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Revenue - Sales by Major Product Line (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Disaggregation of Revenue |  |
Total net sales | $ 124,320 | $ 115,488
Rail, Technologies, and Services |  |
Disaggregation of Revenue |  |
Total net sales | 82,623 | 64,384
Precast Concrete Products |  |
Disaggregation of Revenue |  |
Total net sales | 21,091 | 24,288
Steel Products |  |
Disaggregation of Revenue |  |
Total net sales | 20,606 | 26,816
Infrastructure Solutions |  |
Disaggregation of Revenue |  |
Total net sales | 41,697 | 51,104
Rail Products | Rail, Technologies, and Services |  |
Disaggregation of Revenue |  |
Total net sales | 53,038 | 40,228
Global Friction Management | Rail, Technologies, and Services |  |
Disaggregation of Revenue |  |
Total net sales | 14,022 | 15,820
Technology Services and Solutions | Rail, Technologies, and Services |  |
Disaggregation of Revenue |  |
Total net sales | $ 15,563 | $ 8,336

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