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Borrowings - Schedule of Debt Obligations (Parenthetical) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Jun. 23, 2021
--- | --- | --- | ---
2018-2 Secured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instruments, net of discount | $ 1,226 | $ 1,403 |
4.875% Notes Due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instruments, net of discount | 1,704 | 2,157 | $ 2,430
Deferred financing costs, net | 818 | 951 |
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Deferred financing costs, net | $ 1,107 | $ 732 |

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