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Real Estate Transactions - Impairments of Real Estate (Details) $ / item in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) property | Sep. 30, 2019 USD ($) property | Jun. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) $ / item property | Sep. 30, 2019 USD ($) $ / item property
Real Estate [Line Items] |  |  |  |  |
Impairment of real estate | $ 37,000 |  |  | $ 87,000 |
Impairments and loan loss reserves (recoveries), net |  |  |  | $ 97,723 | $ 115,653
Casualty related gain |  |  |  |  | $ 5,000
Minimum |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Impairment calculation, price per unit | $ / item |  |  |  | 33 | 46
Impairment test, market capitalization rate |  | 4.97% |  |  | 4.97%
Maximum |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Impairment calculation, price per unit | $ / item |  |  |  | 300 | 125
Impairment test, market capitalization rate |  | 8.27% |  |  | 8.27%
Weighted Average |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Impairment calculation, price per unit | $ / item |  |  |  | 136 | 71
Impairment test, market capitalization rate |  | 6.09% |  |  | 6.09%
Impairments 2020 |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Real estate investment property, aggregate carrying value before impairment | 200,000 |  |  | $ 200,000 |
Real estate held-for-sale | 163,000 |  |  | 163,000 |
Impairments 2020 |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Real estate investment property, aggregate carrying value before impairment | 424,000 |  |  | 424,000 |
Real estate held-for-sale | $ 337,000 |  |  | $ 337,000 |
Impairments 2019 |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Real estate investment property, aggregate carrying value before impairment |  | $ 288,000 |  |  | $ 288,000
Seven shop senior housing triplenet asset |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Real estate investment property, aggregate carrying value before impairment |  | 124,000 |  |  | 124,000
Real estate held-for-sale |  | 90,000 |  |  | 90,000
Fifteen shop senior housing triplenet asset |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Real estate held-for-sale |  | 195,000 |  |  | 195,000
Senior housing Triple Net, SHOP, MOB, and other non-reportable |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Impairments and loan loss reserves (recoveries), net |  | $ 34,000 |  |  | $ 93,000
SHOP |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Impairments and loan loss reserves (recoveries), net |  |  | $ 10,000 |  |
Number of real estate properties impaired | property | 9 | 7 |  | 28 | 15
Senior housing triple-net |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of real estate properties impaired | property | 1 | 4 |  | 5 | 4
Medical office |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Impairments and loan loss reserves (recoveries), net |  |  |  |  | $ 9,000
Number of real estate properties impaired | property | 1 | 2 |  | 2 | 2
Asset impairment charge due to intent to demolish |  | $ 4,000 |  |  | $ 4,000
Number of real estate properties impaired due intent to demolish | property |  | 1 |  |  | 1
Undeveloped MOB land parcel |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of real estate properties impaired | property |  |  |  | 1 |
Other Non-reportable Asset [Member] |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of real estate properties impaired | property |  | 1 |  |  | 1

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