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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 [Member] ERPOP [Member] | ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ERPOP [Member] | DISTRIBUTIONS | PARTIALLY OWNED PROPERTIES [Member] ERPOP [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of year at Dec. 31, 2017 |  |  | $ 37,280 |  | $ 10,293,796 | $ 226,691 | $ (88,612) |  |
Balance, beginning of year at Dec. 31, 2017 |  |  |  |  |  |  |  |  | $ 4,708
OP Unit Issuance: |  |  |  |  |  |  |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  |  | 134 | (134) |  |  |
Exercise of EQR share options |  |  |  |  | 1,600 |  |  |  |
EQR’s Employee Share Purchase Plan (ESPP) |  |  |  | $ 1,681 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
EQR restricted shares |  |  |  |  | 2,623 |  |  |  |
EQR share options |  |  |  |  | 7,338 |  |  |  |
EQR ESPP discount |  |  |  |  | 297 |  |  |  |
Net income available to Units – General Partner |  | $ 211,036 |  |  | 211,036 |  |  |  |
OP Units General Partner distributions |  |  |  |  | (198,928) |  |  |  |
Offering costs |  |  |  |  | (26) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  |  | 83 |  |  |  |
Change in market value of Redeemable Limited Partners |  |  |  |  | 12,831 |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | (2,839) | 2,839 |  |  |
LIMITED PARTNERS |  |  |  |  |  |  |  |  |
Issuance of restricted units to Limited Partners |  |  |  |  |  | 1 |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  |  | 134 | (134) |  |  |
Equity compensation associated with Units – Limited Partners |  |  |  |  |  | 4,803 |  |  |
Net income available to Units – Limited Partners |  | 8,059 |  |  |  | 8,059 |  |  |
Units – Limited Partners distributions |  |  |  |  |  | (7,188) |  |  |
Change in carrying value of Redeemable Limited Partners |  |  |  |  |  | (443) |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | (2,839) | 2,839 |  |  |
Accumulated other comprehensive income (loss) – derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | $ 6,087 | 6,087 |  |  |  |  | 6,087 |  |
Losses reclassified into earnings from other comprehensive income | (4,791) | (4,791) |  |  |  |  | 4,791 |  |
NONCONTROLLING INTERESTS PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 220,548 | 220,548 |  |  |  |  |  |  | 680
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  |  | 125
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  |  | (4,220)
Balance, end of period at Mar. 31, 2018 |  |  | 37,280 |  | 10,329,626 | 234,628 | (77,734) |  |
Balance, end of period at Mar. 31, 2018 |  |  |  |  |  |  |  |  | 1,293
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Unit outstanding |  |  |  |  |  |  |  | $ 0.54 |
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 |  |  |  |  |  |  | 799
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  |  | (3,968)
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 |

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