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Leases and Management Agreements with Five Star - Schedule of Assets Leased and Revenues Earned (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Book Value of Real Estate Assets | $ 7,461,586 |  |  |  | $ 7,876,300 |  |  |  | $ 7,461,586 | $ 7,876,300 |
Total revenues | 256,039 | $ 255,827 | $ 262,003 | $ 266,286 | 285,222 | $ 278,969 | $ 277,202 | $ 275,770 | 1,040,155 | 1,117,164 | $ 1,074,729
Rents from significant lessee |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,040,155 | 1,117,164 |
Real Estate Investment Property At Cost | Rents from significant lessee |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Book Value of Real Estate Assets | 8,420,623 |  |  |  | 8,428,644 |  |  |  | $ 8,420,623 | $ 8,428,644 |
Concentration of credit risk (as a percent) |  |  |  |  |  |  |  |  | 100.00% | 100.00% |
Real Estate Investment Property At Cost | Rents from significant lessee | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Book Value of Real Estate Assets |  |  |  |  | 1,920,070 |  |  |  |  | $ 1,920,070 |
Revenue |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of credit risk (as a percent) |  |  |  |  |  |  |  |  | 100.00% | 100.00% |
Revenue | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 433,597 | $ 416,523 |
Five Star | Rents from significant lessee |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 137,898 | 212,622 |
Five Star | Real Estate Investment Property At Cost | Rents from significant lessee |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Book Value of Real Estate Assets | 2,286,951 |  |  |  | 2,253,853 |  |  |  | $ 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 [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Book Value of Real Estate Assets | 50,951 |  |  |  |  |  |  |  | $ 50,951 |  |
Five Star | Revenue |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of credit risk (as a percent) |  |  |  |  |  |  |  |  | 13.30% | 19.00% |
All others | Real Estate Investment Property At Cost | Rents from significant lessee |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Book Value of Real Estate Assets | 6,133,672 |  |  |  | 6,174,791 |  |  |  | $ 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 [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Book Value of Real Estate Assets | $ 213,416 |  |  |  | $ 3,752 |  |  |  | $ 213,416 | $ 3,752 |
All others | Revenue |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of credit risk (as a percent) |  |  |  |  |  |  |  |  | 86.70% | 81.00% |
Total revenues |  |  |  |  |  |  |  |  | $ 902,257 | $ 904,542 |

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