Leases and Management Agreements with Five Star - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue
Revenues	$ 362,724	$ 442,467
Residents fees and services
Disaggregation of Revenue
Revenues	259,966	331,969
Residents fees and services | Basic housing and support services
Disaggregation of Revenue
Revenues	188,029	231,516
Residents fees and services | Medicare and Medicaid programs
Disaggregation of Revenue
Revenues	35,948	49,668
Residents fees and services | Private pay and other third party payer SNF services
Disaggregation of Revenue
Revenues	$ 35,989	$ 50,785