Quarterly report pursuant to Section 13 or 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventories    
Finished goods and work-in-process $ 46,183 $ 44,047
Raw material and supplies 31,264 26,824
Inventories 77,447 70,871
Inventories - truck chassis floor plan $ 6,034 $ 3,939