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Basis of Consolidation and Presentation (Tables) | 6 Months Ended
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Jun. 30, 2012
Calculation of Income Per Share From Continuing and Discontinued Operations | The following table presents information necessary to calculate income from continuing operations per share, loss from discontinued operations per share and net income per share for the three and six months ended June 30, 2012 and 2011 as well as potentially dilutive securities excluded from the weighted average number of diluted common shares outstanding, as their inclusion would have been anti-dilutive (in thousands, except per share amounts):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
BASIC EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  | $ | 92,538 |  |  | $ | 81,638 |  |  | $ | 189,812 |  |  | $ | 153,257 |
Adjust for income attributed to holders of non-vested restricted stock |  |  | (806 | ) |  |  | (648 | ) |  |  | (1,550 | ) |  |  | (1,145 | )
Income from continuing operations attributed to common stockholders |  | $ | 91,732 |  |  | $ | 80,990 |  |  | $ | 188,262 |  |  | $ | 152,112 |
Loss from discontinued operations, net |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (367 | )
Adjust for loss attributed to holders of non-vested restricted stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3 |
Loss from discontinued operations attributed to common stockholders |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (364 | )
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock |  |  | 153,269 |  |  |  | 153,556 |  |  |  | 153,947 |  |  |  | 153,340 |
Basic income from continuing operations per common share |  | $ | 0.60 |  |  | $ | 0.53 |  |  | $ | 1.22 |  |  | $ | 0.99 |
Basic loss from discontinued operations per common share |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |
Basic net income per common share |  | $ | 0.60 |  |  | $ | 0.53 |  |  | $ | 1.22 |  |  | $ | 0.99 |
DILUTED EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations attributed to common stockholders |  | $ | 91,732 |  |  | $ | 80,990 |  |  | $ | 188,262 |  |  | $ | 152,112 |
Add incremental earnings related to potential common shares |  |  | — |  |  |  | 8 |  |  |  | — |  |  |  | — |
Adjusted income from continuing operations attributed to common stockholders |  | $ | 91,732 |  |  | $ | 80,998 |  |  | $ | 188,262 |  |  | $ | 152,112 |
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock |  |  | 153,269 |  |  |  | 153,556 |  |  |  | 153,947 |  |  |  | 153,340 |
Add dilutive effect of potential common shares |  |  | 386 |  |  |  | 2,025 |  |  |  | 597 |  |  |  | 1,912 |
Weighted average number of diluted common shares outstanding |  |  | 153,655 |  |  |  | 155,581 |  |  |  | 154,544 |  |  |  | 155,252 |
Diluted income from continuing operations per common share |  | $ | 0.60 |  |  | $ | 0.52 |  |  | $ | 1.22 |  |  | $ | 0.98 |
Diluted loss from discontinued operations per common share |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |
Diluted net income per common share |  | $ | 0.60 |  |  | $ | 0.52 |  |  | $ | 1.22 |  |  | $ | 0.98 |
Potentially dilutive securities excluded as anti-dilutive |  |  | 5,969 |  |  |  | 380 |  |  |  | 5,529 |  |  |  | 1,796 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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