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TRADE RECEIVABLES
3 Months Ended
Mar. 31, 2015
TRADE RECEIVABLES [Abstract]  
TRADE RECEIVABLES
3. TRADE RECEIVABLES

Trade receivables, net, consisted of the following:

  
March 31, 2015
  
December 31, 2014
 
  
(thousands of dollars)
 
Trade receivables
 
$
25,718
  
$
28,481
 
Less allowance for doubtful accounts
  
(210
)
  
(210
)
    Trade receivables, net
 
$
25,508
  
$
28,271
 

Trade receivables serves as collateral for our amended and restated loan agreement (see Note 8).