Fair Value Measurement - Ranges of Significant Unobservable Inputs to Value Level 3 Assets (Details) $ in Thousands		Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value		$ 301,084	$ 412,144
Level 3
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value		136,377	154,024
Debt
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value		184,955	149,794
Debt | Level 3
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value		104,333	104,936
Debt | Level 3 | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value	[1]		83,321
Debt | Level 3 | Income Approach | Implied Yield
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value	[1]	4,945	(288)
Debt | Level 3 | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value	[1]		20,070
Debt | Level 3 | Asset Recovery Liquidation Valuation Technique
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value	[1],[2]	873
Debt | Level 3 | Broker Quotes
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value	[1]	4,883
Debt | Level 3 | Recent Transaction
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value	[1]	$ 4,375	$ 1,833
Debt | Level 3 | Options Pricing Model | Volatility
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.2000
Debt | Level 3 | Options Pricing Model | Risk Free Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.0449
Debt | Level 3 | Minimum | Income Approach | Implied Yield
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.0395	0.0402
Debt | Level 3 | Minimum | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]		1.00
Debt | Level 3 | Minimum | Broker Quotes
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.8000
Debt | Level 3 | Maximum | Income Approach | Implied Yield
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.2649	0.0687
Debt | Level 3 | Maximum | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]		5.25
Debt | Level 3 | Maximum | Broker Quotes
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.8500
Debt | Level 3 | Weighted Average | Income Approach | Implied Yield
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.1580	0.0497
Debt | Level 3 | Weighted Average | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]		3.28
Debt | Level 3 | Weighted Average | Broker Quotes
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.8250
Debt | Level 3 | Debt Instrument Three | Minimum | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]		0.1750
Debt | Level 3 | Debt Instrument Three | Maximum | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]		0.3250
Debt | Level 3 | Debt Instrument Three | Weighted Average | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]		0.2768
Debt | Level 3 | Debt Instrument Four | Minimum | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]		0.0705
Debt | Level 3 | Debt Instrument Four | Maximum | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]		0.6541
Debt | Level 3 | Debt Instrument Four | Weighted Average | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]		0.1316
Debt | Debt Instrument One | Level 3 | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value	[1]	$ 65,570
Debt | Debt Instrument One | Level 3 | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value	[1]	$ 20,687
Debt | Debt Instrument One | Level 3 | Minimum | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.0939
Debt | Debt Instrument One | Level 3 | Minimum | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.25
Debt | Debt Instrument One | Level 3 | Maximum | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.3361
Debt | Debt Instrument One | Level 3 | Maximum | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	9.50
Debt | Debt Instrument One | Level 3 | Weighted Average | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.1755
Debt | Debt Instrument One | Level 3 | Weighted Average | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.0420
Debt | Debt Instrument Two | Level 3 | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value	[1]	$ 3,000
Debt | Debt Instrument Two | Level 3 | Minimum | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.2400
Debt | Debt Instrument Two | Level 3 | Minimum | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	4.00
Debt | Debt Instrument Two | Level 3 | Maximum | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.2600
Debt | Debt Instrument Two | Level 3 | Maximum | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	5.00
Debt | Debt Instrument Two | Level 3 | Weighted Average | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.2500
Debt | Debt Instrument Two | Level 3 | Weighted Average | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	4.50
Equity/Other
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value		$ 40,002	$ 62,355
Equity/Other | Level 3
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value		32,044	49,088
Equity/Other | Level 3 | Equity Funds One | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value	[1]	$ 11,638
Equity/Other | Level 3 | Equity Funds One | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value	[1]		$ 31,050
Equity/Other | Level 3 | Equity Funds One | Minimum | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.2400
Equity/Other | Level 3 | Equity Funds One | Minimum | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]		0.16
Equity/Other | Level 3 | Equity Funds One | Maximum | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.2600
Equity/Other | Level 3 | Equity Funds One | Maximum | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]		14.50
Equity/Other | Level 3 | Equity Funds One | Weighted Average | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.2500
Equity/Other | Level 3 | Equity Funds One | Weighted Average | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]		5.44
Equity/Other | Level 3 | Equity Funds Two | Minimum | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]		0.1400
Equity/Other | Level 3 | Equity Funds Two | Minimum | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	4.00
Equity/Other | Level 3 | Equity Funds Two | Maximum | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]		0.3250
Equity/Other | Level 3 | Equity Funds Two | Maximum | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	5.00
Equity/Other | Level 3 | Equity Funds Two | Weighted Average | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]		0.2554
Equity/Other | Level 3 | Equity Funds Two | Weighted Average | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	4.50
Equity/Other | Level 3 | Equity Funds Three | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value	[1]	$ 11,044	$ 5,238
Equity/Other | Level 3 | Equity Funds Three | Minimum | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.12	0.13
Equity/Other | Level 3 | Equity Funds Three | Maximum | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	8.50	7.25
Equity/Other | Level 3 | Equity Funds Three | Weighted Average | Market Approach | Earnings Multiple
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	4.07	2.01
Equity/Other | Level 3 | Equity Funds Four | Income Approach
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value	[1]		$ 12,579
Equity/Other | Level 3 | Equity Funds Four | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value	[1]	$ 4,982
Equity/Other | Level 3 | Equity Funds Four | Minimum | Income Approach
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]		0.1151
Equity/Other | Level 3 | Equity Funds Four | Minimum | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.1907
Equity/Other | Level 3 | Equity Funds Four | Maximum | Income Approach
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]		0.1339
Equity/Other | Level 3 | Equity Funds Four | Maximum | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.1907
Equity/Other | Level 3 | Equity Funds Four | Weighted Average | Income Approach
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]		0.1160
Equity/Other | Level 3 | Equity Funds Four | Weighted Average | Income Approach | Discount Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.1907
Equity/Other | Level 3 | Equity Funds Five | Asset Recovery Liquidation Valuation Technique
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value	[1],[2]	$ 5	$ 221
Equity/Other | Level 3 | Equity Funds Six | Recent Transaction
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value	[1]	$ 4,375
Equity/Other | Level 3 | Equity Funds Seven | Options Pricing Model | Volatility
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.2000
Equity/Other | Level 3 | Equity Funds Seven | Options Pricing Model | Risk Free Rate
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Range (Weighted Average)	[1],[3]	0.0449

[1] The fair value of any one instrument may be determined using multiple valuation techniques or unobservable inputs.

[2] Investments valued using the asset recovery or liquidation technique include investments for which valuation is based on current financial data without a discount rate applied.

[3] Weighted average for an asset category consisting of multiple investments is calculated by weighting the significant unobservable input by the relative fair value of the investment. The range and weighted average for an asset category consisting of a single investment represents the significant unobservable input used in the fair value of the investment.