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Investments - Schedule of Valuation Techniques and Significant Inputs of Level III Investments (Details) - Level III $ in Thousands | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of investments | $ 471,170 | $ 465,706
Debt securities | Enterprise Value |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of investments | $ 10,142 | $ 24,513
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 |  | 0.0
Debt securities | Enterprise Value | Average EBITDA Multiple | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 8.0
Debt securities | Enterprise Value | Average EBITDA Multiple | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 4.3
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 | Enterprise Value | Recovery Rate Multiple | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 0.1
Debt securities | Enterprise Value | Recovery Rate Multiple | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 0.1
Debt securities | Enterprise Value | Average Revenue Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 0.3 |
Debt securities | Income Approach |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of investments | $ 387,805 | $ 367,919
Debt securities | Income Approach | Discount Rate | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 5.4 | 0
Debt securities | Income Approach | Discount Rate | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 28.6 | 26.8
Debt securities | Income Approach | Discount Rate | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 12.2 | 8.9
Debt securities | Recent Transaction | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of investments | $ 12,197 |
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 | $ 20,221 | $ 12,874
Equity Securities | Enterprise Value | Average EBITDA Multiple | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 0.0
Equity Securities | Enterprise Value | Average EBITDA Multiple | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 12.5
Equity Securities | Enterprise Value | Average EBITDA Multiple | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 8.7
Equity Securities | Enterprise Value | Recovery Rate Multiple | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 0.0
Equity Securities | Enterprise Value | Recovery Rate Multiple | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 0.0
Equity Securities | Enterprise Value | Recovery Rate Multiple | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 0.0
Equity Securities | Enterprise Value | Average EBITDA Multiple / WACC | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 0.4 |
Equity Securities | Enterprise Value | Average EBITDA Multiple / WACC | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 15.8 |
Equity Securities | Enterprise Value | Average EBITDA Multiple / WACC | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 6.73 |
Equity Securities | Enterprise Value | Recovery Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 0.3 |
Equity Securities | Income Approach |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of investments | $ 1,013 | $ 8,118
Equity Securities | Income Approach | Discount Rate | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 15.0 | 10.7
Equity Securities | Income Approach | Discount Rate | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 19.3 | 18.8
Equity Securities | Income Approach | Discount Rate | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 15.0 | 17.2
Equity Securities | Recent Transaction |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of investments | $ 671 |
Equity Securities | Recent Transaction | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 12.40 |
CLO Fund Securities | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of investments | $ 20,453 | $ 31,632
CLO Fund Securities | Discounted Cash Flow | Discount Rate | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 19.9 | 13.0
CLO Fund Securities | Discounted Cash Flow | Discount Rate | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 25.5 | 20.1
CLO Fund Securities | Discounted Cash Flow | Discount Rate | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 22.3 | 16.6
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 | 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 | 1.5 | 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 | 2.0
CLO Fund Securities | Discounted Cash Flow | Probability of Default | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 1.9 | 1.8
CLO Fund Securities | Discounted Cash Flow | Loss Severity | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 25.0
CLO Fund Securities | Discounted Cash Flow | Loss Severity | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 35.0
CLO Fund Securities | Discounted Cash Flow | Loss Severity | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 30.0
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 | $ 18,668 | $ 23,062
Joint Ventures | Discounted Cash Flow | Discount Rate | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 22.1 | 14.5
Joint Ventures | Discounted Cash Flow | Discount Rate | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 23.7 | 16.0
Joint Ventures | Discounted Cash Flow | Discount Rate | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 22.9 | 15.3
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 | 2.5
Joint Ventures | Discounted Cash Flow | Probability of Default | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 3.3 | 3.0
Joint Ventures | Discounted Cash Flow | Probability of Default | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs | 3 | 2.8
Joint Ventures | Discounted Cash Flow | Loss Severity | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 25.0
Joint Ventures | Discounted Cash Flow | Loss Severity | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 35.0
Joint Ventures | Discounted Cash Flow | Loss Severity | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range of Inputs |  | 30.0
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 |
Derivatives | Market Approach |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of investments |  | $ 2,412

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