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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2015
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:

  
Three Months Ended
 
  
March 31
 
(in thousands except per share data)
 
2015
  
2014
 
Numerator:
    
Net income
 
$
10,938
  
$
10,140
 
         
Denominator:
        
Basic earnings per share:
        
Weighted average shares
  
17,400
   
17,308
 
Diluted earnings per share:
        
Effect of dilutive stock options and restricted stock grants
  
51
   
95
 
Adjusted weighted average shares
  
17,451
   
17,403
 
         
Earnings per share:
        
Basic earnings per share
 
$
0.63
  
$
0.59
 
Diluted earnings per share
  
0.63
   
0.58