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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 (LOSS) [Member] ERPOP [Member] | DISTRIBUTIONS | Partially Owned Properties 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 |  |  |  |  | 331 | (331) |  |  |
Exercise of EQR share options |  |  |  |  | 2,617 |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  |  | $ 2,181 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
EQR restricted shares |  |  |  |  | 5,163 |  |  |  |
EQR share options |  |  |  |  | 8,536 |  |  |  |
EQR ESPP discount |  |  |  |  | 400 |  |  |  |
Net income available to Units - General Partner |  | $ 323,866 |  |  | 323,866 |  |  |  |
OP Units General Partner distributions |  |  |  |  | (397,796) |  |  |  |
Offering costs |  |  |  |  | (27) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  |  | (538) |  |  |  |
Change in market value of Redeemable Limited Partners |  |  |  |  | (172) |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | 110 | (110) |  |  |
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 |  |  |  |  | 331 | (331) |  |  |
Equity compensation associated with Units - Limited Partners |  |  |  |  |  | 8,116 |  |  |
Net income available to Units - Limited Partners |  | 12,358 |  |  |  | 12,358 |  |  |
Units - Limited Partners distributions |  |  |  |  |  | (14,374) |  |  |
Change in carrying value of Redeemable Limited Partners |  |  |  |  |  | 644 |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | 110 | (110) |  |  |
Accumulated other comprehensive income (loss) – derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | $ 11,995 | 11,995 |  |  |  |  | 11,995 |  |
Losses reclassified into earnings from other comprehensive income | (9,307) | (9,307) |  |  |  |  | 9,307 |  |
NONCONTROLLING INTERESTS PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 338,958 | 338,958 |  |  |  |  |  |  | 1,189
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  |  | 125
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  |  | (7,668)
Balance, end of period at Jun. 30, 2018 |  |  | 37,280 |  | 10,238,467 | 232,995 | (67,310) |  |
Balance, end of period at Jun. 30, 2018 |  |  |  |  |  |  |  |  | (1,646)
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Unit outstanding |  |  |  |  |  |  |  | $ 1.08 |
Balance, beginning of year at Mar. 31, 2018 |  |  | 37,280 |  | 10,329,626 | 234,628 | (77,734) |  |
Balance, beginning of year at Mar. 31, 2018 |  |  |  |  |  |  |  |  | 1,293
OP Unit Issuance: |  |  |  |  |  |  |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  |  | 197 | (197) |  |  |
Exercise of EQR share options |  |  |  |  | 1,017 |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  |  | 500 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
EQR restricted shares |  |  |  |  | 2,540 |  |  |  |
EQR share options |  |  |  |  | 1,198 |  |  |  |
EQR ESPP discount |  |  |  |  | 103 |  |  |  |
Net income available to Units - General Partner |  | 112,830 |  |  | 112,830 |  |  |  |
OP Units General Partner distributions |  |  |  |  | (198,868) |  |  |  |
Offering costs |  |  |  |  | (1) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  |  | (621) |  |  |  |
Change in market value of Redeemable Limited Partners |  |  |  |  | (13,003) |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | 2,949 | (2,949) |  |  |
LIMITED PARTNERS |  |  |  |  |  |  |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  |  | 197 | (197) |  |  |
Equity compensation associated with Units - Limited Partners |  |  |  |  |  | 3,313 |  |  |
Net income available to Units - Limited Partners |  | 4,299 |  |  |  | 4,299 |  |  |
Units - Limited Partners distributions |  |  |  |  |  | (7,186) |  |  |
Change in carrying value of Redeemable Limited Partners |  |  |  |  |  | 1,087 |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | 2,949 | (2,949) |  |  |
Accumulated other comprehensive income (loss) – derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | 5,908 | 5,908 |  |  |  |  | 5,908 |  |
Losses reclassified into earnings from other comprehensive income | (4,516) | (4,516) |  |  |  |  | 4,516 |  |
NONCONTROLLING INTERESTS PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 118,410 | 118,410 |  |  |  |  |  |  | 509
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  |  | (3,448)
Balance, end of period at Jun. 30, 2018 |  |  | 37,280 |  | 10,238,467 | 232,995 | (67,310) |  |
Balance, end of period at Jun. 30, 2018 |  |  |  |  |  |  |  |  | (1,646)
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 |  |  |  |  | 4,871 | (4,871) |  |  |
Exercise of EQR share options |  |  |  |  | 48,487 |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  |  | 1,652 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
EQR restricted shares |  |  |  |  | 7,982 |  |  |  |
EQR share options |  |  |  |  | 1,682 |  |  |  |
EQR ESPP discount |  |  |  |  | 365 |  |  |  |
Net income available to Units - General Partner |  | 411,962 |  |  | 411,962 |  |  |  |
OP Units General Partner distributions |  |  |  |  | (420,916) |  |  |  |
Offering costs |  |  |  |  | (155) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  |  | (1,539) |  |  |  |
Change in market value of Redeemable Limited Partners |  |  |  |  | (56,974) |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | 7,771 | (7,771) |  |  |
LIMITED PARTNERS |  |  |  |  |  |  |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  |  | 4,871 | (4,871) |  |  |
Equity compensation associated with Units - Limited Partners |  |  |  |  |  | 10,829 |  |  |
Net income available to Units - Limited Partners |  | 15,429 |  |  |  | 15,429 |  |  |
Units - Limited Partners distributions |  |  |  |  |  | (15,079) |  |  |
Change in carrying value of Redeemable Limited Partners |  |  |  |  |  | 45 |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | 7,771 | (7,771) |  |  |
Accumulated other comprehensive income (loss) – derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | (33,765) | (33,765) |  |  |  |  | (33,765) |  |
Losses reclassified into earnings from other comprehensive income | (8,902) | (8,902) |  |  |  |  | 8,902 |  |
NONCONTROLLING INTERESTS PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 430,556 | 430,556 |  |  |  |  |  |  | 1,620
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  |  | 4,594
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  |  | (5,219)
Balance, end of period at Jun. 30, 2019 |  |  | 37,280 |  | 10,206,098 | 227,320 | (89,849) |  |
Balance, end of period at Jun. 30, 2019 |  |  |  |  |  |  |  |  | (1,298)
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Unit outstanding |  |  |  |  |  |  |  | 1.135 |
Balance, beginning of year at Mar. 31, 2019 |  |  | 37,280 |  | 10,084,619 | 225,081 | (75,013) |  |
Balance, beginning of year at Mar. 31, 2019 |  |  |  |  |  |  |  |  | (5,462)
OP Unit Issuance: |  |  |  |  |  |  |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  |  | 84 | (84) |  |  |
Exercise of EQR share options |  |  |  |  | 18,627 |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  |  | $ 526 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
EQR restricted shares |  |  |  |  | 3,404 |  |  |  |
EQR share options |  |  |  |  | 889 |  |  |  |
EQR ESPP discount |  |  |  |  | 98 |  |  |  |
Net income available to Units - General Partner |  | 308,196 |  |  | 308,196 |  |  |  |
OP Units General Partner distributions |  |  |  |  | (210,419) |  |  |  |
Offering costs |  |  |  |  | (155) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  |  | (937) |  |  |  |
Change in market value of Redeemable Limited Partners |  |  |  |  | (1,953) |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | 3,119 | (3,119) |  |  |
LIMITED PARTNERS |  |  |  |  |  |  |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  |  | 84 | (84) |  |  |
Equity compensation associated with Units - Limited Partners |  |  |  |  |  | 2,926 |  |  |
Net income available to Units - Limited Partners |  | 11,510 |  |  |  | 11,510 |  |  |
Units - Limited Partners distributions |  |  |  |  |  | (7,474) |  |  |
Change in carrying value of Redeemable Limited Partners |  |  |  |  |  | (1,520) |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | 3,119 | (3,119) |  |  |
Accumulated other comprehensive income (loss) – derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | (19,345) | (19,345) |  |  |  |  | (19,345) |  |
Losses reclassified into earnings from other comprehensive income | (4,509) | (4,509) |  |  |  |  | 4,509 |  |
NONCONTROLLING INTERESTS PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | $ 321,299 | $ 321,299 |  |  |  |  |  |  | 821
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  |  | 4,594
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  |  | (1,251)
Balance, end of period at Jun. 30, 2019 |  |  | $ 37,280 |  | $ 10,206,098 | $ 227,320 | $ (89,849) |  |
Balance, end of period at Jun. 30, 2019 |  |  |  |  |  |  |  |  | $ (1,298)
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Unit outstanding |  |  |  |  |  |  |  | $ 0.5675 |

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