OTHER ASSETS (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	Sep. 30, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Straight-line rent receivables	$ 173,591
Straight-line rent receivables, net		$ 169,711
Non-mortgage loans receivable, net	63,989	57,077
Debt securities, available-for-sale, carrying value	0	237,553
Other intangible assets, net	7,474	4,659
Investment in unconsolidated operating entities	78,813	63,768
Other	250,502	224,363
Other assets	$ 643,253	$ 807,229
Brookdale Senior Living
Class of Warrant or Right [Line Items]
Number of securities called by warrants	16.3
Warrants, exercise price	$ 3.00

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Exercise price per share or per unit of warrants or rights outstanding.

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The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property, by the lessor or lessee, respectively. Such receivable is reduced by allowances attributable to, for instance, credit risk associated with a lessee.

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The cumulative difference between the rental payments required by ta lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property, by the lessor or lessee, respectively.

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Investment In Unconsolidated Operating Entities

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Non-mortgage Loans Receivable, Net

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