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Investments - Schedule of Valuation Techniques and Significant Inputs of Level III Investments (Details) - Level III $ in Thousands	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 478,236	$ 465,706
Debt securities | Recovery Rate Multiple | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	0.1
Debt securities | Enterprise Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 4,939	$ 24,513
Debt securities | Enterprise Value | Average EBITDA Multiple | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	0.4	0.0
Debt securities | Enterprise Value | Average EBITDA Multiple | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	6.4	8.0
Debt securities | Enterprise Value | Average EBITDA Multiple | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	4.0	4.3
Debt securities | Enterprise Value | Recovery Rate Multiple | Minimum
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	0.1
Debt securities | Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 1,800	$ 367,919
Debt securities | Income Approach | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	5.1	0
Debt securities | Income Approach | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	44.9	26.8
Debt securities | Income Approach | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	(13.3)	8.9
Debt securities | Recent Transaction | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 32,634
Debt securities | Recent Transaction | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	7.0
Debt securities | Recent Transaction | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	14.0
Debt securities | Recent Transaction | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	(9.5)
Equity Securities | Enterprise Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 20,626	$ 12,874
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 | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	12.4
Equity Securities | Enterprise Value | Average EBITDA Multiple / WACC | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	0.0	0.0
Equity Securities | Enterprise Value | Average EBITDA Multiple / WACC | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	15.5	12.5
Equity Securities | Enterprise Value | Average EBITDA Multiple / WACC | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	6.8	8.7
Equity Securities | Enterprise Value | Recovery Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	0.9
Equity Securities | Enterprise Value | Recovery Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	0.9
Equity Securities | Enterprise Value | Recovery Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	0.9
Equity Securities | Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 374,672	$ 8,118
Equity Securities | Income Approach | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	14.0	10.7
Equity Securities | Income Approach | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	15.0	18.8
Equity Securities | Income Approach | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	(14.8)	17.2
Equity Securities | Recent Transaction
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 744
Equity Securities | Recent Transaction | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	18.7
Equity Securities | Recent Transaction | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	(13.0)
CLO Fund Securities | Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 24,623	$ 31,632
CLO Fund Securities | Discounted Cash Flow | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	19.4	13.0
CLO Fund Securities | Discounted Cash Flow | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	25.6	20.1
CLO Fund Securities | Discounted Cash Flow | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	(22.5)	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	75.0	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	1.5	1.5
CLO Fund Securities | Discounted Cash Flow | Probability of Default | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	2.0	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	(1.8)	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	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	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	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 | Prepayment Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	25.0
Joint Ventures | Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 18,190	$ 23,062
Joint Ventures | Discounted Cash Flow | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	21.6	14.5
Joint Ventures | Discounted Cash Flow | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	23.2	16.0
Joint Ventures | Discounted Cash Flow | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	(22.4)	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	2.5	2.5
Joint Ventures | Discounted Cash Flow | Probability of Default | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	3.0	3.0
Joint Ventures | Discounted Cash Flow | Probability of Default | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	2.8	2.8
Joint Ventures | Discounted Cash Flow | Loss Severity | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	25.0	25.0
Joint Ventures | Discounted Cash Flow | Loss Severity | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range of Inputs	35.0	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	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
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 | Market Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of investments	$ 8	$ 2,412

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