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Income Taxes - Schedule of Tax Basis of Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]      
Gross unrealized appreciation $ 86,757 $ 88,353 $ 132,173
Gross unrealized depreciation (146,095) (129,296) (22,232)
Net change in unrealized appreciation (depreciation) (59,338) (40,943) 109,941
Tax cost of investments $ 9,927,777 $ 9,658,192 $ 9,855,692