Business Segments - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended			9 Months Ended
	Jun. 30, 2023	Mar. 30, 2023	Dec. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information
Total net sales				$ 145,345	$ 130,015	$ 408,867	$ 360,324
Other (expense) income - net				(917)	(168)	(3,463)	1,096
Proceeds from business dispositions						7,706	8,800
Loss (gain) on asset divestitures						3,074	(44)
Bridge Grid Deck Product | Discontinued Operations
Segment Reporting Information
Total net sales				283	$ 2,967	3,749	$ 12,975
Other (expense) income - net						1,069
Inventory write-down						345
Personnel expenses						462
Other exit costs						$ 262
Reduction in net sales				1,977
Reduction in gross profit				$ 3,051
Bridge Grid Deck Product | Discontinued Operations | Forecast
Segment Reporting Information
Personnel expenses			$ 520
Rail Products
Segment Reporting Information
Proceeds from business dispositions	$ 2,362
Loss (gain) on asset divestitures	$ 1,009	$ 2,065
Coatings and Measurement
Segment Reporting Information
Proceeds from business dispositions		$ 5,344