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Dispositions of Real Estate and Discontinued Operations - 2020 Dispositions of Real Estate (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2022 USD ($) property | Jan. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) property | Jun. 30, 2022 USD ($) property | Mar. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Repayments of secured debt |  |  | $ 6,000 |  |  |  |  |
Number of assets classified as discontinued operations | property |  |  | 1 |  |  |  |  | 1
Gain (loss) on sales of real estate, net |  |  |  |  |  | $ 9,078 | $ 190,590 | $ 90,350
Net cash provided by (used in) financing activities |  |  |  |  |  | $ (116,532) | (1,288,517) | 246,450
Other Investments | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Abandonment |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  | 58,000 | 283,000
Other Investments | Discontinued Operations |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  | 39,000 | 193,000
Atria SHOP Portfolio |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of assets sold | property |  |  | 12 |  |  |  |  |
Senior Housing Operating Portfolio |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  | $ 230,000 |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  | 59,000 |  |  | $ 16,000 |  |  |
Net cash provided by (used in) financing activities |  | $ 150,000 |  |  |  |  |  |
Senior Housing Operating Portfolio | Atria SHOP Portfolio |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  | $ 312,000 |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  | 39,000 |  |  |  |  |
Senior Housing Operating Portfolio | Other Investments |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  | 169,000 | $ 190,000
Senior Housing Triple Net | Aegis NNN Portfolio |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  | 358,000 |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  | $ 228,000 |  |  |  |  |
Senior Housing Triple Net | Other Investments |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  |  |  |  |  | 21
Proceeds from sale of buildings |  |  |  |  |  |  | $ 24,000 | $ 428,000
Medical Office | Other Investments |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  | 136,000
MOB Land Parcels | Other Investments |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  | $ 3,000
Senior Housing Triple Net | Aegis NNN Portfolio |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of assets sold | property |  |  | 10 |  |  |  |  |
Senior Housing Triple Net | Other Investments |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  |  |  |  | 7 |
Senior Housing Operating Portfolio |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of assets sold | property |  | 16 |  |  |  |  |  |
Senior Housing Operating Portfolio | Atria SHOP Portfolio |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of assets sold | property |  |  | 4 |  |  |  |  |
Net cash provided by (used in) financing activities |  |  | $ 61,000 |  |  |  |  |
Senior Housing Operating Portfolio | Other Investments |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  |  |  |  | 15 | 23
Medical Office |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of assets sold | property | 2 |  |  | 3 |  |  |  |
Proceeds from sale of buildings | $ 9,000 |  |  | $ 27,000 |  |  |  |
Gain (loss) on sales of real estate, net | $ 1,000 |  |  | $ 10,000 |  |  |  |
Medical Office | Other Investments |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  |  |  |  | 10 | 11
Proceeds from sale of buildings |  |  |  |  |  |  | $ 68,000 |
Medical Office | Other Investments | San Diego |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  |  |  |  |  | 3
MOB Land Parcels |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  | 1 |  |  |  |
MOB Land Parcels | Other Investments |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  |  |  |  | 1 | 2
Other Non-Reporting Segment | Other Investments |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  |  |  |  |  | 1
Proceeds from sale of buildings |  |  |  |  |  |  |  | $ 1,000

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