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Portfolio Company Investments - Additional Information (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
Investment
Dec. 31, 2022
USD ($)
Investment
Dec. 31, 2021
USD ($)
Summary of Investment Holdings [Line Items]      
Number of investment portfolio companies | Investment 81 76  
Number of residual investment porfolio companies | Investment 1 2  
Aggregate fair value of total portfolio $ 957,906,000 $ 860,329,000  
Weighted average effective yield investment percentage 14.20% 13.80%  
Average fully diluted equity ownership percentage 3.00% 4.00%  
Percentage of equity investments held in portfolio companies 79.30% 74.40%  
Purchases of debt and equity investments $ 336,741,000 $ 333,846,000 $ 346,737,000
Proceeds from sales and repayments $ 258,875,000 $ 193,980,000 $ 472,782,000
Number of investments represented more than ten percentage of aggregate investment portfolio | Investment 0 0  
Investments at Fair Value $ 957,906,000 [1],[2],[3],[4] $ 860,329,000 [5],[6],[7],[8]  
Pfanstiehl, Inc      
Summary of Investment Holdings [Line Items]      
Investment $ 0 $ 51,992,000  
Investments as percentage of total assets 5.00% 5.60%  
Maximum      
Summary of Investment Holdings [Line Items]      
Investment maturity period 7 years    
Minimum      
Summary of Investment Holdings [Line Items]      
Investment maturity period 5 years    
[1]

(a) See Note 3 to the consolidated financial statements for portfolio composition by geographic location.
[2]

(b) Equity ownership may be held in shares or units of companies related to the portfolio companies.
[3]

(c) All debt investments are income producing, unless otherwise indicated. Equity investments are non-income producing unless otherwise noted.
[4]

(g) Except as otherwise noted, the Company’s investment portfolio is comprised of debt and equity securities of privately held companies for which quoted prices falling within the categories of Level 1 and Level 2 inputs are not available. Therefore, the Company values all of its portfolio investments at fair value, as determined in good faith by the board of directors, using significant unobservable Level 3 inputs.
[5]

(a) See Note 3 to the consolidated financial statements for portfolio composition by geographic location.
[6]

(b) Equity ownership may be held in shares or units of companies related to the portfolio companies.
[7]

(c) All debt investments are income producing, unless otherwise indicated.

Equity investments are non-income producing unless otherwise noted.
[8]

(g) Except as otherwise noted, the Company’s investment portfolio is comprised of debt and equity securities of privately held companies for which quoted prices falling within the categories of Level 1 and Level 2 inputs are not available. Therefore, the Company values all of its portfolio investments at fair value, as determined in good faith by the board of directors, using significant unobservable Level 3 inputs.