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Investments - Schedule of Valuation Techniques and Significant Inputs of Level III Investments (Details) - Level III | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of investments | $ 440,126,000 | $ 471,170,000
Debt securities | Enterprise Value |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of investments | $ 32,150,000 | $ 10,142,000
Debt securities | Enterprise Value | Average EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 14.5
Debt securities | Enterprise Value | Average EBITDA Multiple | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 8 |
Debt securities | Enterprise Value | Average EBITDA Multiple | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 8.5 |
Debt securities | Enterprise Value | Average EBITDA Multiple | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 8.09 |
Debt securities | Enterprise Value | Expected Sale Proceeds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 129.60 |
Debt securities | Enterprise Value | Average Revenue Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 0.3
Debt securities | Enterprise Value | Average Revenue Multiple | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 0.3 |
Debt securities | Enterprise Value | Average Revenue Multiple | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 0.8 |
Debt securities | Enterprise Value | Average Revenue Multiple | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 0.7 |
Debt securities | Enterprise Value | Recovery Rate Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 0.1 | 0.1
Debt securities | Income Approach |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of investments | $ 752,000 | $ 387,805,000
Debt securities | Income Approach | Discount Rate | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 5.1 | 5.4
Debt securities | Income Approach | Discount Rate | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 41.3 | 28.6
Debt securities | Income Approach | Discount Rate | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 11.4 | 12.2
Debt securities | Recent Transaction |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of investments |  | $ 12,197,000
Debt securities | Recent Transaction | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of investments | $ 6,988,000 |
Range of Inputs | 35 |
Debt securities | Recent Transaction | Discount Rate | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 11.9
Debt securities | Recent Transaction | Discount Rate | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 13.2
Debt securities | Recent Transaction | Discount Rate | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 13.0
Equity Securities | Enterprise Value |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of investments | $ 13,897,000 | $ 20,221,000
Equity Securities | Enterprise Value | Average EBITDA Multiple | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 1.6 |
Equity Securities | Enterprise Value | Average EBITDA Multiple | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 15.8 |
Equity Securities | Enterprise Value | Average EBITDA Multiple | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 5.12 |
Equity Securities | Enterprise Value | Average Revenue Multiple | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 0.8 |
Equity Securities | Enterprise Value | Average Revenue Multiple | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 1.9 |
Equity Securities | Enterprise Value | Average Revenue Multiple | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 1.9 |
Equity Securities | Enterprise Value | Average EBITDA Multiple / WACC | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 0.4 | 0.4
Equity Securities | Enterprise Value | Average EBITDA Multiple / WACC | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 3.7 | 15.8
Equity Securities | Enterprise Value | Average EBITDA Multiple / WACC | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 0.84 | 6.73
Equity Securities | Enterprise Value | Recovery Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 0.3 | 0.3
Equity Securities | Income Approach |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of investments | $ 350,351,000 | $ 1,013,000
Equity Securities | Income Approach | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 15.0 |
Equity Securities | Income Approach | Discount Rate | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 15.0
Equity Securities | Income Approach | Discount Rate | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 0.193
Equity Securities | Income Approach | Discount Rate | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 0.150
Equity Securities | Recent Transaction |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of investments | $ 671,000 | $ 671,000
Equity Securities | Recent Transaction | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 12.40 | 0.1240
CLO Fund Securities | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of investments | $ 19,241,000 | $ 20,453,000
CLO Fund Securities | Discounted Cash Flow | Discount Rate | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 19.3 | 19.9
CLO Fund Securities | Discounted Cash Flow | Discount Rate | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 25.4 | 25.5
CLO Fund Securities | Discounted Cash Flow | Discount Rate | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 22.1 | 22.3
CLO Fund Securities | Discounted Cash Flow | Recovery Rate | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 65.0 | 65.0
CLO Fund Securities | Discounted Cash Flow | Recovery Rate | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 75.0 | 75.0
CLO Fund Securities | Discounted Cash Flow | Recovery Rate | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 70.0 | 70.0
CLO Fund Securities | Discounted Cash Flow | Probability of Default | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 1.8 | 1.5
CLO Fund Securities | Discounted Cash Flow | Probability of Default | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 2.5 | 2.5
CLO Fund Securities | Discounted Cash Flow | Probability of Default | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 2.0 | 1.9
CLO Fund Securities | Discounted Cash Flow | Prepayment Rate | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 15.0 | 15.0
CLO Fund Securities | Discounted Cash Flow | Prepayment Rate | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 25.0 | 25.0
CLO Fund Securities | Discounted Cash Flow | Prepayment Rate | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 20.0 | 20.0
Joint Ventures | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of investments | $ 16,076,000 | $ 18,668,000
Joint Ventures | Discounted Cash Flow | Discount Rate | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 21.8 | 22.1
Joint Ventures | Discounted Cash Flow | Discount Rate | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 23.4 | 23.7
Joint Ventures | Discounted Cash Flow | Discount Rate | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 22.6 | 22.9
Joint Ventures | Discounted Cash Flow | Recovery Rate | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 65.0 | 65.0
Joint Ventures | Discounted Cash Flow | Recovery Rate | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 75.0 | 75.0
Joint Ventures | Discounted Cash Flow | Recovery Rate | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 70.0 | 70.0
Joint Ventures | Discounted Cash Flow | Probability of Default | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 2.8 | 2.8
Joint Ventures | Discounted Cash Flow | Probability of Default | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 3.3 | 3.3
Joint Ventures | Discounted Cash Flow | Probability of Default | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 3.0 | 3
Joint Ventures | Discounted Cash Flow | Prepayment Rate | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 15.0 | 15.0
Joint Ventures | Discounted Cash Flow | Prepayment Rate | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 25.0 | 25.0
Joint Ventures | Discounted Cash Flow | Prepayment Rate | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 20.0 | 20.0
Derivatives | Enterprise Value | Average EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 3.0 | 3.0

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