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CONCENTRATION OF CREDIT RISK - Brookdale Transactions (Details) $ / shares in Units, $ in Thousands, shares in Millions	Dec. 31, 2022 USD ($) property $ / shares shares	Dec. 31, 2021 USD ($)	Jul. 31, 2020 USD ($) senior_housing $ / shares shares
Concentration Risk [Line Items]
Cash and cash equivalents	$ 122,564	$ 149,725
Non-mortgage loans receivable, net	24,338	19,024
Stock warrants	$ 23,621	48,884
Annual escalators percentage			3.00%
Number of real estate properties \| property	1,300
Secured/mortgage loans and other, net
Concentration Risk [Line Items]
repayment of loan	$ 513,669	$ 488,913
Brookdale Senior Living
Concentration Risk [Line Items]
Cash and cash equivalents			$ 162,000
Non-mortgage loans receivable, net			45,000
Stock warrants			$ 28,000
Shares of common stock (in shares) \| shares	16.3		16.3
Exercise price (usd per share) \| $ / shares	$ 3.00		$ 3.00
Brookdale Senior Living \| Secured/mortgage loans and other, net
Concentration Risk [Line Items]
repayment of loan			$ 78,000
Brookdale Senior Living \| Collateral Pledged
Concentration Risk [Line Items]
Number of real estate properties \| senior_housing			5
Brookdale Senior Living \| Transfer Of Lease Deposit To Cash
Concentration Risk [Line Items]
Cash and cash equivalents			$ 47,000
Brookdale Senior Living \| Up-front Payment Arrangement
Concentration Risk [Line Items]
Up-front consideration			$ 235,000