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Earnings Per Share
3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Earnings Per Share
4.
Earnings Per Share
The calculation of basic earnings per share is based on the weighted average number of common shares considered outstanding during the periods. The calculation of diluted earnings per share reflects the effect of all potentially dilutive securities (principally outstanding stock options and restricted stock grants). Securities that are anti-dilutive have been excluded and are not significant. The number of weighted average shares used in the calculation of basic earnings per share and diluted earnings per share was as follows:
 
Three Months Ended
 
 
March 31,
 
 
2020
 
 
2019
 
 
(In thousands)
 
Weighted average shares:
 
 
 
 
 
 
Basic shares
 
 
228,962
 
   
226,861
 
Equity-based compensation plans
 
 
1,910
 
   
1,825
 
                 
Diluted shares
 
 
230,872
 
   
228,686