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Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue |  |
Total net sales | $ 122,454 | $ 118,702
Rail Products and Services |  |
Disaggregation of Revenue |  |
Total net sales | 62,170 | 56,480
Rail Products and Services | Rail Products |  |
Disaggregation of Revenue |  |
Total net sales | 36,034 | 34,365
Rail Products and Services | Rail Technologies |  |
Disaggregation of Revenue |  |
Total net sales | 26,136 | 22,115
Construction Products |  |
Disaggregation of Revenue |  |
Total net sales | 28,900 | 37,322
Construction Products | Piling and Fabricated Bridge |  |
Disaggregation of Revenue |  |
Total net sales | 18,861 | 29,223
Construction Products | Precast Concrete Products |  |
Disaggregation of Revenue |  |
Total net sales | 10,039 | 8,099
Tubular and Energy Services |  |
Disaggregation of Revenue |  |
Total net sales | 31,384 | 24,900
Tubular and Energy Services | Test, Inspection, and Threading |  |
Disaggregation of Revenue |  |
Total net sales | 14,213 | 10,882
Tubular and Energy Services | Protective Coatings and Measurement Solutions |  |
Disaggregation of Revenue |  |
Total net sales | $ 17,171 | $ 14,018

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