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Investments - Schedule of Valuation Techniques and Significant Inputs of Level III Investments (Details) - Level III $ in Thousands	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 406,576	$ 471,170
Debt securities | Enterprise Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 12,455	$ 10,142
Debt securities | Enterprise Value | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	98.8
Debt securities | Enterprise Value | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	120.0
Debt securities | Enterprise Value | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	108.4
Debt securities | Enterprise Value | Average EBITDA Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	7.0	14.5
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 | 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	$ 327,829	$ 387,805
Debt securities | Income Approach | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	5.7	5.4
Debt securities | Income Approach | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	123.6	28.6
Debt securities | Income Approach | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	12.0	12.2
Debt securities | Waterfall Analysis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 12,090
Debt securities | Waterfall Analysis | Average EBITDA Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	7.0
Debt securities | Waterfall Analysis | Average Revenue Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	0.35
Debt securities | Recent Transaction
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments		$ 12,197
Debt securities | Recent Transaction | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 4,619
Range of Inputs	13.0
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	$ 12,208	$ 20,221
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	17.3
Equity Securities | Enterprise Value | Average EBITDA Multiple | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	5.15
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	1.06	6.73
Equity Securities | Enterprise Value | Book Value of Equity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	1.0
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	$ 536	$ 1,013
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 | Waterfall Analysis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 6,340
Equity Securities | Waterfall Analysis | Average EBITDA Multiple | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	4.8
Equity Securities | Waterfall Analysis | Average EBITDA Multiple | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	7
Equity Securities | Waterfall Analysis | Average EBITDA Multiple | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	5.59
Equity Securities | Recent Transaction
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 929	$ 671
Equity Securities | Recent Transaction | Average Revenue Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	8.5
Equity Securities | Recent Transaction | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	12.4	0.1240
CLO Fund Securities | Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 12,996	$ 20,453
CLO Fund Securities | Discounted Cash Flow | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	20.2	19.9
CLO Fund Securities | Discounted Cash Flow | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	26.0	25.5
CLO Fund Securities | Discounted Cash Flow | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	22.5	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	$ 16,574	$ 18,668
Joint Ventures | Discounted Cash Flow | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	22.5	22.1
Joint Ventures | Discounted Cash Flow | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	24.1	23.7
Joint Ventures | Discounted Cash Flow | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	23.3	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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