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Commitment and Contingencies (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Delayed Draw and Revolving Senior Secured Loans      
Financial Support for Nonconsolidated Legal Entity [Line Items]      
Unfunded commitments $ 287,164 $ 314,251 $ 509,403
Financial Support, Capital Contributions      
Financial Support for Nonconsolidated Legal Entity [Line Items]      
Unfunded commitments   $ 220,271 $ 425,694