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Accounts Receivable - Segment (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts Receivable |  |
Trade accounts receivable - net | $ 55,911 | $ 58,212
Rail, Technologies, and Services |  |
Accounts Receivable |  |
Trade accounts receivable - net | 34,827 | 33,960
Precast Concrete Products |  |
Accounts Receivable |  |
Trade accounts receivable - net | 10,809 | 11,119
Steel Products and Measurement |  |
Accounts Receivable |  |
Trade accounts receivable - net | $ 10,275 | $ 13,133

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