Other Expense (Income) (Details) - USD ($) $ in Thousands			12 Months Ended
	Mar. 30, 2023	Aug. 01, 2022	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Loss
Insurance proceeds			$ (215)	$ (790)
Costs recovered from environmental cleanup activities			0	(325)
Foreign currency losses			77	434
Other			(673)	(847)
Other expense (income) - net			3,666	(1,550)
Loss on asset divestitures	$ 2,065	$ 467	3,074	214
Chemtec Energy Services LLC
Accumulated Other Comprehensive Loss
Loss on sale/disposal of assets			2,065	0
Bridge Grid Deck Product
Accumulated Other Comprehensive Loss
Loss on sale/disposal of assets			1,403	0
Concrete Ties
Accumulated Other Comprehensive Loss
Loss on sale/disposal of assets			1,009	0
Piling Products
Accumulated Other Comprehensive Loss
Loss on sale/disposal of assets			0	(489)
Track Components
Accumulated Other Comprehensive Loss
Loss on sale/disposal of assets			$ 0	$ 467