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INVENTORIES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Significant components of inventory          
Raw materials $ 16,685   $ 16,685   $ 15,219
Finished goods 22,570   22,570   28,540
Materials and supplies 697   697   1,233
Inventory net 39,952   39,952   $ 44,992
Inventory write-down $ 100 $ 100 $ 209 $ 394