Leases and Management Agreements with Five Star - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue
Revenues	$ 346,341	$ 410,311	$ 709,065	$ 852,778
Residents fees and services
Disaggregation of Revenue
Revenues	243,947	304,104	503,913	636,073
Residents fees and services | Basic housing and support services
Disaggregation of Revenue
Revenues	188,169	218,783	376,198	450,299
Residents fees and services | Medicare and Medicaid programs
Disaggregation of Revenue
Revenues	24,907	42,910	60,855	92,578
Residents fees and services | Private pay and other third party payer SNF services
Disaggregation of Revenue
Revenues	$ 30,871	$ 42,411	$ 66,860	$ 93,196