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Business Segment - Sales by Major Product Line (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Revenue from External Customer |  |
Net Sales | $ 513,620 | $ 497,411
Rail, Technologies, and Services |  |
Revenue from External Customer |  |
Net Sales | 299,749 | 276,447
Precast Concrete Products |  |
Revenue from External Customer |  |
Net Sales | 70,990 | 63,314
Steel Products and Measurement |  |
Revenue from External Customer |  |
Net Sales | 142,881 | 157,650
Rail Products and Friction Management | Rail, Technologies, and Services |  |
Revenue from External Customer |  |
Net Sales | 248,237 | 231,726
Technology Services and Solutions | Rail, Technologies, and Services |  |
Revenue from External Customer |  |
Net Sales | 51,512 | 44,721
Precast Concrete Buildings | Precast Concrete Products |  |
Revenue from External Customer |  |
Net Sales | 55,993 | 51,111
Other Precast Concrete Products | Precast Concrete Products |  |
Revenue from External Customer |  |
Net Sales | 14,997 | 12,203
Coatings and Measurement | Steel Products and Measurement |  |
Revenue from External Customer |  |
Net Sales | 27,833 | 59,037
Fabricated Steel Products | Steel Products and Measurement |  |
Revenue from External Customer |  |
Net Sales | $ 115,048 | $ 98,613

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