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Revenue - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue |  |
Total net sales | $ 128,775 | $ 150,469
Rail Products and Services |  |
Disaggregation of Revenue |  |
Total net sales | 70,204 | 75,694
Rail Products and Services | Rail Products |  |
Disaggregation of Revenue |  |
Total net sales | 43,562 | 46,206
Rail Products and Services | Rail Technologies |  |
Disaggregation of Revenue |  |
Total net sales | 26,642 | 29,488
Construction Products |  |
Disaggregation of Revenue |  |
Total net sales | 29,034 | 37,345
Construction Products | Piling and Fabricated Bridge |  |
Disaggregation of Revenue |  |
Total net sales | 18,391 | 23,732
Construction Products | Precast Concrete Products |  |
Disaggregation of Revenue |  |
Total net sales | 10,643 | 13,613
Tubular and Energy Services |  |
Disaggregation of Revenue |  |
Total net sales | 29,537 | 37,430
Tubular and Energy Services | Test, Inspection, and Threading Services |  |
Disaggregation of Revenue |  |
Total net sales | 9,704 | 14,724
Tubular and Energy Services | Protective Coatings and Measurement Systems |  |
Disaggregation of Revenue |  |
Total net sales | $ 19,833 | $ 22,706

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