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Leases - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) property | Jun. 30, 2019 USD ($) facility | Mar. 31, 2019 USD ($) property | Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) property | Dec. 31, 2018 USD ($)
Capital Leased Assets [Line Items] |  |  |  |  |  |  |
Proceeds from sale of lease receivables | $ 82,000 |  |  |  |  |  |
Gain on sale of direct financing lease | $ 42,000 |  |  |  |  |  |
Conversion of DFLs to real estate |  |  |  |  | $ 0 | $ 350,540 | $ 0
Intangible assets, net |  | $ 260,204 |  |  | $ 519,917 | $ 260,204 |
Properties subject to direct financing leases (in properties) | property |  | 2 |  |  | 1 | 2 |
Impairments and loan loss reserves (recoveries), net |  |  |  |  | $ 42,909 | $ 17,708 | $ 10,917
Number Of Tenant Exercise Option To Purchase | property |  | 1 |  |  |  |  |
Purchase options land |  | $ 226,000 |  |  |  | $ 226,000 |
Senior Housing Operating Portfolio |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |
Proceeds from sale of lease receivables |  |  | $ 274,000 |  |  |  |
Number of leases disposed of (in facilities) | facility |  |  | 13 |  |  |  |
Impairments and loan loss reserves (recoveries), net |  |  | $ 10,000 |  |  |  |
DFL Portfolio | Watch List DFLs | Senior housing triple-net |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |
Properties with derecognized carrying value during the period (in properties) | property |  |  |  | 14 |  |  |
Conversion of DFLs to real estate |  |  |  | $ 351,000 |  |  |
DFL Portfolio | Watch List DFLs | Senior Housing Operating Portfolio |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |
Properties subject to direct financing leases (in properties) | property |  |  |  | 14 |  |  |
DFL Portfolio | Real Estate Investment | Watch List DFLs | Senior Housing Operating Portfolio |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |
Real estate investment property, at cost |  |  |  | $ 331,000 |  |  |
DFL Portfolio | Finite-Lived Intangible Assets | Watch List DFLs | Senior Housing Operating Portfolio |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |
Intangible assets, net |  |  |  | $ 20,000 |  |  |

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