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CONSOLIDATED STATEMENT OF CHANGES IN CAPITAL OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands | Total | ERPOP [Member] | PREFERRED SHARES ERPOP [Member] | General Partner [Member] ERPOP [Member] | Limited Partner [Member] ERPOP [Member] | ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ERPOP [Member] | 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 |  |  |  | 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)

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