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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-URI https://asc.fasb.org//1943274/2147479806/606-10-50-4

+ Details