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Investment Activity (2021 Asset Dispositions) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) property | Aug. 31, 2021 USD ($) property | Dec. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) property | Jun. 30, 2021 USD ($) facility property | Sep. 30, 2020 USD ($) | Dec. 31, 2022 USD ($) property facility | Dec. 31, 2021 USD ($) numberOfProperty | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | May 31, 2022 property | Apr. 01, 2022 property
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Properties | property |  |  |  |  |  |  | 160 |  |  |  |  |
Total |  |  |  |  |  |  | $ 159,625 |  |  |  |  |
Gains on sales of real estate, net |  |  |  |  |  |  | 28,342 | $ 32,498 | $ 21,316 |  |  |
Lease Income |  |  |  |  |  |  | (217,700) | (271,049) | (307,208) |  |  |
Impairment of property |  |  | $ (5,895) |  |  |  | (21,531) |  | (6,400) | $ 0 |  |
Asset impairment charges |  |  |  |  |  |  |  | 51,800 |  |  |  |
Asset Held For Sale In 2022 |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Lease Income |  |  |  |  |  |  | (2,100) | (5,600) | (7,600) |  |  |
Asset Held For Sale In 2021 |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Lease Income |  |  |  |  |  |  |  | $ (5,400) | (8,000) |  |  |
Real Estate Investments |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  | $ 51,600 |  |  |  |  |
Real estate properties, impaired, sold or classified as held for sale |  |  |  |  |  |  | 19 | 10 |  |  |  |
Holiday Acquisition Holdings |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset disposition transaction cost |  | $ (900) |  |  |  |  |  |  |  |  |  |
Holiday Arbor Glenn |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset disposition transaction cost | $ (100) |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gains on sales of real estate, net |  |  | 32,468 |  |  |  |  |  |  |  |  |
Straight line rent adjustments |  |  | $ 2,354 |  |  |  |  |  |  |  |  |
Bickford Senior Living |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Properties |  |  |  |  |  |  | 36 |  |  |  | 3 |
Proceeds from sale of real estate |  |  |  |  | $ 39,900 |  |  |  |  |  |  |
Total |  |  |  |  |  |  | $ 28,900 |  |  |  |  |
Gains on sales of real estate, net |  |  |  |  | $ 3,568 |  |  |  |  |  |  |
Lease Income |  |  |  |  |  |  | (27,600) | $ (34,599) | (49,451) |  |  |
Impairment of property |  |  |  | $ 0 |  |  |  |  |  |  |  |
Bickford Senior Living | Negotiations to sale |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Properties | property | 6 |  |  | 6 | 6 |  |  |  |  |  |  |
Bickford Senior Living | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Properties | property |  |  |  |  | 6 |  |  |  |  |  |  |
Proceeds from sale of real estate |  |  |  |  | $ 52,900 |  | 52,900 |  |  |  |  |
Total |  |  |  |  | 13,000 |  |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  | 34,500 |  |  |  |  |  |  |
Straight line rent adjustments |  |  |  |  | $ 1,871 |  | $ (1,900) |  |  |  |  |
Lease Income |  |  |  |  |  |  |  | (1,600) | (5,600) |  |  |
Bickford Senior Living | Lease Abatement for 2020 | Lease Abatement |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, variable lease income, concessions. |  |  |  |  |  | $ 2,100 |  |  |  |  |  |
Bickford Senior Living | Asset Held For Sale In 2022 |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Properties | property |  |  |  |  |  |  | 3 |  |  |  |  |
Holiday Acquisition Holdings |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Properties | facility |  |  |  |  | 17 |  |  |  |  |  |  |
Proceeds from sale of real estate |  | 115,000 |  |  |  |  |  |  |  |  |  |
Gains on sales of real estate, net |  | $ 1,900 |  | $ 1,882 |  |  |  |  |  |  |  |
Lease Income |  |  |  |  |  |  |  |  | (40,705) |  |  |
Impairment of property |  |  |  | $ 0 |  |  |  |  |  |  |  |
Holiday Acquisition Holdings | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Properties | property | 8 | 8 |  | 8 |  |  |  |  |  |  |  |
Property, plant and equipment, net |  | $ 113,600 |  |  |  |  |  |  |  |  |  |
Straight line rent adjustments |  |  |  | $ (1,360) |  |  |  |  |  |  |  |
Lease Income |  |  |  |  |  |  |  | (5,900) | (10,000) |  |  |
Holiday Acquisition Holdings | Asset Held For Sale In 2022 |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Properties | property |  |  |  |  |  |  |  |  |  |  |  | 1
Holiday Arbor Glenn |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of real estate | $ 5,800 |  |  |  |  |  |  |  |  |  |  |
Gains on sales of real estate, net |  |  |  | 0 |  |  |  |  |  |  |  |
Impairment of property | $ (4,600) |  |  | $ (4,641) |  |  |  |  |  |  |  |
Holiday Arbor Glenn | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Properties | property | 1 |  |  | 1 |  |  |  |  |  |  |  |
Property, plant and equipment, net | $ 10,400 |  |  | $ 10,400 |  |  |  |  |  |  |  |
Straight line rent adjustments |  |  |  | $ (81) |  |  |  |  |  |  |  |
Lease Income |  |  |  |  |  |  |  | $ (400) | $ (600) |  |  |

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