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TRADE RECEIVABLES (Tables)
 6 Months Ended
Jun. 30, 2018
Receivables [Abstract]  
Trade Receivables
Trade receivables, net, consisted of the following:
 
 
June 30, 2018

 
December 31, 2017

 
 
(thousands of dollars)
Trade receivables
 
$
26,895

 
$
26,079

Less allowance for doubtful accounts
 
(428
)
 
(300
)
Trade receivables, net
 
$
26,467

 
$
25,779