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INVENTORIES (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials and components $ 135,878 $ 115,083
Finished goods 114,829 48,698
Work in progress 15,261 13,119
Aftermarket parts 7,484 6,421
Used trailers 821 1,083
Total inventory $ 274,273 $ 184,404