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INVENTORIES (Schedule of Inventories, Net of Reserves) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
INVENTORIES    
Chassis $ 6,816 $ 6,561
Raw materials 41,223 39,444
Work in process 16,694 16,520
Finished goods 26,169 25,440
Inventories $ 90,902 $ 87,965