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Leases and Management Agreements with Five Star - Schedule of Assets Leased and Revenues Earned (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Concentration Risk |  |  |
Gross Book Value of Real Estate Assets | $ 7,410,730 | $ 7,461,586 |
Total revenues | $ 1,632,026 | 1,040,155 | $ 1,117,164
Real Estate Investment Property At Cost | Rents from significant lessee |  |  |
Concentration Risk |  |  |
Gross Book Value of Real Estate Assets |  | $ 8,420,623 | $ 8,428,644
Concentration of credit risk (as a percent) |  | 100.00% | 100.00%
Revenue | Senior Living Communities |  |  |
Concentration Risk |  |  |
Total revenues |  | $ 433,597 | $ 416,523
Revenue | Rents from significant lessee |  |  |
Concentration Risk |  |  |
Concentration of credit risk (as a percent) |  | 100.00% | 100.00%
Total revenues |  | $ 1,040,155 | $ 1,117,164
Five Star | Real Estate Investment Property At Cost | Rents from significant lessee |  |  |
Concentration Risk |  |  |
Gross Book Value of Real Estate Assets |  | $ 2,286,951 | $ 2,253,853
Concentration of credit risk (as a percent) |  | 27.20% | 26.70%
Five Star | Real Estate Investment Property At Cost | Rents from significant lessee | Discontinued Operations, Held-for-sale |  |  |
Concentration Risk |  |  |
Gross Book Value of Real Estate Assets |  | $ 50,951 |
Five Star | Real Estate Investment Property At Cost | Rents from significant lessee | Senior Living Communities |  |  |
Concentration Risk |  |  |
Gross Book Value of Real Estate Assets |  | $ 1,920,070 |
Five Star | Revenue | Rents from significant lessee |  |  |
Concentration Risk |  |  |
Concentration of credit risk (as a percent) |  | 13.30% | 19.00%
Total revenues |  | $ 137,898 | $ 212,622
All others | Real Estate Investment Property At Cost | Rents from significant lessee |  |  |
Concentration Risk |  |  |
Gross Book Value of Real Estate Assets |  | $ 6,133,672 | $ 6,174,791
Concentration of credit risk (as a percent) |  | 72.80% | 73.30%
All others | Real Estate Investment Property At Cost | Rents from significant lessee | Discontinued Operations, Held-for-sale |  |  |
Concentration Risk |  |  |
Gross Book Value of Real Estate Assets |  | $ 213,416 | $ 3,752
All others | Revenue | Rents from significant lessee |  |  |
Concentration Risk |  |  |
Concentration of credit risk (as a percent) |  | 86.70% | 81.00%
Total revenues |  | $ 902,257 | $ 904,542

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