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Business Segments - Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Segment Reporting Information |  |
Assets | $ 374,476 | $ 370,395
Operating Segments | Rail Technologies and Services |  |
Segment Reporting Information |  |
Assets | 174,782 | 161,485
Operating Segments | Infrastructure Solutions |  |
Segment Reporting Information |  |
Assets | 136,649 | 137,519
Unallocated corporate assets |  |
Segment Reporting Information |  |
Assets | $ 63,045 | $ 71,391

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