Dispositions, Real Property Held for Sale and Impairment - Narrative (Details)	3 Months Ended
	Mar. 31, 2023 USD ($) property	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	[1]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate held-for-sale	$ 215,583,000		$ 133,058,000
Expected sale proceeds	292,623,000
Impairment of assets held for sale	12,629,000	$ 0
Held for sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Lease liabilities	66,530,000
Net other assets and liabilities	(6,095,000)
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from real estate dispositions, net	$ (11,733,000)	$ 1,337,000
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	5
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
Number of properties held for use | property	3
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
Number of properties held for use | property	1

[1] The consolidated balance sheet at December 31, 2022 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.