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Borrowings - Schedule of Debt Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Long-term debt	$ 288,863	$ 322,410
2018-2 Secured Notes
Debt Instrument [Line Items]
Long-term debt	91,151	124,971
4.875% Notes due 2026
Debt Instrument [Line Items]
Long-term debt	106,404	106,214
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	$ 91,308	$ 91,225

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