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Fair Value of Financial Instruments - Schedule of Portfolio Investments by Level in the Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Mar. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	$ 1,697,588		$ 1,729,264
Investments, at fair value:	1,723,352	[1]	1,760,030
Controlled investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, at fair value:	80,591		91,114	$ 91,425
Controlled investments | CION/EagleTree Partners, LLC
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, at fair value:	25,764		30,766
Senior secured first lien debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	1,472,453		1,579,512
Senior secured second lien debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	38,997		38,769
Collateralized securities and structured products - equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	1,133		1,179
Unsecured debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	15,517		22,643
Equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	103,162		76,292
Short term investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	66,326		10,869
Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	68,530		13,210
Level 1 | Senior secured first lien debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	0		0
Level 1 | Senior secured second lien debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	0		0
Level 1 | Collateralized securities and structured products - equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	0		0
Level 1 | Unsecured debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	0		0
Level 1 | Equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	2,204		2,341
Level 1 | Short term investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	66,326		10,869
Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	0		0
Level 2 | Senior secured first lien debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	0		0
Level 2 | Senior secured second lien debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	0		0
Level 2 | Collateralized securities and structured products - equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	0		0
Level 2 | Unsecured debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	0		0
Level 2 | Equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	0		0
Level 2 | Short term investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	0		0
Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	1,629,058		1,716,054
Investments, at fair value:	1,629,058		1,716,054
Level 3 | Senior secured first lien debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	1,472,453		1,579,512
Level 3 | Senior secured second lien debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	38,997		38,769
Level 3 | Collateralized securities and structured products - equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	1,133		1,179
Level 3 | Unsecured debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	15,517		22,643
Level 3 | Equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	100,958		73,951
Level 3 | Short term investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments, fair value disclosure	$ 0		$ 0
[1] Fair value determined in good faith by the Company’s board of directors (see Note 9), including via delegation to CIM as the Company’s valuation designee (see Note 2), using significant unobservable inputs unless otherwise noted.

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Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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