Dispositions, Real Property Held for Sale and Impairment - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Jun. 30, 2023 property	Sep. 30, 2023 property	Jun. 30, 2023 property	Dec. 31, 2023 USD ($) property	Dec. 31, 2022 USD ($) property	Dec. 31, 2021 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate held-for-sale | $				$ 372,883	$ 133,058
Expected sale proceeds | $				546,568
Impairment of assets held for sale | $				15,401	13,146	$ 19,567
Impairment of assets held for use | $				$ 20,696	4,356	$ 31,540
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]						Asset Impairment Charges
Revera Joint Venture Disposal Transaction
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold	4	13	31	14
Impairment of assets held for sale | $				$ 28,708
Assets held for sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Secured debt | $				185,263
Net other assets and liabilities | $				21,568
Disposal Group, Held-for-Sale or 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 continuing operations | $				$ 58,816	$ (8,941)	$ 11,437
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				15
Number of properties held for sale, impaired				4	1
Number of properties held for use				3		2
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				1
Number of properties held for sale, impaired						4
Number of properties held for use				2	2	2
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				4
Number of properties held for sale, impaired						1
Number of properties held for use					1