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Earnings Per Share | 9 Months Ended
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Sep. 30, 2014
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):
|  | Nine Months Ended September 30, |  | Quarter Ended September 30,
|  | 2014 |  | 2013 |  | 2014 |  | 2013
Numerator for net income per share – basic: |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  | $ | 301,598 |  |  | $ | (237,315 | ) |  | $ | 117,611 |  |  | $ | (13,465 | )
Allocation to Noncontrolling Interests – Operating Partnership, net |  | (16,216 | ) |  | 9,517 |  |  | (8,740 | ) |  | 521 |
Net gain on sales of real estate properties |  | 128,544 |  |  | — |  |  | 113,641 |  |  | — |
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties |  | (1,800 | ) |  | 1,101 |  |  | (708 | ) |  | 311 |
Preferred distributions |  | (3,109 | ) |  | (3,109 | ) |  | (1,037 | ) |  | (1,037 | )
Income (loss) from continuing operations available to Common Shares, net of Noncontrolling Interests |  | 409,017 |  |  | (229,806 | ) |  | 220,767 |  |  | (13,670 | )
Discontinued operations, net of Noncontrolling Interests |  | 1,443 |  |  | 1,946,334 |  |  | (60 | ) |  | 389,825 |
Numerator for net income per share – basic |  | $ | 410,460 |  |  | $ | 1,716,528 |  |  | $ | 220,707 |  |  | $ | 376,155 |
Numerator for net income per share – diluted (1): |  |  |  |  |  |  |  |
Income from continuing operations |  | $ | 301,598 |  |  |  |  |  | $ | 117,611 |  |  |
Net gain on sales of real estate properties |  | 128,544 |  |  |  |  | 113,641 |  |  |
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties |  | (1,800 | ) |  |  |  |  | (708 | ) |  |
Preferred distributions |  | (3,109 | ) |  |  |  |  | (1,037 | ) |  |
Income from continuing operations available to Common Shares |  | 425,233 |  |  |  |  |  | 229,507 |  |  |
Discontinued operations, net |  | 1,500 |  |  |  |  |  | (62 | ) |  |
Numerator for net income per share – diluted (1) |  | $ | 426,733 |  |  | $ | 1,716,528 |  |  | $ | 229,445 |  |  | $ | 376,155 |
Denominator for net income per share – basic and diluted (1): |  |  |  |  |  |  |  |
Denominator for net income per share – basic |  | 360,900 |  |  | 352,414 |  |  | 361,409 |  |  | 359,811 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
OP Units |  | 13,726 |  |  |  |  | 13,707 |  |  |
Long-term compensation shares/units |  | 2,602 |  |  |  |  | 2,838 |  |  |
Denominator for net income per share – diluted (1) |  | 377,228 |  |  | 352,414 |  |  | 377,954 |  |  | 359,811 |
Net income per share – basic |  | $ | 1.14 |  |  | $ | 4.87 |  |  | $ | 0.61 |  |  | $ | 1.05 |
Net income per share – diluted |  | $ | 1.13 |  |  | $ | 4.87 |  |  | $ | 0.61 |  |  | $ | 1.05 |
Net income per share – basic: |  |  |  |  |  |  |  |
Income (loss) from continuing operations available to Common Shares, net of Noncontrolling Interests |  | $ | 1.133 |  |  | $ | (0.652 | ) |  | $ | 0.611 |  |  | $ | (0.038 | )
Discontinued operations, net of Noncontrolling Interests |  | 0.004 |  |  | 5.523 |  |  | — |  |  | 1.083 |
Net income per share – basic |  | $ | 1.137 |  |  | $ | 4.871 |  |  | $ | 0.611 |  |  | $ | 1.045 |
Net income per share – diluted (1): |  |  |  |  |  |  |  |
Income (loss) from continuing operations available to Common Shares |  | $ | 1.127 |  |  | $ | (0.652 | ) |  | $ | 0.607 |  |  | $ | (0.038 | )
Discontinued operations, net |  | 0.004 |  |  | 5.523 |  |  | — |  |  | 1.083 |
Net income per share – diluted |  | $ | 1.131 |  |  | $ | 4.871 |  |  | $ | 0.607 |  |  | $ | 1.045 |
(1) | Potential common shares issuable from the assumed conversion of OP Units and the exercise/vesting of long-term compensation shares/units are automatically anti-dilutive and therefore excluded from the diluted earnings per share calculation as the Company had a loss from continuing operations for the nine months and quarter ended September 30, 2013.
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):
|  | Nine Months Ended September 30, |  | Quarter Ended September 30,
|  | 2014 |  | 2013 |  | 2014 |  | 2013
Numerator for net income per Unit – basic and diluted (1): |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  | $ | 301,598 |  |  | $ | (237,315 | ) |  | $ | 117,611 |  |  | $ | (13,465 | )
Net gain on sales of real estate properties |  | 128,544 |  |  | — |  |  | 113,641 |  |  | — |
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties |  | (1,800 | ) |  | 1,101 |  |  | (708 | ) |  | 311 |
Allocation to Preference Units |  | (3,109 | ) |  | (3,109 | ) |  | (1,037 | ) |  | (1,037 | )
Income (loss) from continuing operations available to Units |  | 425,233 |  |  | (239,323 | ) |  | 229,507 |  |  | (14,191 | )
Discontinued operations, net |  | 1,500 |  |  | 2,026,798 |  |  | (62 | ) |  | 405,182 |
Numerator for net income per Unit – basic and diluted (1) |  | $ | 426,733 |  |  | $ | 1,787,475 |  |  | $ | 229,445 |  |  | $ | 390,991 |
Denominator for net income per Unit – basic and diluted (1): |  |  |  |  |  |  |  |
Denominator for net income per Unit – basic |  | 374,626 |  |  | 366,150 |  |  | 375,116 |  |  | 373,547 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Dilution for Units issuable upon assumed exercise/vesting of the Company’s long-term compensation shares/units |  | 2,602 |  |  |  |  | 2,838 |  |  |
Denominator for net income per Unit – diluted (1) |  | 377,228 |  |  | 366,150 |  |  | 377,954 |  |  | 373,547 |
Net income per Unit – basic |  | $ | 1.14 |  |  | $ | 4.87 |  |  | $ | 0.61 |  |  | $ | 1.05 |
Net income per Unit – diluted |  | $ | 1.13 |  |  | $ | 4.87 |  |  | $ | 0.61 |  |  | $ | 1.05 |
Net income per Unit – basic: |  |  |  |  |  |  |  |
Income (loss) from continuing operations available to Units |  | $ | 1.133 |  |  | $ | (0.652 | ) |  | $ | 0.611 |  |  | $ | (0.038 | )
Discontinued operations, net |  | 0.004 |  |  | 5.523 |  |  | — |  |  | 1.083 |
Net income per Unit – basic |  | $ | 1.137 |  |  | $ | 4.871 |  |  | $ | 0.611 |  |  | $ | 1.045 |
Net income per Unit – diluted (1): |  |  |  |  |  |  |  |
Income (loss) from continuing operations available to Units |  | $ | 1.127 |  |  | $ | (0.652 | ) |  | $ | 0.607 |  |  | $ | (0.038 | )
Discontinued operations, net |  | 0.004 |  |  | 5.523 |  |  | — |  |  | 1.083 |
Net income per Unit – diluted |  | $ | 1.131 |  |  | $ | 4.871 |  |  | $ | 0.607 |  |  | $ | 1.045 |
(1) | Potential Units issuable from the assumed exercise/vesting of the Company's long-term compensation shares/units are automatically anti-dilutive and therefore excluded from the diluted earnings per Unit calculation as the Operating Partnership had a loss from continuing operations for the nine months and quarter ended September 30, 2013.

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- Definition The entire disclosure relating to earnings per share of the parent company and earnings per unit of the operating partnership. + References No definition available. + Details
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