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Business Segments (Reconciliation of Significant Reconciling Items) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting Information [Line Items] |  |
Net sales | $ 126,310 | $ 137,907
Segment Profit (Loss) | (738) | 9,258
Rail Products and Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 64,292 | 77,676
Segment Profit (Loss) | 741 | 6,072
Construction Products [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 31,880 | 34,290
Segment Profit (Loss) | 448 | 1,228
Tubular and Energy Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 30,138 | 25,941
Segment Profit (Loss) | $ (1,927) | $ 1,958

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