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Per Share Data (Tables) | 12 Months Ended
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Dec. 31, 2017
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:
|  | Year Ended December 31,
(in thousands, except per share amounts) |  | 2017 |  | 2016 |  | 2015
Earnings per common share calculation – basic |  |  |  |  |  |
Income from continuing operations attributable to common shareholders |  | $ | 196,422 |  |  | $ | 436,981 |  |  | $ | 229,565 |
Amount allocated to participating securities |  | (660 | ) |  | (6,304 | ) |  | (2,052 | )
Income from continuing operations attributable to common shareholders, net of amount allocated to participating securities |  | $ | 195,762 |  |  | $ | 430,677 |  |  | $ | 227,513 |
Discontinued operations, including gain on sale, attributable to common shareholders |  | — |  |  | 382,842 |  |  | 19,750 |
Net income attributable to common shareholders – basic |  | $ | 195,762 |  |  | $ | 813,519 |  |  | $ | 247,263 |
Earnings per common share from continuing operations |  | $ | 2.14 |  |  | $ | 4.81 |  |  | $ | 2.55 |
Earnings per common share from discontinued operations |  | — |  |  | 4.27 |  |  | 0.22 |
Total earnings per common share – basic |  | $ | 2.14 |  |  | $ | 9.08 |  |  | $ | 2.77 |
Weighted average number of common shares outstanding – basic |  | 91,499 |  |  | 89,580 |  |  | 89,120 |
Earnings per common share calculation – diluted |  |  |  |  |  |
Income from continuing operations attributable to common shareholders, net of amount allocated to participating securities |  | $ | 195,762 |  |  | $ | 430,677 |  |  | $ | 227,513 |
Income allocated to common units from continuing operations |  | 1,174 |  |  | — |  |  | — |
Income from continuing operations attributable to common shareholders, as adjusted |  | $ | 196,936 |  |  | $ | 430,677 |  |  | $ | 227,513 |
Discontinued operations, including gain on sale, attributable to common shareholders |  | — |  |  | 382,842 |  |  | 19,750 |
Net income attributable to common shareholders – diluted |  | $ | 196,936 |  |  | $ | 813,519 |  |  | $ | 247,263 |
Earnings per common share from continuing operations |  | $ | 2.13 |  |  | $ | 4.79 |  |  | $ | 2.54 |
Earnings per common share from discontinued operations |  | — |  |  | 4.26 |  |  | 0.22 |
Total earnings per common share – diluted |  | $ | 2.13 |  |  | $ | 9.05 |  |  | $ | 2.76 |
Weighted average number of common shares outstanding – basic |  | 91,499 |  |  | 89,580 |  |  | 89,120 |
Incremental shares issuable from assumed conversion of: |  |  |  |  |  |
Common share options and share awards granted |  | 211 |  |  | 323 |  |  | 370 |
Common units |  | 805 |  |  | — |  |  | — |
Weighted average number of common shares outstanding – diluted |  | 92,515 |  |  | 89,903 |  |  | 89,490 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + 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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