Business Segments - Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Segment Reporting Information
TOTAL ASSETS	$ 333,261	$ 312,401
Operating Segments | Rail, Technologies, and Services
Segment Reporting Information
TOTAL ASSETS	174,486	156,638
Operating Segments | Infrastructure Solutions
Segment Reporting Information
TOTAL ASSETS	129,769	130,247
Unallocated corporate assets
Segment Reporting Information
TOTAL ASSETS	$ 29,006	$ 25,516