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Earnings Per Share
 12 Months Ended
Dec. 31, 2018
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)
 
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
 

There were no options to purchase common shares that were excluded from the diluted calculations above for the years ended December 31, 2018, 2017, and 2016.  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.