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Common and Common Equivalent Shares (Tables)
3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Calculation of Shares Used in Basic and Diluted Net Income Per Share
 
  
Three Months Ended

March 31,
 
  
2019
  
2018
 
Weighted average number of common shares outstanding
  86,073   92,859 
Weighted average number of dilutive common share equivalents
  472   646 
  
 
 
  
 
 
 
Weighted average number of common and common equivalent shares outstanding
  86,545   93,505 
  
 
 
  
 
 
 
Antidilutive securities not included in the diluted net income per common share calculation
  504   1