INVESTMENTS - Schedule of Investments in Loans and Securities (Details) - USD ($) $ in Thousands		Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Allowance for Credit Losses		$ (437,274)	$ (494,870)	$ (510,294)	$ (252,934)	$ (178,130)	$ (100,958)
Investments in loans and securities	[1]	887,736		778,409
Accrued interest receivable		21,700		14,300
Securitization notes
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost		335,533		240,396
Gross Unrealized Gains		559		386
Gross Unrealized Non-Credit Related Adjustments		(53)		(509)
Allowance for Credit Losses		(2,873)	(2,873)	0	0	0	0
Investments in loans and securities		333,166		240,273
Securitization certificates
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost		979,623		1,048,734
Gross Unrealized Gains		11,759		7,926
Gross Unrealized Non-Credit Related Adjustments		(53,719)		(14,676)
Allowance for Credit Losses		(433,461)	$ (490,897)	(508,741)	$ (251,125)	$ (174,077)	$ (98,679)
Investments in loans and securities		$ 504,202		$ 533,243

[1] Accrued interest receivable of $14.3 million, previously reported within “Fee receivables” as of December 31, 2024, has been reclassified to “Investment in loans and securities” to conform to the current period’s presentation.