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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales | $ 149,379 | $ 154,276 | $ 200,933 | $ 150,469 | $ 164,531 | $ 167,094 | $ 172,890 | $ 122,454 | $ 655,057 | $ 626,969
Rail Products and Services |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 321,808 | 319,524
Rail Products and Services | Rail Products |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 194,464 | 188,590
Rail Products and Services | Rail Technologies |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 127,344 | 130,934
Construction Products |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 182,486 | 158,653
Construction Products | Piling and Fabricated Bridge |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 114,076 | 102,246
Construction Products | Precast Concrete Products |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 68,410 | 56,407
Tubular and Energy Services |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 150,763 | 148,792
Tubular and Energy Services | Test Inspection and Threading |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 51,003 | 59,766
Tubular and Energy Services | Protective Coating and Measurements Systems |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | $ 99,760 | $ 89,026

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