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INVENTORIES - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials and components $ 115,083 $ 83,834
Finished goods 48,698 54,000
Work in progress 13,119 29,123
Used trailers 1,083 7,330
Aftermarket parts 6,421 6,448
Inventories $ 184,404 $ 180,735