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Earnings Per Share | 6 Months Ended
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Jun. 30, 2016
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 June 30, |  | Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Numerators: |  |  |  |  |  |  |
Numerator for both basic and diluted EPS, net income | $ | 86,485,242 |  |  | $ | 74,558,437 |  |  | $ | 166,765,236 |  |  | $ | 151,741,878 |
Denominators: |  |  |  |  |  |  |
Denominator for basic EPS, weighted-average shares outstanding | 288,803,045 |  |  | 293,958,258 |  |  | 288,943,030 |  |  | 294,461,499 |
Potentially dilutive shares resulting from stock plans | 2,660,838 |  |  | 3,503,844 |  |  | 2,429,695 |  |  | 3,528,533 |
Denominator for diluted EPS | 291,463,883 |  |  | 297,462,102 |  |  | 291,372,725 |  |  | 297,990,032 |
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive | 4,330,316 |  |  | 1,804,157 |  |  | 6,563,404 |  |  | 1,496,107 |

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