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 Held For Use

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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	3 Months Ended
	Mar. 31, 2021 USD ($) property	Mar. 31, 2020 USD ($) 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	$ 564,062		$ 216,613
Expected proceeds from properties held for sale	716,835
Impairment of assets held for use	12,098
Held for sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real property held for sale	$ 37,389
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 use	$ 11,470
Impairment of assets held for sale		$ 3,495
Number of properties held for use \| property	1	1
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	61
Impairment of assets held for use		$ 24,332
Number of properties subject to asset impairment \| property	1
Number of properties held for use \| property	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 \| property	1