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Borrowings - Schedule of Debt Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Long-term debt	$ 363,802	$ 347,191
2018-2 Secured Notes
Debt Instrument [Line Items]
Long-term debt	162,593	162,460
4.875% Notes Due 2026
Debt Instrument [Line Items]
Long-term debt	105,301	104,892
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	$ 95,908	$ 79,839

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