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INVENTORIES - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials and components $ 105,332 $ 115,083
Finished goods 58,224 48,698
Work in progress 14,269 13,119
Used trailers 2,499 1,083
Aftermarket parts 6,590 6,421
Inventories $ 186,914 $ 184,404