Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2023		Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value	$ 1,742,661	[1],[2],[3]	$ 2,047,115	[4],[5]
Level 1—Price quotations in active markets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value	5,011		2,465
Level 2—Significant other observable inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value	229,247		450,445
Level 3—Significant unobservable inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value	$ 1,508,403		$ 1,594,205

[1] Security may be an obligation of one or more entities affiliated with the named company.

[2] Security or portion thereof is pledged as collateral supporting the amounts outstanding under the Senior Secured Notes with JPMorgan Chase Bank, N.A. (see Note 9).

[3] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

[4] Security may be an obligation of one or more entities affiliated with the named company.

[5] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.