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CONSOLIDATED STATEMENT OF CHANGES IN CAPITAL OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - 9 months ended Sep. 30, 2015 - USD ($) $ in Thousands | Total | ERPOP [Member] | ERPOP [Member] Accumulated Other Comprehensive (Loss) | ERPOP [Member] Preferred Partner [Member] | ERPOP [Member] General Partner [Member] | ERPOP [Member] Limited Partner [Member] | ERPOP [Member] Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of year at Dec. 31, 2014 |  |  | $ (172,152) | $ 50,000 | $ 10,490,608 | $ 214,411 |
Balance, beginning of year at Dec. 31, 2014 |  |  |  |  |  |  | $ 124,909
Partial redemption of 8.29% Series K Cumulative Redeemable | $ 9,820 | $ 9,820 |  | (9,820) |  |  |
OP Unit Issuance: |  |  |  |  |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  |  | 4,378 | (4,378) |
Exercise of EQR share options |  |  |  |  | 37,047 |  |
EQR's Employee Share Purchase Plan (ESPP) |  | (3,376) |  |  | 3,376 |  |
Conversion of EQR restricted shares to restricted units |  |  |  |  | (70) | 70 |
Share-based employee compensation expense: |  |  |  |  |  |  |
EQR restricted shares |  |  |  |  | 12,691 |  |
EQR share options |  |  |  |  | 2,887 |  |
EQR ESPP discount |  |  |  |  | 692 |  |
Net income available to Units – General Partner |  | 660,288 |  |  | 660,288 |  |
OP Units – General Partner distributions |  |  |  |  | (603,337) |  |
Offering costs |  |  |  |  | (69) |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  |  | (1,325) |  |
Change in market value of Redeemable Limited Partners |  | (20,262) |  |  | (20,262) |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  |  | 8,470 | (8,470) |
Issuance of restricted units to Noncontrolling Interests |  |  |  |  |  | 3 |
Equity compensation associated with Units – Limited Partners |  |  |  |  |  | 18,969 |
Net income available to Units – Limited Partners |  | 26,191 |  |  |  | 26,191 |
Units – Limited Partners distributions |  |  |  |  |  | (23,719) |
Change in carrying value of Redeemable Limited Partners |  | (1,590) |  |  |  | (1,590) |
Other comprehensive income (loss) – derivative instruments: |  |  |  |  |  |  |
Unrealized holding gains arising during the period | 1,796 | 1,796 | 1,796 |  |  |  |
Losses reclassified into earnings from other comprehensive income | (13,647) | (13,647) | 13,647 |  |  |  |
Currency translation adjustments arising during the period | (311) | (311) | (311) |  |  |  |
Net income attributable to Noncontrolling Interests | $ 2,473 | $ 2,473 |  |  |  |  | 2,473
Distributions to Noncontrolling Interests |  |  |  |  |  |  | (5,389)
Deconsolidation of previously consolidated Noncontrolling Interests |  |  |  |  |  |  | (117,350)
Balance, end of period at Sep. 30, 2015 |  |  | $ (157,020) | $ 40,180 | $ 10,595,374 | $ 221,487 |
Balance, end of period at Sep. 30, 2015 |  |  |  |  |  |  | $ 4,643

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