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

  
June 30, 2016
  
December 31, 2015
 
  
(thousands of dollars)
 
Trade receivables
 
$
17,881
  
$
19,684
 
Less allowance for doubtful accounts
  
(300
)
  
(210
)
Trade receivables, net
 
$
17,581
  
$
19,474