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TRADE RECEIVABLES
6 Months Ended
Jun. 30, 2014
TRADE RECEIVABLES [Abstract]  
TRADE RECEIVABLES
3. TRADE RECEIVABLES

Trade receivables, net, at June 30, 2014, and December 31, 2013, consisted of the following:

   
June 30, 2014
  
December 31, 2013
 
   
(thousands of dollars)
 
Trade receivables
 $28,386  $22,279 
Less allowance for doubtful accounts
  (210)  (210)
    Trade receivables, net
 $28,176  $22,069 

Trade receivables serving as collateral for the Company’s line of credit with a domestic bank were $21.4 million and $17.7 million at June 30, 2014, and December 31, 2013, respectively (see Note 7).