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Fair Value of Financial Instruments - Schedule of Portfolio Investments by Level in the Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | $ 1,819,835 |  | $ 1,729,264 |
Investments, at fair value: | 1,844,877 | [1] | 1,760,030 |
Controlled investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, at fair value: | 134,755 |  | 91,114 | $ 91,425
Controlled investments | CION/EagleTree Partners, LLC |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, at fair value: | 25,042 |  | 30,766 |
Senior secured first lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 1,481,498 |  | 1,579,512 |
Senior secured second lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 36,114 |  | 38,769 |
Collateralized securities and structured products - equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 1,224 |  | 1,179 |
Unsecured debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 14,631 |  | 22,643 |
Equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 169,434 |  | 76,292 |
Short term investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 116,934 |  | 10,869 |
Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 118,799 |  | 13,210 |
Level 1 | Senior secured first lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 |  | 0 |
Level 1 | Senior secured second lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 |  | 0 |
Level 1 | Collateralized securities and structured products - equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 |  | 0 |
Level 1 | Unsecured debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 |  | 0 |
Level 1 | Equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 1,865 |  | 2,341 |
Level 1 | Short term investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 116,934 |  | 10,869 |
Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 |  | 0 |
Level 2 | Senior secured first lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 |  | 0 |
Level 2 | Senior secured second lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 |  | 0 |
Level 2 | Collateralized securities and structured products - equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 |  | 0 |
Level 2 | Unsecured debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 |  | 0 |
Level 2 | Equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 |  | 0 |
Level 2 | Short term investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 |  | 0 |
Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 1,701,036 |  | 1,716,054 |
Investments, at fair value: | 1,701,037 |  | 1,716,054 |
Level 3 | Senior secured first lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 1,481,498 |  | 1,579,512 |
Level 3 | Senior secured second lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 36,114 |  | 38,769 |
Level 3 | Collateralized securities and structured products - equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 1,224 |  | 1,179 |
Level 3 | Unsecured debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 14,631 |  | 22,643 |
Level 3 | Equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 167,569 |  | 73,951 |
Level 3 | Short term investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | $ 0 |  | $ 0 |
[1] | Fair value determined in good faith by the Company’s board of directors (see Note 9), including via delegation to CIM as the Company’s valuation designee (see Note 2), using significant unobservable inputs unless otherwise noted.

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