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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Reconciliation of the denominators used in the calculation of basic and diluted earnings per share
The following is a reconciliation of the denominators used in the calculation of basic and diluted earnings per share for the years ended December 31:

  
2017
  
2016
  
2015
 
          
Average shares outstanding for basic earnings per share
  
15,065,216
   
15,071,900
   
15,010,454
 
             
Dilutive effect of share equivalents
  
42,220
   
12,108
   
11,308
 
             
Average shares outstanding for diluted earnings per share
  
15,107,436
   
15,084,008
   
15,021,762