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INVENTORIES (Tables)
3 Months Ended
Mar. 31, 2013
INVENTORIES [Abstract]  
Inventories
Inventories include the following:

   
March 31, 2013
  
December 31, 2012
 
   
(thousands of dollars)
 
Raw material
 $3,850  $3,591 
Petrochemical products
  8,448   6,249 
Total inventory
 $12,298  $9,840