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Borrowings - Schedule of Debt Obligations (Parenthetical) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Jun. 23, 2021
2018-2 Secured Notes
Debt Instrument [Line Items]
Debt instruments, net of discount	$ 712	$ 1,226
4.875% Notes Due 2026
Debt Instrument [Line Items]
Debt instruments, net of discount	1,225	1,704	$ 2,430
Deferred financing costs, net	561	818
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility
Debt Instrument [Line Items]
Deferred financing costs, net	$ 775	$ 1,107

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