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Earnings Per Share
 9 Months Ended
Sep. 30, 2020
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 September 30,Nine Months Ended September 30,
2020201920202019
(In thousands)
Weighted average shares:
Basic shares229,576 228,041 229,254 227,493 
Equity-based compensation plans1,884 1,519 1,650 1,698 
Diluted shares231,460 229,560 230,904 229,191