FAIR VALUE MEASUREMENTS - Schedule of Items Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Mortgage Secured and Mezzanine Loans Receivable
Assets:
Loan receivable	$ 181,175	$ 156,368
Recurring | Mortgage secured loans receivable
Assets:
Loan receivable	159,371	117,684
Recurring | Mezzanine loans receivable
Assets:
Loan receivable	21,804	38,684
Recurring | Level 1 | Mortgage Secured and Mezzanine Loans Receivable
Assets:
Loan receivable	0	0
Recurring | Level 1 | Mortgage secured loans receivable
Assets:
Loan receivable	0	0
Recurring | Level 1 | Mezzanine loans receivable
Assets:
Loan receivable	0	0
Recurring | Level 2 | Mortgage Secured and Mezzanine Loans Receivable
Assets:
Loan receivable	0	0
Recurring | Level 2 | Mortgage secured loans receivable
Assets:
Loan receivable	0	0
Recurring | Level 2 | Mezzanine loans receivable
Assets:
Loan receivable	0	0
Recurring | Level 3 | Mortgage Secured and Mezzanine Loans Receivable
Assets:
Loan receivable	181,175	156,368
Recurring | Level 3 | Mortgage secured loans receivable
Assets:
Loan receivable	159,371	117,684
Recurring | Level 3 | Mezzanine loans receivable
Assets:
Loan receivable	$ 21,804	$ 38,684