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Per Share Data (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Calculation Of Basic And Diluted Earnings Per Share | The following table presents information necessary to calculate basic and diluted earnings per share for the periods indicated:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
(in thousands, except per share amounts) | 2013 |  | 2012 |  | 2013 |  | 2012
Earnings per share calculation – basic |  |  |  |  |  |  |
Income from continuing operations attributable to common shareholders | $ | 48,956 |  |  | $ | 19,083 |  |  | $ | 79,941 |  |  | $ | 73,041 |
Amount allocated to participating securities | (696 | ) |  | (210 | ) |  | (1,335 | ) |  | (1,099 | )
Income from continuing operations attributable to common shareholders, net of amount allocated to participating securities | 48,260 |  |  | 18,873 |  |  | 78,606 |  |  | 71,942 |
Income from discontinued operations, including gain on sale, attributable to common shareholders | 23,216 |  |  | 2,680 |  |  | 55,707 |  |  | 37,480 |
Net income attributable to common shareholders, as adjusted | $ | 71,476 |  |  | $ | 21,553 |  |  | $ | 134,313 |  |  | $ | 109,422 |
Income from continuing operations attributable to common shareholders, as adjusted – per share | $ | 0.55 |  |  | $ | 0.23 |  |  | $ | 0.90 |  |  | $ | 0.88 |
Income from discontinued operations, including gain on sale, attributable to common shareholders – per share | 0.27 |  |  | 0.03 |  |  | 0.64 |  |  | 0.46 |
Net income attributable to common shareholders, as adjusted – per share | $ | 0.82 |  |  | $ | 0.26 |  |  | $ | 1.54 |  |  | $ | 1.34 |
Weighted average number of common shares outstanding – basic | 87,191 |  |  | 83,223 |  |  | 86,949 |  |  | 81,554 |
Earnings per share calculation – diluted |  |  |  |  |  |  |
Income from continuing operations attributable to common shareholders, net of amount allocated to participating securities | $ | 48,260 |  |  | $ | 18,873 |  |  | $ | 78,606 |  |  | $ | 71,942 |
Income allocated to common units from continuing operations | 315 |  |  | — |  |  | 645 |  |  | 572 |
Income from continuing operations attributable to common shareholders, as adjusted | 48,575 |  |  | 18,873 |  |  | 79,251 |  |  | 72,514 |
Income from discontinued operations, including gain on sale, attributable to common shareholders | 23,216 |  |  | 2,680 |  |  | 55,707 |  |  | 37,480 |
Income from discontinued operations allocated to common units | — |  |  | — |  |  | — |  |  | 784 |
Net income attributable to common shareholders, as adjusted | $ | 71,791 |  |  | $ | 21,553 |  |  | $ | 134,958 |  |  | $ | 110,778 |
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
(in thousands, except per share amounts) | 2013 |  | 2012 |  | 2013 |  | 2012
Earnings per share calculation – diluted (continued) |  |  |  |  |  |  |
Income from continuing operations attributable to common shareholders, as adjusted – per share | $ | 0.55 |  |  | $ | 0.23 |  |  | $ | 0.90 |  |  | $ | 0.87 |
Income from discontinued operations, including gain on sale, attributable to common shareholders – per share | 0.26 |  |  | 0.03 |  |  | 0.63 |  |  | 0.46 |
Net income attributable to common shareholders, as adjusted – per share | $ | 0.81 |  |  | $ | 0.26 |  |  | $ | 1.53 |  |  | $ | 1.33 |
Weighted average number of common shares outstanding – basic | 87,191 |  |  | 83,223 |  |  | 86,949 |  |  | 81,554 |
Incremental shares issuable from assumed conversion of: |  |  |  |  |  |  |
Common share options and share awards granted | 467 |  |  | 623 |  |  | 519 |  |  | 652 |
Common units | 814 |  |  | — |  |  | 815 |  |  | 1,127 |
Weighted average number of common shares outstanding – diluted | 88,472 |  |  | 83,846 |  |  | 88,283 |  |  | 83,333 |

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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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