Borrowings - Schedule of Components of the Company's Interest Expense and Other Debt Financing Expenses, Average Debt Outstanding Balances and Average Stated Interest Rates (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Borrowings
Amortization of debt issuance costs	$ 2,156	$ 2,508	$ 7,298	$ 6,733
Total interest and other debt financing expenses	48,734	37,754	132,599	95,346
Average debt outstanding	$ 2,703,365	$ 1,852,615	$ 2,428,495	$ 1,542,805
Average stated interest rate	6.80%	7.60%	6.90%	7.70%
Interest expense - Revolving Credit Facility
Borrowings
Interest expense	$ 6,107	$ 4,898	$ 23,111	$ 16,029
Interest expense - SPV Credit Facility
Borrowings
Interest expense	4,295	7,534	12,442	18,210
Interest expense - SPV II Credit Facility
Borrowings
Interest expense	5,886	4,473	11,912	10,605
Interest expense - SPV III Credit Facility
Borrowings
Interest expense	3,137	1,322	7,474	2,310
Interest expense - SPV IV Credit Facility
Borrowings
Interest expense	5,346	2,478	15,283	2,478
Interest expense - SPV V Credit Facility
Borrowings
Interest expense	3,828	0	6,533	0
Interest expense - 2022 ABS
Borrowings
Interest expense	2,541	3,221	8,250	9,663
Interest expense - 2023 ABS
Borrowings
Interest expense	3,952	4,312	11,770	12,890
Interest expense - 2028 Notes
Borrowings
Interest expense	4,710	4,710	14,130	14,130
Interest expense - 2029 Notes
Borrowings
Interest expense	3,810	2,298	11,430	2,298
Interest expense - July 2028 Notes
Borrowings
Interest expense	586	0	586	0
Interest expense - July 2030 Notes
Borrowings
Interest expense	$ 2,380	$ 0	$ 2,380	$ 0