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INVENTORIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Significant components of inventory      
Raw materials $ 16,701 $ 12,365  
Finished goods 16,683 24,724  
Materials and supplies   453  
Total 33,384 37,542  
Inventory write-downs 852 250 $ 442
Inventory Valuation Reserves $ 4,100 $ 4,100