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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share |
Computation of basic and diluted earnings per share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended
​ | ​ | December 31,
​ |  | 2019 |  | 2018 |  | 2017
Numerator (basic and diluted): |  | ​ |  |  | ​ |  |  | ​ |
Net income | ​ | $ | 1,391,042 | ​ | $ | 1,324,487 | ​ | $ | 1,133,804
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Denominator: | ​ |  |  | ​ |  |  | ​ |  |
Weighted-average common shares outstanding – basic | ​ |  | 76,985 | ​ |  | 81,406 | ​ |  | 88,426
Effect of stock options (1) | ​ |  | 803 | ​ |  | 874 | ​ |  | 1,076
Weighted-average common shares outstanding – assuming dilution | ​ |  | 77,788 | ​ |  | 82,280 | ​ |  | 89,502
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Earnings per share: | ​ |  |  | ​ |  |  | ​ |  |
Earnings per share-basic | ​ | $ | 18.07 | ​ | $ | 16.27 | ​ | $ | 12.82
Earnings per share-assuming dilution | ​ | $ | 17.88 | ​ | $ | 16.10 | ​ | $ | 12.67
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Antidilutive potential common shares not included in the calculation of diluted earnings per share: | ​ |  |  | ​ |  |  | ​ |  |
Stock options (1) | ​ |  | 229 | ​ |  | 567 | ​ |  | 715
Weighted-average exercise price per share of antidilutive stock options (1) | ​ | $ | 368.11 | ​ | $ | 268.55 | ​ | $ | 252.16
(1) | See Note 11 for further information concerning the terms of the Company’s share-based compensation plans.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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