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Earnings Per Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share |
Earnings per share | NOTE 17 – EARNINGS PER SHARE ​ The following table illustrates the computation of basic and diluted earnings per share for the years ended December 31, 2020, 2019 and 2018 (in thousands, except per share data): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended
​ | ​ | December 31,
​ |  | 2020 |  | 2019 |  | 2018
Numerator (basic and diluted): |  | ​ |  |  | ​ |  |  | ​ |
Net income | ​ | $ | 1,752,302 | ​ | $ | 1,391,042 | ​ | $ | 1,324,487
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Denominator: | ​ |  |  | ​ |  |  | ​ |  |
Weighted-average common shares outstanding – basic | ​ |  | 73,817 | ​ |  | 76,985 | ​ |  | 81,406
Effect of stock options (1) | ​ |  | 645 | ​ |  | 803 | ​ |  | 874
Weighted-average common shares outstanding – assuming dilution | ​ |  | 74,462 | ​ |  | 77,788 | ​ |  | 82,280
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Earnings per share: | ​ |  |  | ​ |  |  | ​ |  |
Earnings per share-basic | ​ | $ | 23.74 | ​ | $ | 18.07 | ​ | $ | 16.27
Earnings per share-assuming dilution | ​ | $ | 23.53 | ​ | $ | 17.88 | ​ | $ | 16.10
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Antidilutive potential common shares not included in the calculation of diluted earnings per share: | ​ |  |  | ​ |  |  | ​ |  |
Stock options (1) | ​ |  | 291 | ​ |  | 229 | ​ |  | 567
Weighted-average exercise price per share of antidilutive stock options (1) | ​ | $ | 393.42 | ​ | $ | 368.11 | ​ | $ | 268.55
(1) | See Note 13 for further information concerning the terms of the Company’s share-based compensation plans.
​ Subsequent to the end of the year and through February 26, 2021, the Company repurchased 1.1 million shares of its common stock, at an average price of $447.49, for a total investment of $478.4 million.

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