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Common and Common Equivalent Shares
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Common and Common Equivalent Shares
14.
Common and Common Equivalent Shares:
 
 
 
 
 
The calculation of shares used in the basic and diluted net income per share calculation for the years ended December 31, 2019, 2018, and 2017 is as follows (in thousands):
 
                         
 
Years Ended December 31,
 
 
2019
 
  
2018
 
  
2017
 
Weighted average number of common shares outstanding
   
83,495
     
91,104
     
92,431
 
Weighted average number of dilutive common share equivalents
(a)
   
—  
      
502
     
527
 
                         
Weighted average number of common and common equivalent shares outstanding
   
83,495
     
91,606
     
92,958
 
                         
Antidilutive securities not included in the diluted net income per common share calculation
   
516
     
214
     
107
 
                         
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(a)
 Due to a loss for the year ended December 31, 2019, no incremental shares are included because the effect would be antidilutive.