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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