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Fair Value of Financial Instruments - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details) $ in Thousands | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 USD ($) $ / shares
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value | $ 1,954,270 | [1] | $ 1,760,030 | [2]
Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value | 1,814,161 |  | 1,716,054 |
Level 3 | Senior secured first lien debt | Discounted Cash Flow | Discount Rates |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value | $ 1,354,388 |  | $ 1,471,816 |
Level 3 | Senior secured first lien debt | Discounted Cash Flow | Minimum | Discount Rates |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 0.085 |  | 0.065 |
Level 3 | Senior secured first lien debt | Discounted Cash Flow | Maximum | Discount Rates |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 0.325 |  | 0.340 |
Level 3 | Senior secured first lien debt | Discounted Cash Flow | Weighted Average | Discount Rates |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 0.138 |  | 0.147 |
Level 3 | Senior secured first lien debt | Broker Quotes | Broker Quotes |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value | $ 108,992 |  | $ 79,035 |
Level 3 | Senior secured first lien debt | Market Comparable Approach | EBITDA Multiple |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value | 27,867 |  | 3,552 |
Level 3 | Senior secured first lien debt | Market Comparable Approach | Revenue Multiple |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value | $ 72,229 |  | 20,050 |
Level 3 | Senior secured first lien debt | Market Comparable Approach | $ per kW |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value |  |  | $ 4,527 |
Measurement input | $ / shares |  |  | 131.85 |
Level 3 | Senior secured first lien debt | Market Comparable Approach | Minimum | EBITDA Multiple |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 9.00 |  | 2.75 |
Level 3 | Senior secured first lien debt | Market Comparable Approach | Minimum | Revenue Multiple |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 1.00 |  | 0.25 |
Level 3 | Senior secured first lien debt | Market Comparable Approach | Maximum | EBITDA Multiple |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 16.25 |  | 4.25 |
Level 3 | Senior secured first lien debt | Market Comparable Approach | Maximum | Revenue Multiple |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 2.50 |  | 1.7 |
Level 3 | Senior secured first lien debt | Market Comparable Approach | Weighted Average | EBITDA Multiple |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 14.35 |  | 4.09 |
Level 3 | Senior secured first lien debt | Market Comparable Approach | Weighted Average | Revenue Multiple |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 1.61 |  | 1.19 |
Level 3 | Senior secured first lien debt | Other Valuation Technique |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value | $ 1,695 |  | $ 532 |
Level 3 | Senior secured second lien debt | Discounted Cash Flow | Discount Rates |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value | $ 27,638 |  | $ 38,769 |
Level 3 | Senior secured second lien debt | Discounted Cash Flow | Minimum | Discount Rates |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 0.134 |  | 0.143 |
Level 3 | Senior secured second lien debt | Discounted Cash Flow | Maximum | Discount Rates |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 0.250 |  | 0.215 |
Level 3 | Senior secured second lien debt | Discounted Cash Flow | Weighted Average | Discount Rates |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 0.161 |  | 0.172 |
Level 3 | Senior secured second lien debt | Market Comparable Approach | Discount Rates |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value | $ 1,473 |  |  |
Measurement input | 9.00 |  |  |
Level 3 | Collateralized securities and structured products - equity | Discounted Cash Flow | Discount Rates |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value | $ 1,096 |  | $ 1,179 |
Measurement input |  |  | 0.210 |
Level 3 | Collateralized securities and structured products - equity | Discounted Cash Flow | Minimum | Discount Rates |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 0.054 |  |  |
Level 3 | Collateralized securities and structured products - equity | Discounted Cash Flow | Maximum | Discount Rates |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 0.210 |  |  |
Level 3 | Collateralized securities and structured products - equity | Discounted Cash Flow | Weighted Average | Discount Rates |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 0.207 |  |  |
Level 3 | Unsecured debt | Discounted Cash Flow | Discount Rates |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value | $ 8,739 |  | $ 7,327 |
Measurement input |  |  | 0.177 |
Level 3 | Unsecured debt | Discounted Cash Flow | Minimum | Discount Rates |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 0.160 |  |  |
Level 3 | Unsecured debt | Market Comparable Approach | EBITDA Multiple |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value |  |  | $ 15,316 |
Measurement input |  |  | 9.25 |
Level 3 | Unsecured debt | Other Valuation Technique |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value | $ 4,135 |  |  |
Level 3 | Equity | Discounted Cash Flow | Discount Rates |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value |  |  | $ 2,238 |
Level 3 | Equity | Discounted Cash Flow | Minimum | Discount Rates |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input |  |  | 0.168 |
Level 3 | Equity | Broker Quotes | Broker Quotes |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value | 971 |  | $ 1,234 |
Level 3 | Equity | Market Comparable Approach | EBITDA Multiple |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value | 90,771 |  | 33,441 |
Level 3 | Equity | Market Comparable Approach | Revenue Multiple |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value | 84,328 |  | 13,038 |
Level 3 | Equity | Market Comparable Approach | $ per kW |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value | $ 29,463 |  | $ 23,995 |
Measurement input | $ / shares |  |  | 412.5 |
Level 3 | Equity | Market Comparable Approach | Minimum | EBITDA Multiple |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 4.75 |  | 2.75 |
Level 3 | Equity | Market Comparable Approach | Minimum | Revenue Multiple |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 0.15 |  | 0.13 |
Level 3 | Equity | Market Comparable Approach | Minimum | $ per kW |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | $ / shares | 161.16 |  |  |
Level 3 | Equity | Market Comparable Approach | Maximum | EBITDA Multiple |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 17.25 |  | 14.55 |
Level 3 | Equity | Market Comparable Approach | Maximum | Revenue Multiple |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 6.50 |  | 5.75 |
Level 3 | Equity | Market Comparable Approach | Maximum | $ per kW |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | $ / shares | 400.00 |  |  |
Level 3 | Equity | Market Comparable Approach | Weighted Average | EBITDA Multiple |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 9.38 |  | 7.02 |
Level 3 | Equity | Market Comparable Approach | Weighted Average | Revenue Multiple |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 1.48 |  | 2.93 |
Level 3 | Equity | Market Comparable Approach | Weighted Average | $ per kW |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | $ / shares | 337.28 |  |  |
Level 3 | Equity | Options Pricing Model | Expected Volatility |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value | $ 376 |  | $ 5 |
Level 3 | Equity | Options Pricing Model | Minimum | Expected Volatility |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input | 1.150 |  | 0.800 |
Level 3 | Equity | Options Pricing Model | Maximum | Expected Volatility |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input |  |  | 0.900 |
Level 3 | Equity | Options Pricing Model | Weighted Average | Expected Volatility |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement input |  |  | 0.873 |
[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.
[2] | 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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