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Leases - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) | Jun. 30, 2019 USD ($) facility | Mar. 31, 2019 USD ($) property | Dec. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Properties subject to direct financing leases (in properties) | property |  |  |  | 1 | 1 |
Net investment in direct financing leases before allowance |  |  |  | $ 44,706 | $ 44,706 |
Proceeds from sale of lease receivables | $ 82,000 |  |  |  |  |
Gain on sale of direct financing lease | $ 42,000 |  |  |  |  |
Impairments and loan loss reserves, net |  |  |  | 23,160 | 42,909 | $ 17,708
Direct financing lease, lease income |  |  |  |  |  | 17,000
Proceeds from lease payment, operating activity |  |  |  |  |  | 16,000
Conversion of DFLs to real estate |  |  |  | 0 | 0 | 350,540
Intangible assets, net |  |  |  | 519,760 | 519,917 |
Medical Office |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Net investment in direct financing leases before allowance |  |  |  | $ 45,000 | $ 45,000 |
Impairments and loan loss reserves, net |  |  |  |  |  | $ 4,000
Senior Housing Operating Portfolio |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Proceeds from sale of lease receivables |  | $ 274,000 |  |  |  |
Number of leases disposed of (in facilities) | facility |  | 13 |  |  |  |
Impairments and loan loss reserves, net |  | $ 10,000 |  |  |  |
DFL Portfolio | Watch list loans | Senior Housing Operating Portfolio |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Properties subject to direct financing leases (in properties) | property |  |  | 14 |  |  |
DFL Portfolio | Watch list loans | Senior Housing Triple Net |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Properties with derecognized carrying value during the period (in properties) | property |  |  | 14 |  |  |
Conversion of DFLs to real estate |  |  | $ 351,000 |  |  |
DFL Portfolio | Real Estate Investment | Watch list loans | Senior Housing Operating Portfolio |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Real estate investment property, at cost |  |  | 331,000 |  |  |
DFL Portfolio | Finite-Lived Intangible Assets | Watch list loans | Senior Housing Operating Portfolio |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Intangible assets, net |  |  | $ 20,000 |  |  |

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