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TRADE RECEIVABLES (Tables)
 3 Months Ended
Mar. 31, 2017
TRADE RECEIVABLES [Abstract]  
Trade Receivables
Trade receivables, net, consisted of the following:

  
March 31, 2017
  
December 31, 2016
 
  
(thousands of dollars)
 
Trade receivables
 
$
24,548
  
$
22,493
 
Less allowance for doubtful accounts
  
(300
)
  
(300
)
    Trade receivables, net
 
$
24,248
  
$
22,193