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Inventories (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Inventories |  |
Finished goods | $ 49,354 | $ 39,496
Work-in-process | 8,653 | 8,253
Raw material and supplies | 42,127 | 31,733
Inventories | 100,134 | 79,482
Inventories - truck chassis floor plan | $ 7,916 | $ 8,146

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