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Income Taxes - Cost and unrealized gain (loss) calculated on a tax basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Taxes      
Gross unrealized appreciation $ 6,529 $ 18,635 $ 5,121
Gross unrealized depreciation (72,587) (4,696) (577)
Net unrealized appreciation (depreciation) (66,058) 13,939 4,544
Tax cost of investments at year end $ 2,939,635 $ 2,373,435 $ 632,437