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INVENTORIES (Inventories) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
INVENTORIES [Abstract]    
Finished products [1] $ 372,604 $ 327,711
Raw materials 27,942 27,152
Products in process 3,064 1,827
Operating supplies and other 25,720 27,648
Total 429,330 384,338
Encumbered inventories $ 3,230 $ 2,808
[1] Includes inventories encumbered by volumetric production payments (see Note 2), as follows: December 31, 2018 - $3,230 thousand and December 31, 2017 - $2,808 thousand.