Revenue - Timing of Transfer (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue
Total net sales	$ 124,320	$ 115,488
Point in time
Disaggregation of Revenue
Total net sales	95,196	82,962
Over time
Disaggregation of Revenue
Total net sales	29,124	32,526
Rail, Technologies, and Services
Disaggregation of Revenue
Total net sales	82,623	64,384
Rail, Technologies, and Services | Point in time
Disaggregation of Revenue
Total net sales	65,539	53,834
Rail, Technologies, and Services | Over time
Disaggregation of Revenue
Total net sales	17,084	10,550
Infrastructure Solutions
Disaggregation of Revenue
Total net sales	41,697	51,104
Infrastructure Solutions | Point in time
Disaggregation of Revenue
Total net sales	29,657	29,128
Infrastructure Solutions | Over time
Disaggregation of Revenue
Total net sales	$ 12,040	$ 21,976