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Earnings Per Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings per share | NOTE 13 – EARNINGS PER SHARE The following table illustrates the computation of basic and diluted earnings per share for the years ended December 31, 2017, 2016 and 2015 (in thousands, except per share data):
| 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.
Subsequent to the end of the year and through February 28, 2018, the Company repurchased 1.1 million shares of its common stock, at an average price of $255.48, for a total investment of $289.9 million.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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