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TRADE RECEIVABLES (Tables)
9 Months Ended
Sep. 30, 2016
TRADE RECEIVABLES [Abstract]  
Trade Receivables
Trade receivables, net, consisted of the following:

   
September 30, 2016
  
December 31, 2015
 
   
(thousands of dollars)
 
Trade receivables
 $20,129  $19,684 
Less allowance for doubtful accounts
  (300)  (210)
    Trade receivables, net
 $19,829  $19,474