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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2012
Earnings Per Share [Abstract] |
Schedule Of Earnings Per Share Basic And Diluted |
| Three Months Ended June 30, |  | Six Months Ended June 30,
Numerators: | 2012 | 2011 |  | 2012 | 2011
Numerator for both basic and diluted EPS, net income | $ | 40,766,539 | $ | 38,472,169 |  | $ | 87,111,123 | $ | 80,805,051
Denominators: |  |  |  |  |  |  |  |  |
Denominator for basic EPS, weighted-average shares outstanding |  | 143,722,329 |  | 142,279,210 |  |  | 143,610,898 |  | 142,071,203
Potentially dilutive shares resulting from stock plans |  | 1,019,028 |  | 1,917,784 |  |  | 1,243,334 |  | 1,992,412
Denominator for diluted EPS |  | 144,741,357 |  | 144,196,994 |  |  | 144,854,232 |  | 144,063,615
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive |  | 3,513,682 |  | 1,078,512 |  |  | 2,906,932 |  | 307,231

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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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