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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Accounting Policies [Abstract] |
Calculation Of Basic And Diluted Earnings Per Share | The calculations of basic and diluted earnings per share for 2016, 2015 and 2014 are:
|  | 2016 |  | 2015 |  | 2014
Net income |  | $ | 333,817 |  |  | $ | 331,655 |  |  | $ | 318,713 |
Shares used to compute basic earnings per common share |  | 161,350,000 |  |  | 165,725,000 |  |  | 168,246,000 |
Dilutive effect of stock options |  | 3,081,000 |  |  | 3,873,000 |  |  | 4,319,000 |
Shares used to compute diluted earnings per common share |  | 164,431,000 |  |  | 169,598,000 |  |  | 172,565,000 |
Basic earnings per common share |  | $ | 2.07 |  |  | $ | 2.00 |  |  | $ | 1.89 |
Diluted earnings per common share |  | $ | 2.03 |  |  | $ | 1.96 |  |  | $ | 1.85 |

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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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