Dispositions, Real Property Held for Sale and Impairment - Narrative (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($) property	Jun. 30, 2021 USD ($) property	Dec. 31, 2021 USD ($)	[1]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real property held for sale	$ 177,719		$ 134,097
Expected proceeds from properties held for sale	239,019
Held for sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Lease liabilities	66,719
Other assets and liabilities, net	$ 8,068
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	11
Impairment of assets held for use		$ 29,183
Number of properties held for use | property		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 | property	1
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
Impairment of assets held for sale		$ 18,077
Number of properties held for use | property		2

[1] The consolidated balance sheet at December 31, 2021 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.