Dispositions, Real Property Held for Sale and Impairment - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) property	Dec. 31, 2021 USD ($) property	Dec. 31, 2020 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate held-for-sale | $	$ 133,058	$ 134,097
Expected sale proceeds | $	198,954
Impairment of assets held for sale | $	13,146	19,567	$ 87,873
Impairment of assets held for use | $	4,356	$ 31,540	$ 47,735
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]			Asset Impairment Charges
Held For Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Lease liabilities | $	66,711
Net other assets and liabilities | $	$ (4,136)
Seniors Housing Operating
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties classified as held for sale | property	3		15
Number of properties held for use | property	1	2	6
Triple-net
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties classified as held for sale | property	7	4	1
Number of properties held for use | property	2	2	4
Outpatient Medical
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties classified as held for sale | property	1	1
Number of properties held for use | property	1