TRADE RECEIVABLES (Tables)

3 Months Ended

Mar. 31, 2018

TRADE RECEIVABLES [Abstract]

Trade Receivables

Trade receivables, net, consisted of the following:

	March 31, 2018			December 31, 2017
	(thousands of dollars)
Trade receivables	$	27,849		$	26,079
Less allowance for doubtful accounts		(428	)		(300	)
Trade receivables, net	$	27,421		$	25,779