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Earnings Per Share | 3 Months Ended
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Mar. 31, 2014
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,
| 2014 |  | 2013
Numerators: |  |  |
Numerator for both basic and diluted EPS, net income | $ | 68,566,071 |  |  | $ | 45,430,567 |
Denominators: |  |  |
Denominator for basic EPS, weighted-average shares outstanding | 144,918,406 |  |  | 142,534,655 |
Potentially dilutive shares resulting from stock plans | 1,800,101 |  |  | 540,810 |
Denominator for diluted EPS | 146,718,507 |  |  | 143,075,465 |
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive | 594,415 |  |  | 5,034,165 |

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