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Business Segments (Reconciliation of Revenue from Segments to Consolidated) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information |  |
Net Sales | $ 122,454 | $ 118,702
Operating Segments |  |
Segment Reporting Information |  |
Net Sales | 122,454 | 118,702
Segment Profit (Loss) | 3,951 | 1,809
Operating Segments | Rail Products and Services |  |
Segment Reporting Information |  |
Net Sales | 62,170 | 56,480
Segment Profit (Loss) | 2,048 | 823
Operating Segments | Construction Products |  |
Segment Reporting Information |  |
Net Sales | 28,900 | 37,322
Segment Profit (Loss) | 18 | 1,666
Operating Segments | Tubular and Energy Services |  |
Segment Reporting Information |  |
Net Sales | 31,384 | 24,900
Segment Profit (Loss) | $ 1,885 | $ (680)

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