Business Segments - Sales by Major Product Line (Details) - USD ($) $ in Thousands	12 Months Ended
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

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.

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+ Details