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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2019
Earnings Per Share [Abstract] |
Computation of basic and diluted earnings per share |
| For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Numerator (basic and diluted): |  |  |  |  |  |  |
Net income | $ | 391,293 |  |  | $ | 366,151 |  |  | $ | 1,066,126 |  |  | $ | 1,024,130 |
Denominator: |  |  |  |  |  |  |
Weighted-average common shares outstanding – basic | 76,172 |  |  | 80,593 |  |  | 77,415 |  |  | 81,939 |
Effect of stock options (1) | 797 |  |  | 817 |  |  | 805 |  |  | 902 |
Weighted-average common shares outstanding – assuming dilution | 76,969 |  |  | 81,410 |  |  | 78,220 |  |  | 82,841 |
Earnings per share: |  |  |  |  |  |  |
Earnings per share-basic | $ | 5.14 |  |  | $ | 4.54 |  |  | $ | 13.77 |  |  | $ | 12.50 |
Earnings per share-assuming dilution | $ | 5.08 |  |  | $ | 4.50 |  |  | $ | 13.63 |  |  | $ | 12.36 |
Antidilutive potential common shares not included in the calculation of diluted earnings per share: |  |  |  |  |  |  |
Stock options (1) | 207 |  |  | 650 |  |  | 214 |  |  | 232 |
Weighted-average exercise price per share of antidilutive stock options (1) | $ | 360.80 |  |  | $ | 264.65 |  |  | $ | 360.36 |  |  | $ | 268.22 |
(1) See Note 8 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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