LOANS RECEIVABLE AND OTHER INVESTMENTS - Composition of Loans Receivable and Other Investments (Details) $ in Thousands	Sep. 30, 2023 USD ($) loan investment preferredEquityInvestment	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Loans Receivable:
Quantity | loan	12
Principal balance	$ 371,133	$ 370,364
Book value	367,703	366,936
Allowance for loan losses	(6,677)	(6,611)	$ (6,427)	$ (6,344)
Book value	$ 361,026	360,325
Weighted Average Contractual Interest Rate / Rate of Return	7.60%
Weighted Average Annualized Effective Interest Rate / Rate of Return	7.60%
Other Investments:
Quantity | preferredEquityInvestment	5
Principal balance	$ 56,760	50,902
Book value	$ 56,921	51,071
Weighted Average Contractual Interest Rate / Rate of Return	11.00%
Weighted Average Annualized Effective Interest Rate / Rate of Return	11.00%
Total quantity | investment	17
Total principal balance	$ 427,893
Total book value	$ 417,947	411,396
Total weighted average contractual interest rate / rate of return	8.10%
Total weighted average annualized effective interest rate / rate of return	8.00%
Mortgage
Loans Receivable:
Quantity | loan	2
Principal balance	$ 319,000
Book value	$ 319,000	319,000
Weighted Average Contractual Interest Rate / Rate of Return	7.60%
Weighted Average Annualized Effective Interest Rate / Rate of Return	7.60%
Other
Loans Receivable:
Quantity | loan	10
Principal balance	$ 52,133
Book value	$ 48,703	$ 47,936
Weighted Average Contractual Interest Rate / Rate of Return	7.50%
Weighted Average Annualized Effective Interest Rate / Rate of Return	7.00%