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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
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)
 
2018
  
2017
  
2016
 
Numerator:
         
Net income
 
$
59,228
  
$
51,493
  
$
47,346
 
             
Denominator:
            
Basic earnings per share:
            
Weighted average shares
  
17,687
   
17,631
   
17,548
 
Diluted earnings per share:
            
Dilutive effect of equity grants
  
16
   
22
   
18
 
Adjusted weighted average shares
  
17,703
   
17,653
   
17,566
 
             
Earnings per share:
            
Basic earnings per share
 
$
3.35
  
$
2.92
  
$
2.70
 
Diluted earnings per share
  
3.35
   
2.92
   
2.70