Borrowings - Schedule of Company's Outstanding Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Nov. 21, 2024	Sep. 15, 2023	Apr. 07, 2022
Borrowings
Total aggregate principal amount committed/ outstanding	$ 3,005,396	$ 2,656,207
Principal Amount Outstanding	2,249,256	2,151,713
Carrying Value	2,225,227	2,128,362
Unamortized Debt Issuance Costs	24,029	23,351
Revolving Credit Facility
Borrowings
Total aggregate principal amount committed/ outstanding	682,500	652,500
Principal Amount Outstanding	542,660	481,106
Carrying Value	536,587	474,756
Unamortized Debt Issuance Costs	6,073	6,350
SPV Credit Facility
Borrowings
Total aggregate principal amount committed/ outstanding	450,000	450,000
Principal Amount Outstanding	160,000	243,300
Carrying Value	156,827	239,889
Unamortized Debt Issuance Costs	3,173	3,411
SPV II Credit Facility
Borrowings
Total aggregate principal amount committed/ outstanding	176,527	195,998
Principal Amount Outstanding	176,527	195,998
Carrying Value	175,465	194,574
Unamortized Debt Issuance Costs	1,062	1,424
SPV III Credit Facility
Borrowings
Total aggregate principal amount committed/ outstanding	200,000	100,000
Principal Amount Outstanding	121,000	75,000
Carrying Value	119,129	73,722
Unamortized Debt Issuance Costs	1,871	1,278
SPV IV Credit Facility
Borrowings
Total aggregate principal amount committed/ outstanding	350,000	350,000
Principal Amount Outstanding	315,000	248,600
Carrying Value	311,823	245,185
Unamortized Debt Issuance Costs	3,177	3,415
SPV V Credit Facility
Borrowings
Total aggregate principal amount committed/ outstanding	250,000
Principal Amount Outstanding	37,700
Carrying Value	35,124	0
Unamortized Debt Issuance Costs	2,576
2022 ABS
Borrowings
Total aggregate principal amount committed/ outstanding	283,269	294,609			$ 425,000
Principal Amount Outstanding	283,269	294,609
Carrying Value	283,030	293,393
Unamortized Debt Issuance Costs	239	1,216
2022 Class C Notes
Borrowings
Carrying Value	33,442	34,780
2022 Subordinated Notes
Borrowings
Carrying Value	82,875	82,875
2023 ABS
Borrowings
Total aggregate principal amount committed/ outstanding	209,100	209,100		$ 251,169
Principal Amount Outstanding	209,100	209,100
Carrying Value	206,560	206,369
Unamortized Debt Issuance Costs	2,540	2,731
2028 Notes
Borrowings
Total aggregate principal amount committed/ outstanding	200,000	200,000
Principal Amount Outstanding	200,000	200,000
Carrying Value	198,294	198,178
Unamortized Debt Issuance Costs	1,706	1,822
2029 Notes
Borrowings
Total aggregate principal amount committed/ outstanding	204,000	204,000
Principal Amount Outstanding	204,000	204,000
Carrying Value	202,388	202,296
Unamortized Debt Issuance Costs	1,612	1,704
2023 Subordinated Notes
Borrowings
Total aggregate principal amount committed/ outstanding			$ 45,900	$ 65,319
Carrying Value	$ 45,900	$ 45,900