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MORTGAGE LOAN RECEIVABLES - Additional Information (Details) $ in Thousands		1 Months Ended		3 Months Ended		12 Months Ended
		Feb. 28, 2023 USD ($)	Jan. 31, 2023 security	Mar. 31, 2023 USD ($) loans	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) loans	Dec. 31, 2021 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount				$ 3,840,942		$ 3,938,615
Allowance for current expected credit losses				26,200		21,500
General CECL Reserve				25,499	$ 32,332	20,755	$ 31,752
Increase in reserve of unfunded commitments				700		700
Individually impaired loans				25,827		26,012
Provision for (release of) loan loss reserves, net				4,736	874
Increase (decrease) of reserve on unfunded commitments				(8)	(300)
Number of loans in default | security			1
Mortgage loans receivable	[1]			3,794,075		3,885,746
Loans nonaccrual status, amount				53,624		53,809
Principal balance of loans on non-accrual status				53,624		53,809
Office
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgage loans receivable				920,152		980,031
Asset Specific Reserve, Company Loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
General CECL Reserve				$ 2,700		$ 2,700
Number or loans in default | loans				2		2
Provision for (release of) loan loss reserves, net					600
Provision for (release of) loan loss reserves, net				$ 4,700
Total mortgage loan receivables held for investment, net, at amortized cost
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable with variable rates of interest				$ 3,300,000		$ 3,400,000
Loans receivable with variable rates of interest				87.20%		87.20%
Loans receivable with variable rates of interest, subject to interest rate floors				100.00%		99.00%
Outstanding Face Amount				$ 3,809,592		$ 3,907,265
General CECL Reserve				25,499	32,332	20,755	$ 31,752
Provision for (release of) loan loss reserves, net				4,744	$ 580
Total mortgage loan receivables held for investment, net, at amortized cost | London Interbank Offered Rate (LIBOR)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable with variable rates of interest				2,300,000		2,300,000
Total mortgage loan receivables held for investment, net, at amortized cost | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable with variable rates of interest				1,000,000		1,100,000
Mortgage loan  receivables held for sale
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount				$ 31,350		$ 31,350
Percentage of loans receivable with fixed rates of interest				100.00%		100.00%
First mortgage loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount				$ 3,766,258		$ 3,841,315
First mortgage loans | Office | New York, NY
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgage loans receivable		$ 51,500		$ 48,000
Fixed rate		7.00%
Current pay rate		5.00%
Accrue rate		2.00%
Principal paydown		$ 3,500
Reserve funding		$ 6,500
Accrue rate, nonaccrual		2.00%
First mortgage loans | London Interbank Offered Rate (LIBOR) | Office | New York, NY
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable with variable rates of interest		2.80%
[1] Includes amounts relating to consolidated variable interest entities. Refer to Note 2 and Note 9.

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