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Impairments (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) property | Dec. 31, 2018 USD ($) property
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairments and loan loss reserves (recoveries), net |  | $ 42,909 | $ 17,708 | $ 10,917
Number of real estate properties impaired | property |  |  | 3 |
Asset impairment charge |  |  | $ 18,000 |
Casualty related gain |  |  | 5,000 |
Other Operating Income (Expense) [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Casualty related gain |  |  | 2,000 |
Discontinued Operations |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairments and loan loss reserves (recoveries), net |  | 201,000 |  |
Asset impairment charge |  |  | 9,000 |
Casualty related gain |  |  | $ 3,000 |
Senior Housing Triple Net, SHOP, And MOB [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairments and loan loss reserves (recoveries), net |  | $ 210,000 |  |
Senior Housing Operating Portfolio |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairments and loan loss reserves (recoveries), net | $ 10,000 |  |  |
Number of real estate properties impaired | property |  | 42 | 27 | 17
Number of real estate properties impaired, candidates for potential sale | property |  |  | 1 |
Senior Housing Operating Portfolio | Held-for-sale |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Number of properties classified as held for sale | property |  | 97 | 115 |
Senior Housing Operating Portfolio | Underperformed assets |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Number of real estate properties impaired | property |  |  |  | 3
Senior Housing Triple Net |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Number of real estate properties impaired | property |  | 5 | 8 |
Senior Housing Triple Net | Held-for-sale |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Number of properties classified as held for sale | property |  | 41 | 90 |
Medical Office |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairments and loan loss reserves (recoveries), net |  |  | $ 4,000 |
Number of real estate properties impaired | property |  | 5 | 3 |
Number of properties intended to be demolished | property |  |  | 1 |
Number of real estate properties impaired, candidates for potential sale | property |  |  | 2 |
Medical Office | Held-for-sale |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Number of properties classified as held for sale | property |  | 6 | 2 |
MOB Land Parcels |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Number of real estate properties impaired | property |  | 1 |  |
Life Science |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairments and loan loss reserves (recoveries), net |  | $ 15,000 |  |
Number of properties intended to be demolished | property |  | 1 |  |
Life Science | Held-for-sale |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Number of properties classified as held for sale | property |  |  |  | 1
Senior Housing Triple Net, SHOP, MOB, and Other Non-Reportable |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairments and loan loss reserves (recoveries), net |  |  | $ 194,000 |
Senior Housing Triple Net, SHOP, MOB, and Other Non-Reportable | Discontinued Operations |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairments and loan loss reserves (recoveries), net |  |  | $ 189,000 |
Other Non-Reporting Segment |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Number of real estate properties impaired | property |  |  | 1 |
Senior Housing Operating Portfolio And Undeveloped Life Science |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairments and loan loss reserves (recoveries), net |  |  |  | $ 52,000
Senior Housing Operating Portfolio And Undeveloped Life Science | Discontinued Operations |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairments and loan loss reserves (recoveries), net |  |  |  | $ 44,000
Shop Assets, Senior Housing Triple-net Assets, MOBs, and Other Non-Reportable Asset |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Aggregate carrying value before impairment |  | $ 960,000 | $ 416,000 |
Real estate held-for-sale |  | 750,000 | 223,000 |
Minimum |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairment calculation price range |  | $ 13 | $ 24 |
Market capitalization rate |  |  | 4.97% |
Terminal capitalization rate |  | 5.50% |  |
Discount rates |  | 8.00% |  |
Maximum |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairment calculation price range |  | $ 300 | $ 125 |
Market capitalization rate |  |  | 8.27% |
Terminal capitalization rate |  | 7.50% |  |
Discount rates |  | 9.50% |  |
Weighted Average |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairment calculation price range |  | $ 164 | $ 73 |
Market capitalization rate |  |  | 6.22% |

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