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TRADE RECEIVABLES
6 Months Ended
Jun. 30, 2015
TRADE RECEIVABLES [Abstract]  
TRADE RECEIVABLES
3. TRADE RECEIVABLES

Trade receivables, net, consisted of the following:

   
June 30, 2015
  
December 31, 2014
 
   
(thousands of dollars)
 
Trade receivables
 $22,332  $28,481 
Less allowance for doubtful accounts
  (210)  (210)
    Trade receivables, net
 $22,122  $28,271 

Trade receivables serves as collateral for our amended and restated loan agreement. See Note 8.