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Earnings Per Share | 3 Months Ended
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Mar. 31, 2016
Earnings Per Share [Abstract] |
Earnings Per Share And Earnings Per Unit [Text Block] | 10. Earning Per Share and Earnings Per Unit Equity Residential The following tables set forth the computation of net income per share – basic and net income per share – diluted for the Company (amounts in thousands except per share amounts):
|  | Quarter Ended March 31,
|  | 2016 |  | 2015
Numerator for net income per share – basic: |  |  |  |
Income from continuing operations |  | $ | 3,731,988 |  |  | $ | 190,069 |
Allocation to Noncontrolling Interests – Operating Partnership, net |  | (143,315 | ) |  | (7,053 | )
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties |  | (764 | ) |  | (643 | )
Preferred distributions |  | (773 | ) |  | (891 | )
Premium on redemption of Preferred Shares |  | — |  |  | (2,789 | )
Income from continuing operations available to Common Shares, net of Noncontrolling Interests |  | 3,587,136 |  |  | 178,693 |
Discontinued operations, net of Noncontrolling Interests |  | (151 | ) |  | 149 |
Numerator for net income per share – basic |  | $ | 3,586,985 |  |  | $ | 178,842 |
Numerator for net income per share – diluted: |  |  |  |
Income from continuing operations |  | $ | 3,731,988 |  |  | $ | 190,069 |
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties |  | (764 | ) |  | (643 | )
Preferred distributions |  | (773 | ) |  | (891 | )
Premium on redemption of Preferred Shares |  | — |  |  | (2,789 | )
Income from continuing operations available to Common Shares |  | 3,730,451 |  |  | 185,746 |
Discontinued operations, net |  | (157 | ) |  | 155 |
Numerator for net income per share – diluted |  | $ | 3,730,294 |  |  | $ | 185,901 |
Denominator for net income per share – basic and diluted: |  |  |  |
Denominator for net income per share – basic |  | 364,592 |  |  | 363,098 |
Effect of dilutive securities: |  |  |  |
OP Units |  | 13,697 |  |  | 13,598 |
Long-term compensation shares/units |  | 3,954 |  |  | 3,631 |
Denominator for net income per share – diluted |  | 382,243 |  |  | 380,327 |
Net income per share – basic |  | $ | 9.84 |  |  | $ | 0.49 |
Net income per share – diluted |  | $ | 9.76 |  |  | $ | 0.49 |
Net income per share – basic: |  |  |  |
Income from continuing operations available to Common Shares, net of Noncontrolling Interests |  | $ | 9.84 |  |  | $ | 0.49 |
Discontinued operations, net of Noncontrolling Interests |  | — |  |  | — |
Net income per share – basic |  | $ | 9.84 |  |  | $ | 0.49 |
Net income per share – diluted: |  |  |  |
Income from continuing operations available to Common Shares |  | $ | 9.76 |  |  | $ | 0.49 |
Discontinued operations, net |  | — |  |  | — |
Net income per share – diluted |  | $ | 9.76 |  |  | $ | 0.49 |
ERP Operating Limited Partnership The following tables set forth the computation of net income per Unit – basic and net income per Unit – diluted for the Operating Partnership (amounts in thousands except per Unit amounts):
|  | Quarter Ended March 31,
|  | 2016 |  | 2015
Numerator for net income per Unit – basic and diluted: |  |  |  |
Income from continuing operations |  | $ | 3,731,988 |  |  | $ | 190,069 |
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties |  | (764 | ) |  | (643 | )
Allocation to Preference Units |  | (773 | ) |  | (891 | )
Allocation to premium on redemption of Preference Units |  | — |  |  | (2,789 | )
Income from continuing operations available to Units |  | 3,730,451 |  |  | 185,746 |
Discontinued operations, net |  | (157 | ) |  | 155 |
Numerator for net income per Unit – basic and diluted |  | $ | 3,730,294 |  |  | $ | 185,901 |
Denominator for net income per Unit – basic and diluted: |  |  |  |
Denominator for net income per Unit – basic |  | 378,289 |  |  | 376,696 |
Effect of dilutive securities: |  |  |  |
Dilution for Units issuable upon assumed exercise/vesting of the Company’s long-term compensation shares/units |  | 3,954 |  |  | 3,631 |
Denominator for net income per Unit – diluted |  | 382,243 |  |  | 380,327 |
Net income per Unit – basic |  | $ | 9.84 |  |  | $ | 0.49 |
Net income per Unit – diluted |  | $ | 9.76 |  |  | $ | 0.49 |
Net income per Unit – basic: |  |  |  |
Income from continuing operations available to Units |  | $ | 9.84 |  |  | $ | 0.49 |
Discontinued operations, net |  | — |  |  | — |
Net income per Unit – basic |  | $ | 9.84 |  |  | $ | 0.49 |
Net income per Unit – diluted: |  |  |  |
Income from continuing operations available to Units |  | $ | 9.76 |  |  | $ | 0.49 |
Discontinued operations, net |  | — |  |  | — |
Net income per Unit – diluted |  | $ | 9.76 |  |  | $ | 0.49 |

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