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Significant Accounting Policies - Additional Information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
DebtInvestment
InvesteeCompany
Dec. 31, 2023
USD ($)
InvesteeCompany
DebtInvestment
Dec. 31, 2022
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Purchase of investments $ 78,421 $ 48,188 $ 222,202
Repayments and sales of investments 125,695 146,945 $ 160,964
Net repayment and sales amount of investment $ 47,300 $ 98,800  
Number of investee companies where loans held | InvesteeCompany 71 80  
Aggregate principal amount of loans held $ 366,100 $ 420,900  
Percentage of investment portfolio valuation 100.00%    
Number of debt investments on non-accrual status | DebtInvestment 6 7  
Aggregate amortized cost of debt investments on non-accrual status $ 16,300 $ 17,300  
Aggregate fair value of debt investments on non-accrual status $ 6,900 $ 6,100  
Percentage of investments in non-accrual status at amortized cost 3.40% 3.20%  
Percentage of investments in non-accrual status at fair value 1.70% 1.30%