INVESTMENTS - Schedule of Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ (466,520)	$ (126,360)	$ (510,294)	$ (100,958)
Additions to allowance for credit losses not previously recorded	(22,594)	(23,628)	(49,025)	(26,593)
Reductions for securities sold during the period			78,355
Additions to the allowance for credit losses arising from purchases				(3,246)
Additions (reductions) on securities with previous allowance	(5,912)	(29,434)	(14,498)	(50,074)
Write-offs charged against the allowance	157	850	593	2,299
Recoveries of amounts previously written off		442		442
Balance, end of period	(494,869)	(178,130)	(494,869)	(178,130)
Securitization notes
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	(2,873)	0	0	0
Additions to allowance for credit losses not previously recorded	0	0	(2,873)	0
Reductions for securities sold during the period			0
Additions to the allowance for credit losses arising from purchases				0
Additions (reductions) on securities with previous allowance	0	0	0	0
Write-offs charged against the allowance	0	0	0	0
Recoveries of amounts previously written off		0		0
Balance, end of period	(2,873)	0	(2,873)	0
Securitization certificates
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	(462,436)	(121,349)	(508,741)	(98,679)
Additions to allowance for credit losses not previously recorded	(22,594)	(23,628)	(46,152)	(26,593)
Reductions for securities sold during the period			78,355
Additions to the allowance for credit losses arising from purchases				0
Additions (reductions) on securities with previous allowance	(5,866)	(29,100)	(14,358)	(48,805)
Write-offs charged against the allowance	0	0	0	0
Recoveries of amounts previously written off		0		0
Balance, end of period	(490,896)	(174,077)	(490,896)	(174,077)
Other loans and receivables
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	(1,211)	(5,011)	(1,553)	(2,279)
Additions to allowance for credit losses not previously recorded	0	0	0	0
Reductions for securities sold during the period			0
Additions to the allowance for credit losses arising from purchases				(3,246)
Additions (reductions) on securities with previous allowance	(46)	(334)	(140)	(1,269)
Write-offs charged against the allowance	157	850	593	2,299
Recoveries of amounts previously written off		442		442
Balance, end of period	$ (1,100)	$ (4,053)	$ (1,100)	$ (4,053)