INVESTMENTS - Investments by Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Amortized Cost
Within 1 year	$ 13,460	$ 22,091
Greater than 1 year, less than or equal to 5 years	1,236,211	1,273,485
Total	1,249,671	1,295,576
Fair Value
Within 1 year	19,665	22,087
Greater than 1 year, less than or equal to 5 years	740,828	756,322
Total	760,493	778,409
Accrued interest receivable	16,100	14,300
Securitization notes
Amortized Cost
Within 1 year	2,963	9,907
Greater than 1 year, less than or equal to 5 years	244,076	230,489
Total	247,039	240,396
Fair Value
Within 1 year	5,887	9,903
Greater than 1 year, less than or equal to 5 years	238,317	230,370
Total	244,204	240,273
Securitization certificates
Amortized Cost
Within 1 year	9,891	11,554
Greater than 1 year, less than or equal to 5 years	989,238	1,037,180
Total	999,129	1,048,734
Fair Value
Within 1 year	13,172	11,554
Greater than 1 year, less than or equal to 5 years	500,825	521,689
Total	513,997	533,243
Other loans and receivables
Amortized Cost
Within 1 year	606	630
Greater than 1 year, less than or equal to 5 years	2,897	5,816
Total	3,503	6,446
Fair Value
Within 1 year	606	630
Greater than 1 year, less than or equal to 5 years	1,686	4,263
Total	$ 2,292	$ 4,893