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Earnings Per Share
3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Earnings Per Share 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,
20212020
(In thousands)
Weighted average shares:
Basic shares230,435 228,962 
Equity-based compensation plans1,861 1,910 
Diluted shares232,296 230,872