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NET INCOME PER COMMON SHARE (Tables)
 12 Months Ended
Dec. 31, 2015
NET INCOME PER COMMON SHARE [Abstract]  
Net Income Per Common Share
  
Year ended December 31,
 
  
2015
  
2014
  
2013
 
  
(thousands of dollars)
 
          
Net income
 
$
18,598
  
$
15,571
  
$
19,498
 
             
Basic earnings per common share:
            
    Weighted average shares outstanding
  
24,370
   
24,188
   
24,115
 
             
    Per share amount (dollars)
 
$
0.76
  
$
0.64
  
$
0.81
 
Diluted earnings per common share:
            
    Weighted average shares outstanding
  
25,181
   
24,896
   
24,745
 
             
    Per share amount (dollars)
 
$
0.74
  
$
0.63
  
$
0.79
 

Weighted average shares-denominator
  basic computation
24,370
24,188
24,115
Unvested restricted stock grant
141
-
-
Effect of dilutive stock options
     670
     708
     630
Weighted average shares, as adjusted
  denominator diluted computation
25,181
24,896
24,745