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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2012
Summary of Antidilutive Securities Outstanding were Not Included in Computation of Diluted EPS | The following table presents securities outstanding that could potentially dilute basic EPS in the future that were not included in the computation of diluted EPS because they were antidilutive for the three and nine month periods ended September 30, 2012 and 2011:
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Stock options |  |  | 0 |  |  |  | 1,718,735 |  |  |  | 846,185 |  |  |  | 1,742,167 |
Restricted stock units |  |  | 0 |  |  |  | 461,589 |  |  |  | 71,550 |  |  |  | 465,465 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + 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 (c) -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Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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