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Equity, Capital and Other Interests (Tables) | 6 Months Ended
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Jun. 30, 2015
Common shares and units rollforward | The following tables present the changes in the Company’s issued and outstanding Common Shares and “Units” (which includes OP Units and restricted units (formerly known as Long-Term Incentive Plan (“LTIP”) Units)) for the six months ended June 30, 2015:
|  | 2015
Common Shares |  |
Common Shares outstanding at January 1, |  | 362,855,454 |
Common Shares Issued: |  |
Conversion of OP Units |  | 171,353 |
Exercise of share options |  | 814,827 |
Employee Share Purchase Plan (ESPP) |  | 40,873 |
Restricted share grants, net |  | 169,667 |
Common Shares Other: |  |
Conversion of restricted shares to restricted units |  | (1,284 | )
Common Shares outstanding at June 30, |  | 364,050,890 |
Units |  |
Units outstanding at January 1, |  | 14,298,691 |
Restricted units, net |  | 337,505 |
Conversion of restricted shares to restricted units |  | 1,284 |
Conversion of OP Units to Common Shares |  | (171,353 | )
Units outstanding at June 30, |  | 14,466,127 |
Total Common Shares and Units outstanding at June 30, |  | 378,517,017 |
Units Ownership Interest in Operating Partnership |  | 3.8 | %
Redeemable Noncontrolling Interest [Table Text Block] | The following table presents the changes in the redemption value of the Redeemable Noncontrolling Interests – Operating Partnership for the six months ended June 30, 2015 (amounts in thousands):
|  | 2015
Balance at January 1, |  | $ | 500,733 |
Change in market value |  | (13,966 | )
Change in carrying value |  | 1,411 |
Balance at June 30, |  | $ | 488,178 |
Schedule Of Preferred Stock [Table Text Block] | The following table presents the Company’s issued and outstanding Preferred Shares as of June 30, 2015 and December 31, 2014:
|  |  |  |  |  | Amounts in thousands
|  | Redemption Date (1) |  | Annual Dividend per Share (2) |  | June 30, 2015 |  | December 31, 2014
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized: |  |  |  |  |  |  |  |
8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 803,600 shares issued and outstanding at June 30, 2015 and 1,000,000 shares issued and outstanding at December 31, 2014 (3) |  | 12/10/26 |  |  | $4.145 |  |  | $ | 40,180 |  |  | $ | 50,000 |
|  |  |  |  |  | $ | 40,180 |  |  | $ | 50,000 |
(1) | On or after the redemption date, redeemable preferred shares may be redeemed for cash at the option of the Company, in whole or
in part, at a redemption price equal to the liquidation price per share, plus accrued and unpaid distributions, if any.
(2) | Dividends on Preferred Shares are payable quarterly.
(3) | Effective January 26, 2015, the Company repurchased and retired 196,400 Series K Preferred Shares with a par value of $9.82 million for total cash consideration of approximately $12.7 million. As a result of this partial redemption, the Company incurred a cash charge of approximately $2.8 million which was recorded as a premium on the redemption of Preferred Shares.
Limited Partner [Member] |
Redeemable Noncontrolling Interest [Table Text Block] | The following table presents the changes in the redemption value of the Redeemable Limited Partners for the six months ended June 30, 2015 (amounts in thousands):
|  | 2015
Balance at January 1, |  | $ | 500,733 |
Change in market value |  | (13,966 | )
Change in carrying value |  | 1,411 |
Balance at June 30, |  | $ | 488,178 |
Schedule Of Preferred Stock [Table Text Block] | The following table presents the Operating Partnership’s issued and outstanding “Preference Units” as of June 30, 2015 and December 31, 2014:
|  |  |  |  |  | Amounts in thousands
|  | Redemption Date (1) |  | Annual Dividend per Unit (2) |  | June 30, 2015 |  | December 31, 2014
Preference Units: |  |  |  |  |  |  |  |
8.29% Series K Cumulative Redeemable Preference Units; liquidation value $50 per unit; 803,600 units issued and outstanding at June 30, 2015 and 1,000,000 units issued and outstanding at December 31, 2014 (3) |  | 12/10/26 |  |  | $4.145 |  |  | $ | 40,180 |  |  | $ | 50,000 |
|  |  |  |  |  | $ | 40,180 |  |  | $ | 50,000 |
(1) | On or after the redemption date, redeemable preference units may be redeemed for cash at the option of the Operating Partnership, in whole or in part, at a redemption price equal to the liquidation price per unit, plus accrued and unpaid distributions, if any, in conjunction with the concurrent redemption of the corresponding Company Preferred Shares.
(2) | Dividends on Preference Units are payable quarterly.
(3) | Effective January 26, 2015, the Operating Partnership repurchased and retired 196,400 Series K Preference Units with a par value of $9.82 million for total cash consideration of approximately $12.7 million, in conjunction with the concurrent redemption of the corresponding Company Preferred Shares. As a result of this partial redemption, the Operating Partnership incurred a cash charge of approximately $2.8 million which was recorded as a premium on the redemption of Preference Units.
Limited Partner [Member] |
Common shares and units rollforward | The following tables present the changes in the Operating Partnership’s issued and outstanding Units and in the limited partners’ Units for the six months ended June 30, 2015:
|  | 2015
General and Limited Partner Units |  |
General and Limited Partner Units outstanding at January 1, |  | 377,154,145 |
Issued to General Partner: |  |
Exercise of EQR share options |  | 814,827 |
EQR’s Employee Share Purchase Plan (ESPP) |  | 40,873 |
EQR's restricted share grants, net |  | 169,667 |
Issued to Limited Partners: |  |
Restricted units, net |  | 337,505 |
General and Limited Partner Units outstanding at June 30, |  | 378,517,017 |
Limited Partner Units |  |
Limited Partner Units outstanding at January 1, |  | 14,298,691 |
Limited Partner restricted units, net |  | 337,505 |
Conversion of EQR restricted shares to restricted units |  | 1,284 |
Conversion of Limited Partner OP Units to EQR Common Shares |  | (171,353 | )
Limited Partner Units outstanding at June 30, |  | 14,466,127 |
Limited Partner Units Ownership Interest in Operating Partnership |  | 3.8 | %

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