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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2013
Earnings Per Share [Abstract] |
Reconciliation of the average shares outstanding used to compute basic and diluted earnings per share | The following is a reconciliation of the average shares outstanding used to compute basic and diluted earnings per share.
| Three Months Ended March 31,
| 2013 |  | 2012
Basic weighted average common shares outstanding | 132,306,735 |  |  | 130,550,681 |
Effect of dilutive securities | 2,686,322 |  |  | 3,131,095 |
Diluted weighted average common shares outstanding | 134,993,057 |  |  | 133,681,776 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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