Business Segments - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information
Net Sales	$ 140,796	$ 148,034	$ 265,116	$ 263,522
Segment Operating Income	4,572	6,714	10,138	7,239
Operating Segments
Segment Reporting Information
Net Sales	140,796	148,034	265,116	263,522
Segment Operating Income	9,124	9,744	14,514	11,798
Rail, Technologies, and Services
Segment Reporting Information
Net Sales	85,594	91,616	168,217	156,000
Rail, Technologies, and Services | Operating Segments
Segment Reporting Information
Net Sales	85,594	91,616	168,217	156,000
Segment Operating Income	5,501	6,971	12,279	9,365
Infrastructure Solutions
Segment Reporting Information
Net Sales	55,202	56,418	96,899	107,522
Infrastructure Solutions | Operating Segments
Segment Reporting Information
Net Sales	55,202	56,418	96,899	107,522
Segment Operating Income	$ 3,623	$ 2,773	$ 2,235	$ 2,433