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Investments - Schedule of Valuation Techniques and Significant Inputs of Level III Investments (Details) - Level III $ in Thousands	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 396,582	$ 471,170
Debt securities | Enterprise Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 26,391	$ 10,142
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	7.8
Debt securities | Enterprise Value | Average EBITDA Multiple | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	9.5
Debt securities | Enterprise Value | Average EBITDA Multiple | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	7.8
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
Debt securities | Enterprise Value | Recovery Rate Multiple | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	0.1
Debt securities | Enterprise Value | Recovery Rate Multiple | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	0.4
Debt securities | Enterprise Value | Recovery Rate Multiple | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	0.3
Debt securities | Enterprise Value | Expected Sale Proceeds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	97.6
Debt securities | Enterprise Value | Average Settlement Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	47.1
Debt securities | Enterprise Value | Recovery Rate Agreement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	82.5
Debt securities | Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 318,992	$ 387,805
Debt securities | Income Approach | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	6	5.4
Debt securities | Income Approach | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	41.2	28.6
Debt securities | Income Approach | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	11.9	12.2
Debt securities | Recent Transaction
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 6,405	$ 12,197
Debt securities | Recent Transaction | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	10.9	11.9
Debt securities | Recent Transaction | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	14.6	13.2
Debt securities | Recent Transaction | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	12	13
Equity Securities | Enterprise Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 18,066	$ 20,221
Equity Securities | Enterprise Value | Average EBITDA Multiple | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	5.5
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	7.2
Equity Securities | Enterprise Value | Expected Sale Proceeds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	175
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	1.1	6.73
Equity Securities | Enterprise Value | Book Value of Equity | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	1
Equity Securities | Enterprise Value | Book Value of Equity | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	1.6
Equity Securities | Enterprise Value | Book Value of Equity | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	1.6
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	$ 451	$ 1,013
Equity Securities | Income Approach | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs		15
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	0.15	0.15
Equity Securities | Recent Transaction
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 672	$ 671
Equity Securities | Recent Transaction | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	12.4	0.124
CLO Fund Securities | Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 10,425	$ 20,453
CLO Fund Securities | Discounted Cash Flow | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	19.1	19.9
CLO Fund Securities | Discounted Cash Flow | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	25.9	25.5
CLO Fund Securities | Discounted Cash Flow | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	22.2	22.3
CLO Fund Securities | Discounted Cash Flow | Recovery Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	65	65
CLO Fund Securities | Discounted Cash Flow | Recovery Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	75	75
CLO Fund Securities | Discounted Cash Flow | Recovery Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	70	70
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	1.9
CLO Fund Securities | Discounted Cash Flow | Prepayment Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	15	15
CLO Fund Securities | Discounted Cash Flow | Prepayment Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	25	25
CLO Fund Securities | Discounted Cash Flow | Prepayment Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	20	20
Joint Ventures | Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 15,180	$ 18,668
Joint Ventures | Discounted Cash Flow | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	21.3	22.1
Joint Ventures | Discounted Cash Flow | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	22.9	23.7
Joint Ventures | Discounted Cash Flow | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	22.1	22.9
Joint Ventures | Discounted Cash Flow | Recovery Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	65	65
Joint Ventures | Discounted Cash Flow | Recovery Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	75	75
Joint Ventures | Discounted Cash Flow | Recovery Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	70	70
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	3
Joint Ventures | Discounted Cash Flow | Prepayment Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	15	15
Joint Ventures | Discounted Cash Flow | Prepayment Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	25	25
Joint Ventures | Discounted Cash Flow | Prepayment Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	20	20
Derivatives | Enterprise Value | Average EBITDA Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	2.5	3

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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