INVESTMENTS IN LOANS AND SECURITIES - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ (126,360)	$ (68,347)	$ (100,958)	$ 0
Additions to allowance for credit losses not previously recorded	(23,628)	(12,643)	(26,593)	(85,613)
Additions to allowance for credit losses arising from purchases	0		(3,246)
Additions (reductions) on securities with previous allowance	(29,434)		(50,074)
Write-offs charged against the allowance	850	2,663	2,299	7,286
Recoveries of amounts previously written off			442
Balance at end of period	(178,130)	(78,327)	(178,130)	(78,327)
Securitization notes
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	0	0	0	0
Additions to allowance for credit losses not previously recorded	0	0	0	0
Additions to allowance for credit losses arising from purchases	0		0
Additions (reductions) on securities with previous allowance	0		0
Write-offs charged against the allowance	0	0	0	0
Recoveries of amounts previously written off			0
Balance at end of period	0	0	0	0
Securitization certificates
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	(121,349)	(65,572)	(98,679)	0
Additions to allowance for credit losses not previously recorded	(23,628)	(8,715)	(26,593)	(74,287)
Additions to allowance for credit losses arising from purchases	0		0
Additions (reductions) on securities with previous allowance	(29,100)		(48,805)
Write-offs charged against the allowance	0	0	0	0
Recoveries of amounts previously written off			0
Balance at end of period	(174,077)	(74,287)	(174,077)	(74,287)
Other loans and receivables
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	(5,011)	(2,775)	(2,279)	0
Additions to allowance for credit losses not previously recorded	0	(3,928)	0	(11,326)
Additions to allowance for credit losses arising from purchases	0		(3,246)
Additions (reductions) on securities with previous allowance	(334)		(1,269)
Write-offs charged against the allowance	850	2,663	2,299	7,286
Recoveries of amounts previously written off			442
Balance at end of period	$ (4,053)	$ (4,040)	$ (4,053)	$ (4,040)