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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] ERPOP [Member] | PARTIALLY OWNED PROPERTIES [Member] ERPOP [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
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
Balance, beginning of year at Dec. 31, 2021 |  |  | 37,280 | 10,951,940 | 214,094 | (34,272) |  |
Balance, beginning of year at Dec. 31, 2021 |  |  |  |  |  |  |  | 18,166
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  | 174 | (174) |  |  |
Exercise of EQR share options |  |  |  | 14,344 |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  |  | 969 |  |  |  |
EQR restricted shares |  |  |  | 3,611 | 1 |  |  |
EQR share options |  |  |  | 876 |  |  |  |
EQR ESPP discount |  |  |  | 171 |  |  |  |
Net income available to Units - General Partner |  | 69,993 |  | 69,993 |  |  |  |
OP Units General Partner distributions |  |  |  | (235,351) |  |  |  |
Offering costs |  |  |  | (114) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | (163) |  |  |  |
Change in market value of Redeemable Limited Partners |  |  |  | 939 |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  | 1,045 | (1,045) |  |  |
Equity compensation associated with Units - Limited Partners |  |  |  |  | 7,798 |  |  |
Net income available to Units - Limited Partners |  | 2,394 |  |  | 2,394 |  |  |
Units - Limited Partners distributions |  |  |  |  | (7,895) |  |  |
Change in carrying value of Redeemable Limited Partners |  |  |  |  | 2,278 |  |  |
Unrealized holding (losses) arising during the period | 639 | 639 |  |  |  |  |  |
Losses reclassified into earnings from other comprehensive income | (2,425) | (2,425) |  |  |  | 2,425 |  |
Distributions declared per Unit outstanding |  |  |  |  |  |  | $ 0.625 |
Net income attributable to Noncontrolling Interests | $ 73,798 | $ 73,798 |  |  |  |  |  | 639
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  | 446
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (15,836)
Balance, end of period at Mar. 31, 2022 |  |  | $ 37,280 | $ 10,808,434 | $ 217,451 | $ (31,847) |  |
Balance, end of period at Mar. 31, 2022 |  |  |  |  |  |  |  | $ 3,415

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