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Business Segments - Sales by Major Product Line (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Revenue from External Customer |  |
Net Sales | $ 543,744 | $ 497,497
Rail, Technologies, and Services |  |
Revenue from External Customer |  |
Net Sales | 312,160 | 300,592
Infrastructure Solutions |  |
Revenue from External Customer |  |
Net Sales | 231,584 | 196,905
Rail Products | Rail, Technologies, and Services |  |
Revenue from External Customer |  |
Net Sales | 205,797 | 202,559
Global Friction Management | Rail, Technologies, and Services |  |
Revenue from External Customer |  |
Net Sales | 63,946 | 54,811
Technology Services and Solutions | Rail, Technologies, and Services |  |
Revenue from External Customer |  |
Net Sales | 42,417 | 43,222
Precast Concrete Products | Infrastructure Solutions |  |
Revenue from External Customer |  |
Net Sales | 136,458 | 104,212
Steel Products | Infrastructure Solutions |  |
Revenue from External Customer |  |
Net Sales | $ 95,126 | $ 92,693

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