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Fair Value of Financial Instruments - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details)
Sep. 30, 2023
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
$ / shares
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 1,844,877,000 [1] $ 1,760,030,000
Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 1,701,037,000 1,716,054,000
Level 3 | Senior secured first lien debt | Discounted Cash Flow | Discount Rates    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 1,322,427,000 $ 1,471,816,000
Level 3 | Senior secured first lien debt | Discounted Cash Flow | Minimum | Discount Rates    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.075 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 0.141 0.147
Level 3 | Senior secured first lien debt | Broker Quotes | Broker Quotes    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 94,808,000 $ 79,035,000
Level 3 | Senior secured first lien debt | Market Comparable Approach | Revenue Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 55,002,000 20,050,000
Level 3 | Senior secured first lien debt | Market Comparable Approach | EBITDA Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value   3,552,000
Level 3 | Senior secured first lien debt | Market Comparable Approach | $ per kW    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 7,492,000 $ 4,527,000
Measurement input 161.16 131.85
Level 3 | Senior secured first lien debt | Market Comparable Approach | Minimum | Revenue Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 1.45 0.25
Level 3 | Senior secured first lien debt | Market Comparable Approach | Minimum | EBITDA Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input   2.75
Level 3 | Senior secured first lien debt | Market Comparable Approach | Maximum | Revenue Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 4.50 1.70
Level 3 | Senior secured first lien debt | Market Comparable Approach | Maximum | EBITDA Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input   4.25
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 2.39 1.19
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   4.09
Level 3 | Senior secured first lien debt | Other Valuation Technique    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 1,770,000 $ 532,000
Level 3 | Senior secured second lien debt | Discounted Cash Flow | Discount Rates    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 27,878,000 $ 38,769,000
Level 3 | Senior secured second lien debt | Discounted Cash Flow | Minimum | Discount Rates    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.135 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 0.158 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 0.154 0.172
Level 3 | Senior secured second lien debt | Market Comparable Approach | EBITDA Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 8,237,000  
Measurement input 10.00  
Level 3 | Collateralized securities and structured products - equity | Discounted Cash Flow | Discount Rates    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 1,224,000 $ 1,179,000
Measurement input 0.210 0.210
Level 3 | Unsecured debt | Discounted Cash Flow | Discount Rates    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 7,423,000 $ 7,327,000
Measurement input   0.177
Level 3 | Unsecured debt | Discounted Cash Flow | Maximum | Discount Rates    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.165  
Level 3 | Unsecured debt | Broker Quotes | Broker Quotes    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 3,010,000  
Level 3 | Unsecured debt | Market Comparable Approach | EBITDA Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 4,198,000 $ 15,316,000
Measurement input 6.50 9.25
Level 3 | Equity | Discounted Cash Flow | Discount Rates    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value   $ 2,238,000
Measurement input   0.168
Level 3 | Equity | Broker Quotes | Broker Quotes    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 776,000 $ 1,234,000
Level 3 | Equity | Market Comparable Approach | Revenue Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 63,919,000 13,038,000
Level 3 | Equity | Market Comparable Approach | EBITDA Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 80,754,000 33,441,000
Level 3 | Equity | Market Comparable Approach | $ per kW    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 21,863,000 $ 23,995,000
Measurement input | $ / shares 400.00 412.5
Level 3 | Equity | Market Comparable Approach | Minimum | Revenue Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.13 0.13
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 | Maximum | Revenue Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 6.00 5.75
Level 3 | Equity | Market Comparable Approach | Maximum | EBITDA Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 14.75 14.55
Level 3 | Equity | Market Comparable Approach | Weighted Average | Revenue Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.68 2.93
Level 3 | Equity | Market Comparable Approach | Weighted Average | EBITDA Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 9.57 7.02
Level 3 | Equity | Options Pricing Model | Expected Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 257,000 $ 5,000
Level 3 | Equity | Options Pricing Model | Minimum | Expected Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 1.050 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.