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INVENTORIES (Schedule of Inventories, Net of Reserves) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
INVENTORIES    
Chassis $ 7,588 $ 8,921
Raw materials 40,393 40,021
Work in process 17,653 14,995
Finished goods 30,522 29,830
Inventories $ 96,156 $ 93,767