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Dispositions of Real Estate and Discontinued Operations - Schedule of Results of Discontinued Operations (Details) - Held-for-sale - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Rental and related revenues | $ 694 | $ 24,589 | $ 7,535 | $ 81,070
Resident fees and services | 8,507 | 149,585 | 111,777 | 477,081
Total revenues | 9,201 | 174,174 | 119,312 | 558,151
Interest expense | 47 | 2,501 | 3,900 | 7,913
Depreciation and amortization | 0 | 31,659 | 0 | 134,620
Operating | 13,010 | 131,151 | 118,175 | 407,820
Transaction costs | 0 | 602 | 76 | 1,141
Impairments and loan loss reserves (recoveries), net | 21,740 | 36,327 | 32,736 | 81,556
Total costs and expenses | 34,797 | 202,240 | 154,887 | 633,050
Gain (loss) on sales of real estate, net | 26,758 | (2,134) | 408,658 | 162,245
Other income (expense), net | (863) | 316 | 5,150 | 2,442
Total other income (expense), net | 25,895 | (1,818) | 413,808 | 164,687
Income (loss) before income taxes and equity income (loss) from unconsolidated joint ventures | 299 | (29,884) | 378,233 | 89,788
Income tax benefit (expense) | 221 | (1,204) | 1,345 | 9,424
Equity income (loss) from unconsolidated joint ventures | 81 | (731) | 4,991 | (915)
Income (loss) from discontinued operations | $ 601 | $ (31,819) | $ 384,569 | $ 98,297

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