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CONSOLIDATED STATEMENT OF CHANGES IN CAPITAL OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - 6 months ended Jun. 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 |  |  |  | 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)

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