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Senior Living Community Leases and Management Agreements - Schedule of Assets Leased and Revenues Earned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Concentration Risk
Gross Book Value of Real Estate Assets	$ 6,813,556	$ 7,410,730
Revenue	1,383,212	1,632,026	$ 1,040,155
Senior Living Communities
Concentration Risk
Revenue	$ 974,623	$ 1,204,811	433,597
Real Estate Investment Property At Cost | Rents from significant lessee
Concentration Risk
Gross Book Value of Real Estate Assets			$ 8,420,623
Concentration of credit risk (as a percent)			100.00%
Revenue | Senior Living Communities
Concentration Risk
Revenue			$ 433,597
Revenue | Rents from significant lessee
Concentration Risk
Concentration of credit risk (as a percent)			100.00%
Revenue			$ 1,040,155
All others | Real Estate Investment Property At Cost | Rents from significant lessee
Concentration Risk
Gross Book Value of Real Estate Assets			$ 6,133,672
Concentration of credit risk (as a percent)			72.80%
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
All others | Revenue | Rents from significant lessee
Concentration Risk
Concentration of credit risk (as a percent)			86.70%
Revenue			$ 902,257
Five Star | Real Estate Investment Property At Cost | Rents from significant lessee
Concentration Risk
Gross Book Value of Real Estate Assets			$ 2,286,951
Concentration of credit risk (as a percent)			27.20%
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%
Revenue			$ 137,898

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