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Earnings Per Share
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Earnings Per Share
23.  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)
  
2019
    
2018
    
2017
  
Numerator:
                  
Net income
  
$
64,540
    
$
59,228
    
$
51,493
  
                         
Denominator:
                        
Basic earnings per share:
                        
Weighted average shares
    
17,724
      
17,687
      
17,631
  
Diluted earnings per share:
                        
Dilutive effect of equity grants
    
16
      
16
      
22
  
Adjusted weighted average shares
    
17,740
      
17,703
      
17,653
  
                         
Earnings per share:
                        
Basic earnings per share
  
$
3.64
    
$
3.35
    
$
2.92
  
Diluted earnings per share
    
3.64
      
3.35
      
2.92
  


There were no options to purchase common shares that were excluded from the diluted calculations above for the years ended December 31, 2019, 2018, and 2017.  In addition to in-the-money stock options, unvested restricted stock grants were also used in the calculation of diluted earnings per share based on the treasury method.