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Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue |  |
Total net sales | $ 626,969 | $ 536,377
Rail Products and Services |  |
Disaggregation of Revenue |  |
Total net sales | 319,524 | 256,127
Rail Products and Services | Rail Products |  |
Disaggregation of Revenue |  |
Total net sales | 188,590 | 155,870
Rail Products and Services | Rail Technologies |  |
Disaggregation of Revenue |  |
Total net sales | 130,934 | 100,257
Construction Products |  |
Disaggregation of Revenue |  |
Total net sales | 158,653 | 161,801
Construction Products | Piling and Fabricated Bridge |  |
Disaggregation of Revenue |  |
Total net sales | 102,246 | 105,924
Construction Products | Precast Concrete Products |  |
Disaggregation of Revenue |  |
Total net sales | 56,407 | 55,877
Tubular and Energy Services |  |
Disaggregation of Revenue |  |
Total net sales | 148,792 | 118,449
Tubular and Energy Services | Test Inspection and Threading |  |
Disaggregation of Revenue |  |
Total net sales | 59,766 | 50,683
Tubular and Energy Services | Protective Coating and Measurements Systems |  |
Disaggregation of Revenue |  |
Total net sales | $ 89,026 | $ 67,766

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