NET INCOME PER COMMON SHARE (Tables)

12 Months Ended

Dec. 31, 2013

NET INCOME PER COMMON SHARE [Abstract]

Net Income Per Common Share

	Year ended December 31,
	2013		2012		2011
	(thousands of dollars)
Net income	$	19,498	$	10,321	$	13,884
Basic earnings per common share:
Weighted average shares outstanding		24,115		24,081		23,993
Per share amount (dollars)	$	0.81	$	0.43	$	0.58
Diluted earnings per common share:
Weighted average shares outstanding		24,745		24,745		24,267
Per share amount (dollars)	$	0.79	$	0.42	$	0.57

Weighted average shares-denominator basic computation	24,115	24,081	23,993
Effect of dilutive stock options	630	664	274
Weighted average shares, as adjusted denominator diluted computation	24,745	24,745	24,267