Quarterly report pursuant to sections 13 or 15(d)

TRADE RECEIVABLES (Tables)

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TRADE RECEIVABLES (Tables)
9 Months Ended
Sep. 30, 2013
TRADE RECEIVABLES [Abstract]  
Trade Receivables
Trade receivables, net, consisted of the following:

   
September 30, 2013
   
December 31, 2012
 
   
(thousands of dollars)
 
Trade receivables
  $ 20,530     $ 16,012  
Less allowance for doubtful accounts
    (210 )     (210 )
    Trade receivables, net
  $ 20,320     $ 15,802