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Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Tax Credit Carryforward [Line Items]      
Income taxes, including excise tax expense $ 2,007 $ 611 $ 7
Accumulated capital losses 666,300 582,153 $ 304,240
Cost of investments, income tax purposes 2,534,400 2,565,900  
Unrealized appreciation (depreciation) (38,500) (105,800)  
Unrealized gross appreciation 124,800 112,400  
Unrealized gross depreciation 163,300 218,300  
Deferred tax assets, investments 9,900 9,500  
Deferred tax assets, valuation allowance 7,900 8,300  
Short-Term Capital Loss Carryforward      
Tax Credit Carryforward [Line Items]      
Accumulated capital losses 37,000 27,100  
Long-Term Capital Loss Carryforward      
Tax Credit Carryforward [Line Items]      
Accumulated capital losses $ 629,300 $ 555,100