MORTGAGE LOAN RECEIVABLES - Provision for Loan Losses (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) loans	Dec. 31, 2022 USD ($) loans	Dec. 31, 2021 USD ($)
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses at beginning of period	$ 20,755	$ 31,752	$ 41,507
Provision for (release of) current expected credit loss, net	25,110	6,503	(8,605)
Foreclosure of loans subject to asset-specific reserve	0	0	(1,150)
Charge-offs	(2,700)	(14,395)	0
Recoveries	0	(3,105)	0
Allowance for credit losses at end of period	43,165	20,755	31,752
Principal balance of loans on non-accrual status	14,541	53,809
Total mortgage loan receivables held for investment, net, at amortized cost
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses at beginning of period	20,755	31,752	41,507
Charge-offs	(2,700)	(14,395)
Allowance for credit losses at end of period	43,165	20,755	31,752
Asset Specific Reserve, Company Loan
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses at beginning of period	2,700
Allowance for credit losses at end of period		2,700
Additional asset-specific reserve	0	$ 0	$ 0
Number or loans in default | loans		2
One loan | Total mortgage loan receivables held for investment, net, at amortized cost
Allowance for Loan and Lease Losses [Roll Forward]
Principal balance of loans on non-accrual status	$ 14,500
Number or loans in default | loans	1
Two Of Company Loans, Retail
Allowance for Loan and Lease Losses [Roll Forward]
Asset-specific reserves	$ 2,700
Two Of Company Loans, Retail | Total mortgage loan receivables held for investment, net, at amortized cost
Allowance for Loan and Lease Losses [Roll Forward]
Principal balance of loans on non-accrual status	$ 26,000
Number or loans in default | loans	2
One loan | Total mortgage loan receivables held for investment, net, at amortized cost
Allowance for Loan and Lease Losses [Roll Forward]
Principal balance of loans on non-accrual status	$ 30,500
Number or loans in default | loans	1