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CONSOLIDATED STATEMENTS OF CHANGES IN CAPITAL OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands | Total | ERPOP [Member] | PREFERRED SHARES ERPOP [Member] | General Partner [Member] ERPOP [Member] | Limited Partner ERPOP [Member] | ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ERPOP [Member] | DISTRIBUTIONS [Member] | PARTIALLY OWNED PROPERTIES [Member] ERPOP [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of year at Dec. 31, 2019 |  |  | $ 37,280 | $ 10,355,789 | $ 227,837 | $ (77,563) |  |
Balance, beginning of year at Dec. 31, 2019 |  |  |  |  |  |  |  | $ 1,183
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  | 1,844 | (1,844) |  |  |
Exercise of EQR share options |  |  |  | 11,151 |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  |  | 869 |  |  |  |
EQR restricted shares |  |  |  | 4,023 | 12 |  |  |
EQR share options |  |  |  | 670 |  |  |  |
EQR ESPP discount |  |  |  | 153 |  |  |  |
Net income available to Units - General Partner |  | $ 307,833 |  | 307,833 |  |  |  |
OP Units General Partner distributions |  |  |  | (224,507) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | 149 |  |  |  |
Change in market value of Redeemable Limited Partners |  |  |  | 111,449 |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  | (3,440) | 3,440 |  |  |
Equity compensation associated with Units - Limited Partners |  |  |  |  | 5,067 |  |  |
Net income available to Units - Limited Partners |  | 11,535 |  |  | 11,535 |  |  |
Units - Limited Partners distributions |  |  |  |  | (9,076) |  |  |
Change in carrying value of Redeemable Limited Partners |  |  |  |  | (1,391) |  |  |
Unrealized holding (losses) arising during the period | $ 12,530 | 12,530 |  |  |  | (967) |  |
Losses reclassified into earnings from other comprehensive income | (5,634) | (5,634) |  |  |  | 5,634 |  |
Distributions declared per Unit outstanding |  |  |  |  |  |  | $ 0.6025 |
Net income attributable to Noncontrolling Interests | 332,671 | 332,671 |  |  |  |  |  | 12,530
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  | 341
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (9,315)
Balance, end of period at Mar. 31, 2020 |  |  | 37,280 | 10,565,983 | 235,580 | (72,896) |  |
Balance, end of period at Mar. 31, 2020 |  |  |  |  |  |  |  | 4,739
Balance, beginning of year at Dec. 31, 2020 |  |  | 37,280 | 10,532,037 | 233,162 | (43,666) |  |
Balance, beginning of year at Dec. 31, 2020 |  |  |  |  |  |  |  | 4,673
Exercise of EQR share options |  |  |  | 22,882 |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  |  | 1,731 |  |  |  |
EQR restricted shares |  |  |  | 2,274 |  |  |  |
EQR share options |  |  |  | 988 |  |  |  |
EQR ESPP discount |  |  |  | 444 |  |  |  |
Net income available to Units - General Partner |  | 56,766 |  | 56,766 |  |  |  |
OP Units General Partner distributions |  |  |  | (224,673) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | (1,229) |  |  |  |
Change in market value of Redeemable Limited Partners |  |  |  | (72,956) |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  | 619 | (619) |  |  |
Equity compensation associated with Units - Limited Partners |  |  |  |  | 6,488 |  |  |
Net income available to Units - Limited Partners |  | 2,143 |  |  | 2,143 |  |  |
Units - Limited Partners distributions |  |  |  |  | (8,589) |  |  |
Change in carrying value of Redeemable Limited Partners |  |  |  |  | 2,384 |  |  |
Unrealized holding (losses) arising during the period | 682 | 682 |  |  |  |  |  |
Losses reclassified into earnings from other comprehensive income | (2,303) | (2,303) |  |  |  | 2,303 |  |
Distributions declared per Unit outstanding |  |  |  |  |  |  | $ 0.6025 |
Net income attributable to Noncontrolling Interests | $ 60,364 | $ 60,364 |  |  |  |  |  | 682
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (2,883)
Balance, end of period at Mar. 31, 2021 |  |  | $ 37,280 | $ 10,318,883 | $ 234,969 | $ (41,363) |  |
Balance, end of period at Mar. 31, 2021 |  |  |  |  |  |  |  | $ 2,472

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