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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share Basic And Diluted | The following table reconciles the numerators and denominators used in the calculation of basic and diluted earnings per share (EPS):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Numerators: |  |  |  |  |  |  |
Numerator for both basic and diluted EPS, net income | $ | 88,535,947 |  |  | $ | 86,485,242 |  |  | $ | 186,092,688 |  |  | $ | 166,765,236 |
Denominators: |  |  |  |  |  |  |
Denominator for basic EPS, weighted-average shares outstanding | 286,722,482 |  |  | 288,803,045 |  |  | 286,956,367 |  |  | 288,943,030 |
Potentially dilutive shares resulting from stock plans | 3,120,420 |  |  | 2,660,838 |  |  | 3,581,875 |  |  | 2,429,695 |
Denominator for diluted EPS | 289,842,902 |  |  | 291,463,883 |  |  | 290,538,242 |  |  | 291,372,725 |
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive | 873,937 |  |  | 4,330,316 |  |  | 109,597 |  |  | 6,563,404 |

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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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