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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Computation of basic and diluted earnings per share |
| For the Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Numerator (basic and diluted): |  |  |  |  |
Net income | $ | 1,133,804 |  |  | $ | 1,037,691 |  |  | $ | 931,216 |
Denominator: |  |  |  |  |
Weighted-average common shares outstanding – basic | 88,426 |  |  | 95,447 |  |  | 99,965 |
Effect of stock options (1) | 1,076 |  |  | 1,273 |  |  | 1,549 |
Weighted-average common shares outstanding – assuming dilution | 89,502 |  |  | 96,720 |  |  | 101,514 |
Earnings per share: |  |  |  |  |
Earnings per share-basic | $ | 12.82 |  |  | $ | 10.87 |  |  | $ | 9.32 |
Earnings per share-assuming dilution | $ | 12.67 |  |  | $ | 10.73 |  |  | $ | 9.17 |
Antidilutive potential common shares not included in the calculation of diluted earnings per share: |  |  |  |  |
Stock options (1) | 715 |  |  | 332 |  |  | 245 |
Weighted-average exercise price per share of antidilutive stock options (1) | $ | 252.16 |  |  | $ | 265.77 |  |  | $ | 216.29 |
(1) | See Note 9 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/2003/role/presentationRef -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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