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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2019
Earnings Per Share [Abstract] |
Computation of basic and diluted earnings per share |
| For the Three Months Ended March 31,
| 2019 |  | 2018
Numerator (basic and diluted): |  |  |
Net income | $ | 321,152 |  |  | $ | 304,906 |
Denominator: |  |  |
Weighted-average common shares outstanding – basic | 78,484 |  |  | 83,530 |
Effect of stock options (1) | 813 |  |  | 993 |
Weighted-average common shares outstanding – assuming dilution | 79,297 |  |  | 84,523 |
Earnings per share: |  |  |
Earnings per share-basic | $ | 4.09 |  |  | $ | 3.65 |
Earnings per share-assuming dilution | $ | 4.05 |  |  | $ | 3.61 |
Antidilutive potential common shares not included in the calculation of diluted earnings per share: |  |  |
Stock options (1) | 176 |  |  | 761 |
Weighted-average exercise price per share of antidilutive stock options (1) | $ | 347.98 |  |  | $ | 259.28 |
(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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