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Earnings Per Share
9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
The following table reconciles the numerators and denominators used in the calculation of basic and diluted earnings per share (EPS):
Three Months Ended September 30, Nine Months Ended September 30, 
2018201720182017
Numerators:
Numerator for both basic and diluted EPS, net income
$111,335,817 $90,230,335 $331,608,542 $276,323,023 
Denominators:
Denominator for basic EPS, weighted-average shares outstanding 265,607,128 284,661,920 270,366,996 285,915,565 
Potentially dilutive shares resulting from stock plans 1,988,014 2,359,030 2,366,506 3,145,936 
Denominator for diluted EPS 267,595,142 287,020,950 272,733,502 289,061,501 
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive
462,631 807,013 24,590 2,847,247