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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 |  |  |  |  | 356 | (356) |  |  |
Exercise of EQR share options |  |  |  |  | 6,000 |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  |  | $ 3,074 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
EQR restricted shares |  |  |  |  | 6,804 |  |  |  |
EQR share options |  |  |  |  | 9,206 |  |  |  |
EQR ESPP discount |  |  |  |  | 604 |  |  |  |
Net income available to Units - General Partner |  | $ 538,030 |  |  | 538,030 |  |  |  |
OP Units General Partner distributions |  |  |  |  | (596,735) |  |  |  |
Offering costs |  |  |  |  | (27) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  |  | (533) |  |  |  |
Change in market value of Redeemable Limited Partners |  |  |  |  | (14,361) |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | 2,619 | (2,619) |  |  |
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 |  |  |  |  | 356 | (356) |  |  |
Equity compensation associated with Units - Limited Partners |  |  |  |  |  | 11,074 |  |  |
Net income available to Units - Limited Partners |  | 20,517 |  |  |  | 20,517 |  |  |
Units - Limited Partners distributions |  |  |  |  |  | (21,560) |  |  |
Change in carrying value of Redeemable Limited Partners |  |  |  |  |  | 77 |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | 2,619 | (2,619) |  |  |
Accumulated other comprehensive income (loss) – derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | $ 24,021 | 24,021 |  |  |  |  | 24,021 |  |
Losses reclassified into earnings from other comprehensive income | (13,902) | (13,902) |  |  |  |  | 13,902 |  |
NONCONTROLLING INTERESTS PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 562,804 | 562,804 |  |  |  |  |  |  | 1,939
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  |  | 125
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  |  | (8,930)
Balance, end of period at Sep. 30, 2018 |  |  | 37,280 |  | 10,248,833 | 233,825 | (50,689) |  |
Balance, end of period at Sep. 30, 2018 |  |  |  |  |  |  |  |  | (2,158)
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Unit outstanding |  |  |  |  |  |  |  | $ 1.62 |
Balance, beginning of year at Jun. 30, 2018 |  |  | 37,280 |  | 10,238,467 | 232,995 | (67,310) |  |
Balance, beginning of year at Jun. 30, 2018 |  |  |  |  |  |  |  |  | (1,646)
OP Unit Issuance: |  |  |  |  |  |  |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  |  | 25 | (25) |  |  |
Exercise of EQR share options |  |  |  |  | 3,383 |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  |  | 893 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
EQR restricted shares |  |  |  |  | 1,641 |  |  |  |
EQR share options |  |  |  |  | 670 |  |  |  |
EQR ESPP discount |  |  |  |  | 204 |  |  |  |
Net income available to Units - General Partner |  | 214,164 |  |  | 214,164 |  |  |  |
OP Units General Partner distributions |  |  |  |  | (198,939) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  |  | 5 |  |  |  |
Change in market value of Redeemable Limited Partners |  |  |  |  | (14,189) |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | 2,509 | (2,509) |  |  |
LIMITED PARTNERS |  |  |  |  |  |  |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  |  | 25 | (25) |  |  |
Equity compensation associated with Units - Limited Partners |  |  |  |  |  | 2,958 |  |  |
Net income available to Units - Limited Partners |  | 8,159 |  |  |  | 8,159 |  |  |
Units - Limited Partners distributions |  |  |  |  |  | (7,186) |  |  |
Change in carrying value of Redeemable Limited Partners |  |  |  |  |  | (567) |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | 2,509 | (2,509) |  |  |
Accumulated other comprehensive income (loss) – derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | 12,026 | 12,026 |  |  |  |  | 12,026 |  |
Losses reclassified into earnings from other comprehensive income | (4,595) | (4,595) |  |  |  |  | 4,595 |  |
NONCONTROLLING INTERESTS PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 223,846 | 223,846 |  |  |  |  |  |  | 750
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  |  | (1,262)
Balance, end of period at Sep. 30, 2018 |  |  | 37,280 |  | 10,248,833 | 233,825 | (50,689) |  |
Balance, end of period at Sep. 30, 2018 |  |  |  |  |  |  |  |  | (2,158)
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 |  |  |  |  | 9,843 | (9,843) |  |  |
Exercise of EQR share options |  |  |  |  | 67,066 |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  |  | 2,323 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
EQR restricted shares |  |  |  |  | 10,304 |  |  |  |
EQR share options |  |  |  |  | 2,185 |  |  |  |
EQR ESPP discount |  |  |  |  | 502 |  |  |  |
Net income available to Units - General Partner |  | 678,295 |  |  | 678,295 |  |  |  |
OP Units General Partner distributions |  |  |  |  | (631,635) |  |  |  |
Offering costs |  |  |  |  | (789) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  |  | (1,539) |  |  |  |
Change in market value of Redeemable Limited Partners |  |  |  |  | (114,936) |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | 6,919 | (6,919) |  |  |
LIMITED PARTNERS |  |  |  |  |  |  |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  |  | 9,843 | (9,843) |  |  |
Equity compensation associated with Units - Limited Partners |  |  |  |  |  | 12,200 |  |  |
Net income available to Units - Limited Partners |  | 25,339 |  |  |  | 25,339 |  |  |
Units - Limited Partners distributions |  |  |  |  |  | (22,493) |  |  |
Change in carrying value of Redeemable Limited Partners |  |  |  |  |  | (957) |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | 6,919 | (6,919) |  |  |
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 | (14,659) | (14,659) |  |  |  |  | 14,659 |  |
NONCONTROLLING INTERESTS PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 708,402 | 708,402 |  |  |  |  |  |  | 2,450
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  |  | 4,594
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  |  | (6,453)
Balance, end of period at Sep. 30, 2019 |  |  | 37,280 |  | 10,229,448 | 226,065 | (84,092) |  |
Balance, end of period at Sep. 30, 2019 |  |  |  |  |  |  |  |  | (1,702)
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Unit outstanding |  |  |  |  |  |  |  | 1.7025 |
Balance, beginning of year at Jun. 30, 2019 |  |  | 37,280 |  | 10,206,098 | 227,320 | (89,849) |  |
Balance, beginning of year at Jun. 30, 2019 |  |  |  |  |  |  |  |  | (1,298)
OP Unit Issuance: |  |  |  |  |  |  |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  |  | 4,972 | (4,972) |  |  |
Exercise of EQR share options |  |  |  |  | 18,579 |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  |  | $ 671 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
EQR restricted shares |  |  |  |  | 2,322 |  |  |  |
EQR share options |  |  |  |  | 503 |  |  |  |
EQR ESPP discount |  |  |  |  | 137 |  |  |  |
Net income available to Units - General Partner |  | 266,333 |  |  | 266,333 |  |  |  |
OP Units General Partner distributions |  |  |  |  | (210,719) |  |  |  |
Offering costs |  |  |  |  | (634) |  |  |  |
Change in market value of Redeemable Limited Partners |  |  |  |  | (57,962) |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | (852) | 852 |  |  |
LIMITED PARTNERS |  |  |  |  |  |  |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  |  | 4,972 | (4,972) |  |  |
Equity compensation associated with Units - Limited Partners |  |  |  |  |  | 1,371 |  |  |
Net income available to Units - Limited Partners |  | 9,910 |  |  |  | 9,910 |  |  |
Units - Limited Partners distributions |  |  |  |  |  | (7,414) |  |  |
Change in carrying value of Redeemable Limited Partners |  |  |  |  |  | (1,002) |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  |  | (852) | 852 |  |  |
Accumulated other comprehensive income (loss) – derivative instruments: |  |  |  |  |  |  |  |  |
Losses reclassified into earnings from other comprehensive income | (5,757) | (5,757) |  |  |  |  | 5,757 |  |
NONCONTROLLING INTERESTS PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | $ 277,846 | $ 277,846 |  |  |  |  |  |  | 830
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  |  | (1,234)
Balance, end of period at Sep. 30, 2019 |  |  | $ 37,280 |  | $ 10,229,448 | $ 226,065 | $ (84,092) |  |
Balance, end of period at Sep. 30, 2019 |  |  |  |  |  |  |  |  | $ (1,702)
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Unit outstanding |  |  |  |  |  |  |  | $ 0.5675 |

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