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Borrowings - Schedule of Debt Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term debt	$ 317,806	$ 373,308
2018-2 Secured Notes
Debt Instrument [Line Items]
Long-term debt	138,638	176,937
4.875% Notes Due 2026
Debt Instrument [Line Items]
Long-term debt	106,026	105,478
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	$ 73,142	$ 90,893

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