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Per Share Data (Tables) | 6 Months Ended
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Jun. 30, 2015
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 June 30, |  | Six Months Ended June 30,
(in thousands, except per share amounts) |  | 2015 |  | 2014 |  | 2015 |  | 2014
Earnings per common share calculation – basic |  |  |  |  |  |  |  |
Net income attributable to common shareholders |  | $ | 36,079 |  |  | $ | 35,272 |  |  | $ | 151,678 |  |  | $ | 75,308 |
Amount allocated to participating securities |  | (251 | ) |  | (300 | ) |  | (1,302 | ) |  | (653 | )
Net income attributable to common shareholders – basic |  | $ | 35,828 |  |  | $ | 34,972 |  |  | $ | 150,376 |  |  | $ | 74,655 |
Earnings per common share – basic |  | $ | 0.40 |  |  | $ | 0.40 |  |  | $ | 1.69 |  |  | $ | 0.85 |
Weighted average number of common shares outstanding – basic |  | 89,153 |  |  | 87,845 |  |  | 89,071 |  |  | 87,748 |
Earnings per common share calculation – diluted |  |  |  |  |  |  |  |
Net income attributable to common shareholders – basic |  | $ | 35,828 |  |  | $ | 34,972 |  |  | $ | 150,376 |  |  | $ | 74,655 |
Income allocated to common units |  | 274 |  |  | 314 |  |  | 1,615 |  |  | 623 |
Net income attributable to common shareholders – diluted |  | $ | 36,102 |  |  | $ | 35,286 |  |  | $ | 151,991 |  |  | $ | 75,278 |
Earnings per common share – diluted |  | $ | 0.40 |  |  | $ | 0.40 |  |  | $ | 1.68 |  |  | $ | 0.85 |
Weighted average number of common shares outstanding – basic |  | 89,153 |  |  | 87,845 |  |  | 89,071 |  |  | 87,748 |
Incremental shares issuable from assumed conversion of: |  |  |  |  |  |  |  |
Common share options and share awards granted |  | 288 |  |  | 314 |  |  | 339 |  |  | 338 |
Common units |  | 811 |  |  | 813 |  |  | 1,086 |  |  | 813 |
Weighted average number of common shares outstanding – diluted |  | 90,252 |  |  | 88,972 |  |  | 90,496 |  |  | 88,899 |

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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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