INVESTMENTS IN LOANS AND SECURITIES - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ (100,958)	$ 0
Additions to allowance for credit losses not previously recorded	(2,965)	(68,347)
Additions to allowance for credit losses arising from purchases	(3,246)
Additions (reductions) on securities with previous allowance	(20,640)
Write-offs charged against the allowance	1,449	0
Balance at end of period	(126,360)	(68,347)
Securitization notes
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	0	0
Additions to allowance for credit losses not previously recorded	0	0
Additions to allowance for credit losses arising from purchases	0
Additions (reductions) on securities with previous allowance	0
Write-offs charged against the allowance	0
Balance at end of period	0	0
Securitization certificates
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	(98,679)	0
Additions to allowance for credit losses not previously recorded	(2,965)	(65,572)
Additions to allowance for credit losses arising from purchases	0
Additions (reductions) on securities with previous allowance	(19,705)
Write-offs charged against the allowance	0
Balance at end of period	(121,349)	(65,572)
Other loans and receivables
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	(2,279)	0
Additions to allowance for credit losses not previously recorded	0	(2,775)
Additions to allowance for credit losses arising from purchases	(3,246)
Additions (reductions) on securities with previous allowance	(935)
Write-offs charged against the allowance	1,449
Balance at end of period	$ (5,011)	$ (2,775)