INVESTMENTS - Marketable Securities (Details) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2025 USD ($) security	Dec. 31, 2024 USD ($) security
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding Face Amount	$ 237,459	$ 153,313
Carrying Value	$ 239,694	$ 163,489
Number of non rated securities \| security	12	6
Investment grade debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding Face Amount	$ 175,139	$ 121,278
Net Fair Value Adjustment	1,763	(102)
Carrying Value	176,902	121,176
Below investment grade debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding Face Amount	24,145	7,897
Net Fair Value Adjustment	339	(90)
Carrying Value	24,484	7,807
Residual interest securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding Face Amount	38,175	24,138
Net Fair Value Adjustment	133	10,368
Carrying Value	38,308	34,506
Marketable Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Fair Value Adjustment	$ 2,235	$ 10,176
Number of non rated securities \| security	15	11
Non-Rated Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding Face Amount	$ 20,400	$ 15,100
Interest-Only Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding Face Amount	$ 17,800	$ 9,100