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Earnings Per Share | 9 Months Ended
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Sep. 30, 2013
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 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 The entire disclosure for earnings per share. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 + Details
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