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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Inventories    
Finished goods $ 42,125 $ 43,192
Work-in-process 6,906 7,357
Raw material and supplies 28,911 31,447
Inventories 77,942 81,996
Inventories - truck chassis floor plan $ 6,539 $ 4,204