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Fair Value of Financial Instruments - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
$ / shares
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 1,870,837 [1] $ 1,954,270 [2]
Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 1,719,718 1,814,161
Level 3 | Senior secured first lien debt | Discounted Cash Flow | Discount Rates    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 1,298,569 $ 1,354,388
Level 3 | Senior secured first lien debt | Discounted Cash Flow | Minimum | Discount Rates    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.099 0.085
Level 3 | Senior secured first lien debt | Discounted Cash Flow | Maximum | Discount Rates    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.318 0.325
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 0.140 0.138
Level 3 | Senior secured first lien debt | Broker Quotes | Broker Quotes    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 81,220 $ 108,992
Level 3 | Senior secured first lien debt | Market Comparable Approach | Revenue Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 72,822 72,229
Level 3 | Senior secured first lien debt | Market Comparable Approach | EBITDA Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 11,057 $ 27,867
Measurement input 5.63  
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 1.00
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
Level 3 | Senior secured first lien debt | Market Comparable Approach | Maximum | Revenue Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 3.00 2.50
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
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 1.77 1.61
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
Level 3 | Senior secured first lien debt | Other Valuation Technique    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 1,383 $ 1,695
Level 3 | Senior secured second lien debt | Discounted Cash Flow | Discount Rates    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 26,066 $ 27,638
Level 3 | Senior secured second lien debt | Discounted Cash Flow | Minimum | Discount Rates    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.130 0.134
Level 3 | Senior secured second lien debt | Discounted Cash Flow | Maximum | Discount Rates    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.155 0.250
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 0.143 0.161
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 | $ / shares   9.00
Level 3 | Senior secured second lien debt | Market Comparable Approach | EBITDA Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 2,394  
Measurement input 5.88  
Level 3 | Collateralized securities and structured products - equity | Discounted Cash Flow | Discount Rates    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 1,004 $ 1,096
Measurement input 0.210 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 $ 1,371 $ 8,739
Measurement input 0.120 0.160
Level 3 | Unsecured debt | Market Comparable Approach | EBITDA Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value   $ 4,135
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 $ 6,666  
Measurement input 0.200  
Level 3 | Equity | Broker Quotes | Broker Quotes    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 971 971
Level 3 | Equity | Market Comparable Approach | Revenue Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 83,735 84,328
Level 3 | Equity | Market Comparable Approach | EBITDA Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 96,108 90,771
Level 3 | Equity | Market Comparable Approach | $ per kW    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 28,198 $ 29,463
Measurement input | $ / shares   161.16
Level 3 | Equity | Market Comparable Approach | Minimum | Revenue Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.18 0.15
Level 3 | Equity | Market Comparable Approach | Minimum | EBITDA Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 4.75 4.75
Level 3 | Equity | Market Comparable Approach | Minimum | $ per kW    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input | $ / shares 162.5  
Level 3 | Equity | Market Comparable Approach | Maximum | Revenue Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 6.75 6.50
Level 3 | Equity | Market Comparable Approach | Maximum | EBITDA Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 17.25 17.25
Level 3 | Equity | Market Comparable Approach | Maximum | $ per kW    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 437.5 400
Level 3 | Equity | Market Comparable Approach | Weighted Average | Revenue Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.52 1.48
Level 3 | Equity | Market Comparable Approach | Weighted Average | EBITDA Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 10.47 9.38
Level 3 | Equity | Market Comparable Approach | Weighted Average | $ per kW    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 361.5 337.28
Level 3 | Equity | Other Valuation Technique    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 1,306  
Level 3 | Equity | Options Pricing Model | Expected Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 2,713 $ 376
Level 3 | Equity | Options Pricing Model | Minimum | Expected Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.450 1.150
Level 3 | Equity | Options Pricing Model | Maximum | Expected Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 1.000  
Level 3 | Equity | Options Pricing Model | Weighted Average | Expected Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.710  
[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.