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FAIR VALUE MEASUREMENTS (Tables)
9 Months Ended
Sep. 30, 2012
FAIR VALUE MEASUREMENTS [Abstract]  
Fair Value of Assets and Liabilities Measured on a Recurring Basis
The following items are measured at fair value on a recurring basis subject to disclosure requirements of ASC Topic 820 at September 30, 2012, and December 31, 2011:

Assets and Liabilities Measured at Fair Value on a Recurring Basis

      
Fair Value Measurements Using
 
   
September 30, 2012
  
Level 1
  
Level 2
  
Level 3
 
   
(thousands of dollars)
 
Liabilities:
            
Financial swaps on feedstock
 $444  $444   -   - 
Interest rate swap
  978   -  $978   - 

      
Fair Value Measurements Using
 
   
December 31, 2011
  
Level 1
  
Level 2
  
Level 3
 
   
(thousands of dollars)
 
Assets:
            
Financial swaps on feedstock
 $393  $393   -   - 
                  
Liabilities:
                
Interest Rate Swap
  1,134   -  $1,134   -