Income Taxes - Schedule of Aggregate Investment Unrealized Appreciation and Depreciation for Federal Income Tax Purposes (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Cost of investments for federal income tax purposes	$ 1,012,574	$ 1,051,514
Unrealized appreciation	66,810	57,357
Unrealized depreciation	(109,250)	(88,118)
Net unrealized depreciation on investments	$ (42,440)	$ (30,761)