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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] | 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, 2018 |  |  | $ 37,280 |  | $ 10,200,910 | $ 228,738 | $ (64,986) |  |
Balance, beginning of year at Dec. 31, 2018 |  |  |  |  |  |  |  |  | $ (2,293)
OP Unit Issuance: |  |  |  |  |  |  |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  |  | 4,787 | (4,787) |  |  |
Exercise of EQR share options |  |  |  |  | 29,860 |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  |  | $ 1,126 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
EQR restricted shares |  |  |  |  | 4,578 |  |  |  |
EQR share options |  |  |  |  | 793 |  |  |  |
EQR ESPP discount |  |  |  |  | 267 |  |  |  |
Net income available to Units - General Partner |  | $ 103,766 |  |  | 103,766 |  |  |  |
OP Units General Partner distributions |  |  |  |  | (210,497) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  |  | (602) |  |  |  |
Change in market value of Redeemable Limited Partners |  |  |  |  | (55,021) |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | 4,652 | (4,652) |  |  |
LIMITED PARTNERS |  |  |  |  |  |  |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  |  | 4,787 | (4,787) |  |  |
Equity compensation associated with Units - Limited Partners |  |  |  |  |  | 7,903 |  |  |
Net income available to Units - Limited Partners |  | 3,919 |  |  |  | 3,919 |  |  |
Units - Limited Partners distributions |  |  |  |  |  | (7,605) |  |  |
Change in carrying value of Redeemable Limited Partners |  |  |  |  |  | 1,565 |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | 4,652 | (4,652) |  |  |
Accumulated other comprehensive income (loss) - derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | $ (14,420) | (14,420) |  |  |  |  | (14,420) |  |
Losses reclassified into earnings from other comprehensive income | (4,393) | (4,393) |  |  |  |  | 4,393 |  |
NONCONTROLLING INTERESTS PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 109,257 | 109,257 |  |  |  |  |  |  |
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  |  | (3,968)
Net income attributable to Noncontrolling Interests | 799 | 799 |  |  |  |  |  |  | 799
Balance, end of period at Mar. 31, 2019 |  |  | 37,280 |  | 10,084,619 | 225,081 | (75,013) |  |
Balance, end of period at Mar. 31, 2019 |  |  |  |  |  |  |  |  | (5,462)
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Unit outstanding |  |  |  |  |  |  |  | $ 0.5675 |
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
OP Unit Issuance: |  |  |  |  |  |  |  |  |
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 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
EQR restricted shares |  |  |  |  | 4,023 |  |  |  |
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 |  |  |
LIMITED PARTNERS |  |  |  |  |  |  |  |  |
Issuance of restricted units to Limited Partners |  |  |  |  |  | 12 |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  |  | 1,844 | (1,844) |  |  |
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) |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | (3,440) | 3,440 |  |  |
Accumulated other comprehensive income (loss) - derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | (967) | (967) |  |  |  |  | (967) |  |
Losses reclassified into earnings from other comprehensive income | (5,634) | (5,634) |  |  |  |  | 5,634 |  |
NONCONTROLLING INTERESTS PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 332,671 | 332,671 |  |  |  |  |  |  |
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  |  | 341
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  |  | (9,315)
Net income attributable to Noncontrolling Interests | $ 12,530 | $ 12,530 |  |  |  |  |  |  | 12,530
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
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Unit outstanding |  |  |  |  |  |  |  | $ 0.6025 |

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