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INVENTORIES, NET (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials and components $ 134,085 $ 99,418
Finished goods 77,747 44,695
Work in progress 8,806 11,592
Aftermarket parts 5,453 6,567
Used trailers 1,081 1,478
Total inventory $ 227,172 $ 163,750