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

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Revenue - Sales by Major Product Line (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue
Total net sales	$ 140,796	$ 148,034	$ 265,116	$ 263,522
Rail, Technologies, and Services
Disaggregation of Revenue
Total net sales	85,594	91,616	168,217	156,000
Precast Concrete Products
Disaggregation of Revenue
Total net sales	33,950	33,865	55,041	58,153
Steel Products
Disaggregation of Revenue
Total net sales	21,252	22,553	41,858	49,369
Infrastructure Solutions
Disaggregation of Revenue
Total net sales	55,202	56,418	96,899	107,522
Rail Products \| Rail, Technologies, and Services
Disaggregation of Revenue
Total net sales	56,323	64,246	109,361	104,475
Global Friction Management \| Rail, Technologies, and Services
Disaggregation of Revenue
Total net sales	17,438	17,680	31,459	33,499
Technology Services and Solutions \| Rail, Technologies, and Services
Disaggregation of Revenue
Total net sales	$ 11,833	$ 9,690	$ 27,397	$ 18,026