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 - Schedule of Sales by Major Product Line (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue
Total net sales	$ 137,466	$ 145,345	$ 402,582	$ 408,867
Rail, Technologies, and Services
Disaggregation of Revenue
Total net sales	79,498	86,866	247,715	242,866
Precast Concrete Products
Disaggregation of Revenue
Total net sales	42,688	38,642	97,730	96,795
Steel Products
Disaggregation of Revenue
Total net sales	15,280	19,837	57,137	69,206
Infrastructure Solutions
Disaggregation of Revenue
Total net sales	57,968	58,479	154,867	166,001
Rail Products \| Rail, Technologies, and Services
Disaggregation of Revenue
Total net sales	47,442	60,137	156,803	164,612
Global Friction Management \| Rail, Technologies, and Services
Disaggregation of Revenue
Total net sales	19,548	16,125	51,008	49,624
Technology Services and Solutions \| Rail, Technologies, and Services
Disaggregation of Revenue
Total net sales	$ 12,508	$ 10,604	$ 39,904	$ 28,630