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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
--- | --- | --- | --- | ---
Jan. 31, 2020 USD ($) property | Jan. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) property | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) property | Dec. 31, 2019 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 |  |  |  |  | $ 190,590 | $ 90,350 | $ (40)
Net cash provided by (used in) financing activities |  |  |  |  | (1,288,517) | 246,450 | 647,271
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 |  |  |  |  |  |  | 30,000
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 |  |  |  |  |  |  | 23,000
Brookedale MTCA |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net | $ 164,000 |  |  |  |  |  |
Number of properties disposed | property | 18 |  |  |  |  |  |
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 |
Other Investments | Brookedale MTCA |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of properties disposed | property |  |  |  |  |  | 18 |
Senior Housing Triple Net |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  | 26,000
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 |
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 |  |  |  |  | 181,000
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] |  |  |  |  |  |  |
Number of assets sold | property |  |  | 12 |  |  |  |
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 |
Medical Office |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  | $ 28,000
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 |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of assets sold | property |  |  |  |  |  |  | 2
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 |  |  |  |  | 18
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 |  |  |  |
Proceeds from sale of buildings |  |  | $ 94,000 |  |  |  |
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 |  |  |  |  |  |  | 11
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 | 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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