NET INCOME PER COMMON SHARE (Tables)

12 Months Ended

Dec. 31, 2014

NET INCOME PER COMMON SHARE [Abstract]

Net Income Per Common Share

	Year ended December 31,
	2014		2013		2012
	(thousands of dollars)
Net income	$	15,571	$	19,498	$	10,321
Basic earnings per common share:
Weighted average shares outstanding		24,188		24,115		24,081
Per share amount (dollars)	$	0.64	$	0.81	$	0.43
Diluted earnings per common share:
Weighted average shares outstanding		24,896		24,745		24,745
Per share amount (dollars)	$	0.63	$	0.79	$	0.42

Weighted average shares-denominator basic computation	24,188	24,115	24,081
Effect of dilutive stock options	708	630	664
Weighted average shares, as adjusted denominator diluted computation	24,896	24,745	24,745