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EARNINGS PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share |
Computation of basic and diluted earnings per share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended
​ | ​ | December 31,
​ |  | 2021 |  | 2020 |  | 2019
Numerator (basic and diluted): |  | ​ |  |  | ​ |  |  | ​ |
Net income | ​ | $ | 2,164,685 | ​ | $ | 1,752,302 | ​ | $ | 1,391,042
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Denominator: | ​ |  |  | ​ |  |  | ​ |  |
Weighted-average common shares outstanding – basic | ​ |  | 68,967 | ​ |  | 73,817 | ​ |  | 76,985
Effect of stock options (1) | ​ |  | 644 | ​ |  | 645 | ​ |  | 803
Weighted-average common shares outstanding – assuming dilution | ​ |  | 69,611 | ​ |  | 74,462 | ​ |  | 77,788
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Earnings per share: | ​ |  |  | ​ |  |  | ​ |  |
Earnings per share-basic | ​ | $ | 31.39 | ​ | $ | 23.74 | ​ | $ | 18.07
Earnings per share-assuming dilution | ​ | $ | 31.10 | ​ | $ | 23.53 | ​ | $ | 17.88
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Antidilutive potential common shares not included in the calculation of diluted earnings per share: | ​ |  |  | ​ |  |  | ​ |  |
Stock options (1) | ​ |  | 111 | ​ |  | 291 | ​ |  | 229
Weighted-average exercise price per share of antidilutive stock options (1) | ​ | $ | 479.90 | ​ | $ | 393.42 | ​ | $ | 368.11
(1) | See Note 12 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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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