INVESTMENTS - Schedule of Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ (494,870)	$ (178,130)	$ (510,294)	$ (100,958)
Additions to allowance for credit losses not previously recorded	(11,510)	(21,118)	(60,503)	(112,263)
Reductions for securities sold during the period	72,443		150,766
Additions to the allowance for credit losses arising from purchases				(3,246)
Additions (reductions) on securities with previous allowance	(3,548)	(58,053)	(18,047)	(43,576)
Write-offs charged against the allowance	211	4,810	804	7,109
Recoveries of amounts previously written off		(443)		0
Balance, end of period	(437,274)	(252,934)	(437,274)	(252,934)
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		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	(490,897)	(174,077)	(508,741)	(98,679)
Additions to allowance for credit losses not previously recorded	(11,510)	(21,118)	(57,630)	(112,263)
Reductions for securities sold during the period	72,443		150,766
Additions to the allowance for credit losses arising from purchases				0
Additions (reductions) on securities with previous allowance	(3,497)	(55,930)	(17,856)	(40,183)
Write-offs charged against the allowance	0	0	0	0
Recoveries of amounts previously written off		0		0
Balance, end of period	(433,461)	(251,125)	(433,461)	(251,125)
Other loans and receivables
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	(1,100)	(4,053)	(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		0
Additions to the allowance for credit losses arising from purchases				(3,246)
Additions (reductions) on securities with previous allowance	(51)	(2,123)	(191)	(3,393)
Write-offs charged against the allowance	211	4,810	804	7,109
Recoveries of amounts previously written off		(443)		0
Balance, end of period	$ (940)	$ (1,809)	$ (940)	$ (1,809)