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MORTGAGE LOAN RECEIVABLES - Provision for Loan Losses (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($) loans	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) loans
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses at beginning of period	$ 20,755	$ 31,752	$ 31,752
Provision for (release of) current expected credit loss, net	4,744	580
Allowance for credit losses at end of period	25,499	32,332	20,755
Principal balance of loans on non-accrual status	53,624		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	31,752
Allowance for credit losses at end of period	25,499	32,332	20,755
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		$ 2,700
Additional asset-specific reserve	$ 0	$ 0
Number or loans in default | loans	2		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

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- Definition

Financing Receivable, Excluding Accrued Interest, Credit Loss, Expense (Reversal), Asset-Specific Reserve

+ References

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- Definition

Financing Receivable Recorded Investment, Excluding Accrued Interest, Nonaccrual Loans

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable from change in methodology. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 11
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919244-210447

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- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447

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