The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth.

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Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

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This represents the number of the properties which are classified as held for sale.

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Number Of Properties With Asset Impairment

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Dispositions, Real Property Held for Sale and Impairment - Narrative (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($) property	Sep. 30, 2020 USD ($) property	Dec. 31, 2020 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real property held for sale \| $	$ 251,152		$ 216,613
Expected proceeds from properties held for sale \| $	293,526
Impairment of assets held for use \| $	19,567
Held for sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real property held for sale \| $	$ 18,081
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	2	13
Impairment of assets held for use \| $	$ 29,183
Impairment of assets held for sale \| $		$ 79,905
Number of properties held for use \| property	2	4
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	20	1
Impairment of assets held for use \| $		$ 46,386
Number of properties subject to asset impairment \| property	4
Number of properties held for use \| property	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	2
Number of properties subject to asset impairment \| property	1