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Common and Common Equivalent Shares (Tables)
9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Schedule of Calculation of Shares Used in Basic and Diluted Net Income Per Share
The calculation of shares used in the basic and diluted net income per common share calculation for the three and nine months ended September 30, 2019 and 2018 is as follows (in thousands):
                                 
 
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
 
2019
   
2018
   
2019
   
2018
 
Weighted average number of common shares outstanding
   
82,441
     
90,984
     
83,846
     
92,239
 
Weighted average number of dilutive common share equivalents
   
 
 
     
375
     
 
 
     
521
 
                                 
Weighted average number of common and common equivalent shares outstanding
 (a)
   
82,441
     
91,359
     
84,846
     
92,760
 
                                 
Antidilutive securities not included in the diluted net income per common share calculation
   
962
     
214
     
796
     
202
 
                                 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(a)
Due to a loss for the three months and nine months ended September 30, 2019,
no
incremental shares are included because the effect would be antidilutive.