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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) - Class of Stock [Domain] - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands | Total | PREFERRED SHARES | COMMON SHARES, $0.01 PAR VALUE | Additional Paid-in Capital [Member] | RETAINED EARNINGS | Accumulated Other Comprehensive (Loss) | OPERATING PARTNERSHIP | Partially Owned Properties [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance, Parent at Dec. 31, 2014 | $ 10,368,456 | $ 50,000 | $ 3,629 | $ 8,536,340 | $ 1,950,639 | $ (172,152) |  |
Beginning Balance, Noncontrolling Interest at Dec. 31, 2014 | 339,320 |  |  |  |  |  | $ 214,411 | $ 124,909
Preferred Shares [Abstract] |  |  |  |  |  |  |  |
Partial redemption of 8.29% Series K Cumulative Redeemable | (9,820) | (9,820) |  |  |  |  |  |
Common Share Issuance: |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 2 | 4,117 |  |  | (4,119) |
Exercise of share options |  |  | 8 | 33,976 |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  |  | 2,610 |  |  |  |
Conversion of restricted shares to restricted units |  |  |  | (70) |  |  | 70 |
Share-based employee compensation expense: |  |  |  |  |  |  |  |
Restricted Shares |  |  | 2 | 10,343 |  |  |  |
Share options |  |  |  | 2,028 |  |  |  |
ESPP discount |  |  |  | 533 |  |  |  |
Offering costs |  |  |  | (40) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | (2,227) |  |  |  |
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership | (13,966) |  |  | 13,966 |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 6,313 |  |  | (6,313) |
Net income attributable to controlling interests | 468,942 |  |  |  | 468,942 |  |  |
Common Share distributions |  |  |  |  | (402,159) |  |  |
Preferred Share distributions |  |  |  |  | (1,724) |  |  |
Premium on redemption of Preferred Shares | (2,789) |  |  |  | (2,789) |  |  |
Other comprehensive (loss) income – derivative instruments: |  |  |  |  |  |  |  |
Unrealized holding (losses) arising during the period | (112) |  |  |  |  | (112) |  |
Losses reclassified into earnings from other comprehensive income | (8,911) |  |  |  |  | 8,911 |  |
Currency translation adjustments arising during the period | (502) |  |  |  |  | (502) |  |
Issuance of restricted units to Noncontrolling Interests |  |  |  |  |  |  | 1 |
Equity Compensation associated with Noncontrolling Interests |  |  |  |  |  |  | 16,368 |
Net (income) attributable to Noncontrolling Interests - Operating Partnership | (18,413) |  |  |  |  |  | 18,413 |
Distributions to Noncontrolling Interests |  |  |  |  |  |  | (15,819) | (4,028)
Change in carrying value | 1,411 |  |  |  |  |  | (1,411) |
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties | 1,487 |  |  |  |  |  |  | 1,487
Ending Balance, Parent at Jun. 30, 2015 | 10,500,764 | $ 40,180 | $ 3,641 | $ 8,607,889 | $ 2,012,909 | $ (163,855) |  |
Ending Balance, Noncontrolling Interest at Jun. 30, 2015 | $ 343,969 |  |  |  |  |  | $ 221,601 | $ 122,368

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