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TRADE RECEIVABLES (Tables)
12 Months Ended
Dec. 31, 2014
TRADE RECEIVABLES [Abstract]  
Trade Receivables
Trade receivables, net, at December 31, 2014, and 2013, respectively, consisted of the following:

   
2014
  
2013
 
   
(thousands of dollars)
 
        
Trade receivables
 $28,481  $22,279 
Less allowance for doubtful accounts
  (210)  (210)
          
  Trade receivables, net
 $28,271  $22,069