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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Abstract] |
Calculation of Weighted Average Common Shares Outstanding used in Computation of Diluted Earnings Per Share | The following table summarizes the calculation of weighted average common shares outstanding used in the computation of diluted earnings per share, for the years ended December 31 (in thousands):
| 2012 |  | 2011 |  | 2010
Weighted average basic common shares outstanding | 453,595 |  |  | 398,851 |  |  | 291,869 |
Effect of dilutive securities |  |  |  |  |
Restricted stock | 2,420 |  |  | 7,794 |  |  | 5,057 |
Convertible preferred stock | — |  |  | — |  |  | 18,423 |
Weighted average diluted common and potential common shares outstanding | 456,015 |  |  | 406,645 |  |  | 315,349 |

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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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