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Portfolio Company Investments - Additional Information (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
Investment
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Investment
Schedule of Investments [Line Items]      
Number of investment portfolio companies | Investment 86   81
Number of residual investment porfolio companies | Investment 5   1
Aggregate fair value of total portfolio $ 1,078,424,000   $ 957,906,000
Weighted average yield investment percentage 14.00%   14.20%
Average fully diluted equity ownership percentage 3.60%   3.00%
Percentage of equity investments held in portfolio companies 81.30%   79.30%
Purchases of debt and equity investments $ 208,306,000 $ 147,348,000  
Proceeds from sales and repayments $ 103,343,000 $ 76,503,000  
Number of investments represented more than ten percentage of aggregate investment portfolio | Investment 0   0
Investment $ 0   $ 0
Investments as percentage of total assets 5.00%   5.00%
Investment, Type [Extensible Enumeration] Pfanstiehl Inc [Member]   Pfanstiehl Inc [Member]
Maximum      
Schedule of Investments [Line Items]      
Investment maturity period 7 years    
Minimum      
Schedule of Investments [Line Items]      
Investment maturity period 5 years