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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventories    
Finished goods $ 43,192 $ 35,547
Work-in-process 7,357 7,774
Raw material and supplies 31,447 28,203
Inventories 81,996 71,524
Inventories - truck chassis floor plan $ 4,204 $ 7,711