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INVENTORIES Summary of Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials and components $ 138,981 $ 115,083
Finished goods 96,334 48,698
Work in progress 13,955 13,119
Aftermarket parts 7,141 6,421
Used trailers 569 1,083
Total inventory $ 256,980 $ 184,404