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INVENTORIES (Tables)
9 Months Ended
Sep. 30, 2016
INVENTORIES [Abstract]  
Inventories
Inventories include the following:

   
September 30, 2016
  
December 31, 2015
 
   
(thousands of dollars)
 
Raw material
 $2,074  $2,905 
Work in process
  72   56 
Finished products
  16,230   12,843 
    Total inventory
 $18,376  $15,804