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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 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 September 30, |  | Nine months ended September 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Numerators: |  |  |  |  |  |  |
Numerator for both basic and diluted EPS, net income | $ | 55,520,961 |  |  | $ | 41,877,083 |  |  | $ | 153,048,925 |  |  | $ | 128,988,206 |
Denominators: |  |  |  |  |  |  |
Denominator for basic EPS, weighted-average shares outstanding | 143,697,760 |  |  | 143,027,693 |  |  | 143,160,402 |  |  | 143,415,077 |
Potentially dilutive shares resulting from stock plans | 821,140 |  |  | 556,682 |  |  | 655,639 |  |  | 1,002,142 |
Denominator for diluted EPS | 144,518,900 |  |  | 143,584,375 |  |  | 143,816,041 |  |  | 144,417,219 |
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive | 3,220,980 |  |  | 5,332,661 |  |  | 3,573,418 |  |  | 3,289,832 |

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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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