NET INCOME PER COMMON SHARE (Tables)

12 Months Ended

Dec. 31, 2016

NET INCOME PER COMMON SHARE [Abstract]

Net Income Per Common Share

	Year ended December 31,
	2016		2015		2014
	(thousands of dollars)
Net income	$	19,428	$	18,598	$	15,571
Basic earnings per common share:
Weighted average shares outstanding		24,284		24,370		24,188
Per share amount (dollars)	$	0.80	$	0.76	$	0.64
Diluted earnings per common share:
Weighted average shares outstanding		24,982		25,181		24,896
Per share amount (dollars)	$	0.78	$	0.74	$	0.63

Weighted average shares-denominator basic computation	24,284	24,370	24,188
Unvested restricted stock grant	310	141	-
Effect of dilutive stock options	388	670	708
Weighted average shares, as adjusted denominator diluted computation	24,982	25,181	24,896