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INVENTORIES - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
INVENTORIES    
Other Inventory, in Transit, Gross $ 7,100,000 $ 18,300,000
Percentage of LIFO Inventory 91.00% 91.00%
Percentage of FIFO Inventory 9.00% 9.00%
Decrease In Cost Of Goods Sold $ 261,000