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Equity, Capital and Other Interests (Tables) | 6 Months Ended
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Jun. 30, 2014
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, 2014 (amounts in thousands):
|  | 2014
Balance at January 1, |  | $ | 363,144 |
Change in market value |  | 80,615 |
Change in carrying value |  | (3,709 | )
Balance at June 30, |  | $ | 440,050 |
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 Long-Term Incentive Plan (“LTIP”) Units) for the six months ended June 30, 2014:
|  | 2014
Common Shares |  |
Common Shares outstanding at January 1, |  | 360,479,260 |
Common Shares Issued: |  |
Conversion of OP Units |  | 56,536 |
Exercise of share options |  | 851,514 |
Employee Share Purchase Plan (ESPP) |  | 47,457 |
Restricted share grants, net |  | 170,626 |
Common Shares Other: |  |
Conversion of restricted shares to LTIP Units |  | (12,146 | )
Repurchased and retired |  | (31,240 | )
Common Shares outstanding at June 30, |  | 361,562,007 |
Units |  |
Units outstanding at January 1, |  | 14,180,376 |
LTIP Units, net |  | 200,840 |
Conversion of restricted shares to LTIP Units |  | 12,146 |
Conversion of OP Units to Common Shares |  | (56,536 | )
Units outstanding at June 30, |  | 14,336,826 |
Total Common Shares and Units outstanding at June 30, |  | 375,898,833 |
Units Ownership Interest in Operating Partnership |  | 3.8 | %
Schedule Of Preferred Stock [Table Text Block] | The following table presents the Company’s issued and outstanding Preferred Shares as of June 30, 2014 and December 31, 2013:
|  |  |  |  |  | Amounts in thousands
|  | Redemption Date (1) |  | Annual Dividend per Share (2) |  | June 30, 2014 |  | December 31, 2013
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; 1,000,000 shares issued and outstanding at June 30, 2014 and December 31, 2013 |  | 12/10/26 |  |  | $4.145 |  |  | $ | 50,000 |  |  | $ | 50,000 |
|  |  |  |  |  | $ | 50,000 |  |  | $ | 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.
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, 2014 (amounts in thousands):
|  | 2014
Balance at January 1, |  | $ | 363,144 |
Change in market value |  | 80,615 |
Change in carrying value |  | (3,709 | )
Balance at June 30, |  | $ | 440,050 |
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, 2014:
|  | 2014
General and Limited Partner Units |  |
General and Limited Partner Units outstanding at January 1, |  | 374,659,636 |
Issued to General Partner: |  |
Exercise of EQR share options |  | 851,514 |
EQR’s Employee Share Purchase Plan (ESPP) |  | 47,457 |
EQR's restricted share grants, net |  | 170,626 |
Issued to Limited Partners: |  |
LTIP Units, net |  | 200,840 |
OP Units Other: |  |
Repurchased and retired |  | (31,240 | )
General and Limited Partner Units outstanding at June 30, |  | 375,898,833 |
Limited Partner Units |  |
Limited Partner Units outstanding at January 1, |  | 14,180,376 |
Limited Partner LTIP Units, net |  | 200,840 |
Conversion of EQR restricted shares to LTIP Units |  | 12,146 |
Conversion of Limited Partner OP Units to EQR Common Shares |  | (56,536 | )
Limited Partner Units outstanding at June 30, |  | 14,336,826 |
Limited Partner Units Ownership Interest in Operating Partnership |  | 3.8 | %
Schedule Of Preferred Stock [Table Text Block] | The following table presents the Operating Partnership’s issued and outstanding “Preference Units” as of June 30, 2014 and December 31, 2013:
|  |  |  |  |  | Amounts in thousands
|  | Redemption Date (1) |  | Annual Dividend per Unit (2) |  | June 30, 2014 |  | December 31, 2013
Preference Units: |  |  |  |  |  |  |  |
8.29% Series K Cumulative Redeemable Preference Units; liquidation value $50 per unit; 1,000,000 units issued and outstanding at June 30, 2014 and December 31, 2013 |  | 12/10/26 |  |  | $4.145 |  |  | $ | 50,000 |  |  | $ | 50,000 |
|  |  |  |  |  | $ | 50,000 |  |  | $ | 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.

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- Definition Tabular disclosure of redeemable noncontrolling interest (as defined) included in the statement of financial position as either a liability or temporary equity. As of the date of the statement of financial position, such redeemable noncontrolling interest is currently redeemable, as defined, for cash or other assets of the entity at (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the entity. + References No definition available. + Details
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