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Organization, Basis of Presentation and Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2017
Accounting Policies [Abstract] |
Schedule of earnings per common share | The Company's earnings per common share are determined as follows (dollars in thousands, except per share data):
| For the three months ended |  | For the nine months ended
| 9/30/2017 |  | 9/30/2016 |  | 9/30/2017 |  | 9/30/2016
Basic and diluted shares outstanding |  |  |  |  |  |  |  |  |
Weighted average common shares - basic | 137,715,192 |  |  | 136,997,756 |  |  | 137,457,293 |  |  | 136,901,164 |
Weighted average DownREIT units outstanding | 7,500 |  |  | 7,500 |  |  | 7,500 |  |  | 7,500 |
Effect of dilutive securities | 584,354 |  |  | 499,798 |  |  | 541,399 |  |  | 533,642 |
Weighted average common shares - diluted | 138,307,046 |  |  | 137,505,054 |  |  | 138,006,192 |  |  | 137,442,306 |
Calculation of Earnings per Share - basic |  |  |  |  |  |  |  |  |
Net income attributable to common stockholders | $ | 238,248 |  |  | $ | 356,392 |  |  | $ | 639,348 |  |  | $ | 791,767 |
Net income allocated to unvested restricted shares | (672 | ) |  | (872 | ) |  | (1,794 | ) |  | (2,036 | )
Net income attributable to common stockholders, adjusted | $ | 237,576 |  |  | $ | 355,520 |  |  | $ | 637,554 |  |  | $ | 789,731 |
Weighted average common shares - basic | 137,715,192 |  |  | 136,997,756 |  |  | 137,457,293 |  |  | 136,901,164 |
Earnings per common share - basic | $ | 1.73 |  |  | $ | 2.60 |  |  | $ | 4.64 |  |  | $ | 5.77 |
Calculation of Earnings per Share - diluted |  |  |  |  |  |  |  |  |
Net income attributable to common stockholders | $ | 238,248 |  |  | $ | 356,392 |  |  | $ | 639,348 |  |  | $ | 791,767 |
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships | 11 |  |  | 10 |  |  | 32 |  |  | 30 |
Adjusted net income attributable to common stockholders | $ | 238,259 |  |  | $ | 356,402 |  |  | $ | 639,380 |  |  | $ | 791,797 |
Weighted average common shares - diluted | 138,307,046 |  |  | 137,505,054 |  |  | 138,006,192 |  |  | 137,442,306 |
Earnings per common share - diluted | $ | 1.72 |  |  | $ | 2.59 |  |  | $ | 4.63 |  |  | $ | 5.76 |

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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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