ 358 | $ 2,726 | $ 2,316 | $ 3,312

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