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Earnings Per Share | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share The following table reconciles the numerators and denominators used in the calculation of basic and diluted earnings per share (EPS):
| Three Months Ended March 31, |  |  |  |
| 2018 |  | 2017 |  |  |  |
Numerators: |  |  |  |  |  |  |
Numerator for both basic and diluted EPS, net income | $ | 111,248,743 |  | $ | 97,556,741 |  |  |  |
Denominators: |  |  |  |  |  |  |
Denominator for basic EPS, weighted-average shares outstanding | 274,759,516 |  | 287,408,900 |  |  |  |
Potentially dilutive shares resulting from stock plans | 2,749,912 |  | 4,070,938 |  |  |  |
Denominator for diluted EPS | 277,509,428 |  | 291,479,838 |  |  |  |
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive | 156,467 |  | 2,311 |  |  |  |

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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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