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CONSOLIDATED STATEMENT OF CHANGES IN CAPITAL OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - 3 months ended Mar. 31, 2016 - USD ($) $ in Thousands | Total | ERPOP [Member] | ERPOP [Member] Accumulated Other Comprehensive (Loss) | ERPOP [Member] Preferred Partner [Member] | ERPOP [Member] General Partner [Member] | ERPOP [Member] Limited Partner [Member] | ERPOP [Member] Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of year at Dec. 31, 2015 |  |  | $ (152,016) | $ 37,280 | $ 10,585,104 | $ 221,379 |
Balance, beginning of year at Dec. 31, 2015 |  |  |  |  |  |  | $ 4,608
OP Unit Issuance: |  |  |  |  |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  |  | 144 | (144) |
Exercise of EQR share options |  |  |  |  | 20,687 |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  |  |  | 982 |  |
Share-based employee compensation expense: |  |  |  |  |  |  |
EQR restricted shares |  |  |  |  | 5,134 |  |
EQR share options |  |  |  |  | 810 |  |
EQR ESPP discount |  |  |  |  | 173 |  |
Net income available to Units – General Partner |  | $ 3,586,985 |  |  | 3,586,985 |  |
OP Units – General Partner distributions |  |  |  |  | (3,105,215) |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  |  | 1,341 |  |
Change in market value of Redeemable Limited Partners |  | 55,478 |  |  | 55,478 |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  |  | 1,062 | (1,062) |
Limited Partners' Capital Account [Abstract] |  |  |  |  |  |  |
Issuance of restricted units to Noncontrolling Interests |  |  |  |  |  | 1 |
Equity compensation associated with Units – Limited Partners |  |  |  |  |  | 9,335 |
Net income available to Units – Limited Partners |  | 143,309 |  |  |  | 143,309 |
Units – Limited Partners distributions |  |  |  |  |  | (122,499) |
Change in carrying value of Redeemable Limited Partners |  | (9,775) |  |  |  | (9,775) |
Other comprehensive income (loss) – derivative instruments: |  |  |  |  |  |  |
Unrealized holding (losses) arising during the period | $ (2,906) | (2,906) | (2,906) |  |  |  |
Losses reclassified into earnings from other comprehensive income | (28,654) | (28,654) | 28,654 |  |  |  |
Accumulated other comprehensive income – foreign currency: |  |  |  |  |  |  |
Currency translation adjustments arising during the period | 75 | 75 | 75 |  |  |  |
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | $ 764 | $ 764 |  |  |  |  | 764
Distributions to Noncontrolling Interests |  |  |  |  |  |  | (26,781)
Other |  |  |  |  |  |  | 25,808
Balance, end of period at Mar. 31, 2016 |  |  | $ (126,193) | $ 37,280 | $ 11,152,685 | $ 240,544 |
Balance, end of period at Mar. 31, 2016 |  |  |  |  |  |  | $ 4,399

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