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Per Share Data | 3 Months Ended
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Mar. 31, 2015
Earnings Per Share [Abstract] |
Per Share Data | 3. Per Share Data Basic earnings per share are computed using net income attributable to common shareholders and the weighted average number of common shares outstanding. Diluted earnings per share reflect common shares issuable from the assumed conversion of common share options and share awards granted and units convertible into common shares. Only those items having a dilutive impact on our basic earnings per share are included in diluted earnings per share. Our unvested share-based awards are considered participating securities and are reflected in the calculation of basic and diluted earnings per share using the two-class method. The number of common share equivalent securities excluded from the diluted earnings per share calculation was approximately 1.5 million and 2.1 million for the three months ended March 31, 2015 and 2014, respectively. These securities, which include common share options and share awards granted and units convertible into common shares, were excluded from the diluted earnings per share calculation as they are anti-dilutive. The following table presents information necessary to calculate basic and diluted earnings per share for the periods indicated:
|  | Three Months Ended
|  | March 31,
(in thousands, except per share amounts) |  | 2015 |  | 2014
Earnings per common share calculation – basic |  |  |  |
Net income attributable to common shareholders |  | $ | 115,599 |  |  | $ | 40,036 |
Amount allocated to participating securities |  | (1,052 | ) |  | (352 | )
Net income attributable to common shareholders – basic |  | $ | 114,547 |  |  | $ | 39,684 |
Earnings per common share – basic |  | $ | 1.29 |  |  | $ | 0.45 |
Weighted average number of common shares outstanding – basic |  | 88,987 |  |  | 87,651 |
Earnings per common share calculation – diluted |  |  |  |
Net income attributable to common shareholders, net of amount allocated to participating securities |  | $ | 114,547 |  |  | $ | 39,684 |
Income allocated to common units from continuing operations |  | 766 |  |  | 310 |
Net income attributable to common shareholders – diluted |  | $ | 115,313 |  |  | $ | 39,994 |
Earnings per common share – diluted |  | $ | 1.27 |  |  | $ | 0.45 |
Weighted average number of common shares outstanding – basic |  | 88,987 |  |  | 87,651 |
Incremental shares issuable from assumed conversion of: |  |  |  |
Common share options and share awards granted |  | 391 |  |  | 360 |
Common units |  | 1,086 |  |  | 813 |
Weighted average number of common shares outstanding – diluted |  | 90,464 |  |  | 88,824 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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