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Earnings Per Share
 12 Months Ended
Dec. 31, 2017
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)
 
2017
  
2016
  
2015
 
Numerator:
         
Net income
 
$
51,493
  
$
47,346
  
$
46,432
 
             
Denominator:
            
Basic earnings per share:
            
Weighted average shares
  
17,631
   
17,548
   
17,431
 
Diluted earnings per share:
            
Dilutive effect of equity grants
  
22
   
18
   
52
 
Adjusted weighted average shares
  
17,653
   
17,566
   
17,483
 
             
Earnings per share:
            
Basic earnings per share
 
$
2.92
  
$
2.70
  
$
2.66
 
Diluted earnings per share
  
2.92
   
2.70
   
2.66
 

There were no options to purchase common shares that were excluded from the diluted calculations above for the years ended December 31, 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.  Options to purchase 58,063 common shares at a weighted average price of $35.409 were excluded from the diluted calculations above for the year ended December 31, 2015, because the exercise prices on the options were greater than the average market price for the period.