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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2013
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,
| 2013 |  | 2012 |  | 2013 |  | 2012
Numerators: |  |  |  |  |  |  |
Numerator for both basic and diluted EPS, net income | $ | 52,097,397 |  |  | $ | 40,766,539 |  |  | $ | 97,527,964 |  |  | $ | 87,111,123 |
Denominators: |  |  |  |  |  |  |
Denominator for basic EPS, weighted-average shares outstanding | 143,240,333 |  |  | 143,722,329 |  |  | 142,888,337 |  |  | 143,610,898 |
Potentially dilutive shares resulting from stock plans | 770,292 |  |  | 1,019,028 |  |  | 649,655 |  |  | 1,243,334 |
Denominator for diluted EPS | 144,010,625 |  |  | 144,741,357 |  |  | 143,537,992 |  |  | 144,854,232 |
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive | 3,270,342 |  |  | 3,513,682 |  |  | 3,454,067 |  |  | 2,906,932 |

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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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