Business Segments - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($) segment
Segment Reporting Information
Number of operating segments | segment		2	3
Net Sales		$ 543,744	$ 497,497
Reserve for uncollectable accounts income (expense)		1,020
Selling and Administrative Expense
Segment Reporting Information
Reserve for uncollectable accounts income (expense)		1,912	382
Discontinued Operations | Bridge Grid Deck Product
Segment Reporting Information
Net Sales		6,146	15,120
Loss on asset divestitures		1,403
Inventory write-downs		474
Personnel related expenses		667
Other exist costs		262
Discontinued Operations | Bridge Grid Deck Product | Forecast
Segment Reporting Information
Personnel related expenses	$ 184
Discontinued Operations | Bridge Grid Deck Product | Cost of Goods Sold
Segment Reporting Information
Loss on asset divestitures		1,141
Discontinued Operations | Bridge Grid Deck Product | Selling and Administrative Expense
Segment Reporting Information
Loss on asset divestitures		262
Operating Segments
Segment Reporting Information
Net Sales		543,744	497,497
Rail, Technologies, and Services
Segment Reporting Information
Net Sales		312,160	300,592
Rail, Technologies, and Services | Operating Segments
Segment Reporting Information
Net Sales		312,160	300,592
Reserve for uncollectable accounts income (expense)		1,862
Restructuring costs		676
Infrastructure Solutions
Segment Reporting Information
Net Sales		231,584	196,905
Impairment of goodwill and intangible assets			8,016
Infrastructure Solutions | Operating Segments
Segment Reporting Information
Net Sales		$ 231,584	$ 196,905