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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings per Share
The following table sets forth the computation of basic and diluted earnings per share:

Year Ended December 31
(in thousands except per share data)
 
2014
  
2013
  
2012
 
Numerator:
      
Net income
 
$
43,251
  
$
45,172
  
$
44,862
 
             
Denominator:
            
Basic earnings per share:
            
Weighted average shares
  
17,326
   
17,158
   
17,013
 
Diluted earnings per share:
            
Dilutive effect of equity grants
  
71
   
82
   
60
 
Adjusted weighted average shares
  
17,397
   
17,240
   
17,073
 
             
Earnings per share:
            
Basic earnings per share
 
$
2.50
  
$
2.63
  
$
2.64
 
Diluted earnings per share
  
2.49
   
2.62
   
2.63