Debt - Schedule of 2019 1 Debt (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022	Nov. 30, 2021
Debt
Principal amount	$ 1,617,500	$ 1,667,500
Class A1R senior secured floating rate notes
Debt
Principal amount	$ 282,500		$ 282,500
Spread rate (as a percent)	1.50%
Interest rate (as a percent)	6.76%		1.50%
Class A2R senior secured floating rate notes
Debt
Principal amount	$ 55,000		$ 55,000
Spread rate (as a percent)	2.00%
Interest rate (as a percent)	7.26%		2.00%
Class BR senior deferrable floating rate notes
Debt
Principal amount	$ 15,000		$ 47,500
Spread rate (as a percent)	2.60%
Interest rate (as a percent)	7.86%		2.60%
2019-1 Notes
Debt
Principal amount	$ 352,500	$ 352,500	$ 410,000
2019-1 CLO Reset Notes
Debt
Principal amount	454,750
Membership interests	$ 102,250