INTANGIBLE ASSETS AND LIABILITIES - Real Estate Intangible Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Real estate intangible amortization income (expense)
(Decrease) increase to rental income related to above/below market leases, net	$ (13,512)	$ 849	$ 508
Depreciation and amortization related to tenant origination and absorption costs and tenant relationship	(8,694)	$ (10,620)	$ (17,674)
Avamere \| Above market leases
Real estate intangible amortization income (expense)
Accelerated amortization	$ 18,600

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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