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Inventories (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Inventories |  |
Finished goods | $ 65,530 | $ 42,125
Work-in-process | 11,187 | 6,906
Raw material and supplies | 35,653 | 28,911
Inventories | 112,370 | 77,942
Inventories - truck chassis floor plan | $ 8,774 | $ 6,539

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