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Business Segments - Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Segment Reporting Information |  |
Assets | $ 399,075 | $ 405,171
Operating Segments | Rail Products and Services |  |
Segment Reporting Information |  |
Assets | 170,915 | 186,323
Operating Segments | Construction Products |  |
Segment Reporting Information |  |
Assets | 88,257 | 83,049
Operating Segments | Tubular and Energy Services |  |
Segment Reporting Information |  |
Assets | 81,220 | 77,320
Unallocated corporate assets |  |
Segment Reporting Information |  |
Assets | $ 58,683 | $ 58,479

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