Revenue - Timing of Transfer (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue
Total net sales	$ 140,796	$ 148,034	$ 265,116	$ 263,522
Point in time
Disaggregation of Revenue
Total net sales	105,050	110,870	200,246	193,832
Over time
Disaggregation of Revenue
Total net sales	35,746	37,164	64,870	69,690
Rail, Technologies, and Services
Disaggregation of Revenue
Total net sales	85,594	91,616	168,217	156,000
Rail, Technologies, and Services | Point in time
Disaggregation of Revenue
Total net sales	69,923	75,923	135,462	129,757
Rail, Technologies, and Services | Over time
Disaggregation of Revenue
Total net sales	15,671	15,693	32,755	26,243
Infrastructure Solutions
Disaggregation of Revenue
Total net sales	55,202	56,418	96,899	107,522
Infrastructure Solutions | Point in time
Disaggregation of Revenue
Total net sales	35,127	34,947	64,784	64,075
Infrastructure Solutions | Over time
Disaggregation of Revenue
Total net sales	$ 20,075	$ 21,471	$ 32,115	$ 43,447