MORTGAGE LOAN RECEIVABLES - Provision for Loan Losses (Details) $ in Thousands		12 Months Ended
	Jan. 01, 2020 USD ($)	Dec. 31, 2022 USD ($) loans security	Dec. 31, 2021 USD ($) security loans	Dec. 31, 2020 USD ($)	Jun. 27, 2022 USD ($)	Dec. 31, 2018 USD ($)
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses at beginning of period	$ 20,500	$ 31,752	$ 41,507	$ 20,500
Provision for current expected credit loss	5,800
Provision for (release of) current expected credit loss, net		6,503	(8,605)	18,543
Foreclosure of loans subject to asset-specific reserve		0	(1,150)	(2,500)
Charge-offs		(14,395)	0	0
Recoveries		(3,105)	0	0
Allowance for credit losses at end of period		20,755	31,752	41,507
Provision for (release of) loan loss reserves, net		14,395		18,275
Additional asset-specific reserve				9,200
Principal balance of loans on non-accrual status		53,809	80,229
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	20,500	31,752	41,507	20,500
Charge-offs		(14,395)
Allowance for credit losses at end of period		20,755	31,752	41,507
Held-to-maturity Securities
Allowance for Loan and Lease Losses [Roll Forward]
Unfunded commitments of mortgage loan receivables held for investment	800
Provision for (release of) loan loss reserves, net	$ 22
Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Provision for current expected credit loss		0	0	$ 4,964
Asset Specific Reserve, Company Loan
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses at end of period		2,700
Provision for (release of) loan loss reserves, net		6,500
Additional asset-specific reserve		$ 0	0
Number or loans in default | loans		2
Two Company Loans | 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		$ 23,300	$ 24,200
Number or loans in default | loans		2	2
One Of Company Loans 2 | 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	$ 30,500
Number or loans in default | security		1	1
Two Of Company Loans 1 | 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			$ 25,600		$ 24,600	$ 45,000
Number or loans in default | loans			2