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Inventories (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Inventories |  |
Finished goods | $ 61,379 | $ 39,496
Work-in-process | 7,156 | 8,253
Raw material and supplies | 31,338 | 31,733
Inventories | 99,873 | 79,482
Inventories - truck chassis floor plan | $ 12,112 | $ 8,146

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