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Portfolio Company Investments - Schedule of Portfolio Composition by Geographic Region at Fair Value and Cost and as Percentage of Total Investments (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 1,432,911 [1],[2],[3],[4] $ 1,324,753 [5],[6],[7],[8]
Percentage of Fair Value 100.00% 100.00%
Investments at cost $ 1,404,431 [1],[2],[3] $ 1,299,294 [5],[6],[8]
Percentage of Cost 100.00% 100.00%
United States Midwest    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 161,809 $ 162,362
Percentage of Fair Value 11.30% 12.30%
Investments at cost $ 114,163 $ 114,396
Percentage of Cost 8.10% 8.80%
United States Southeast    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 437,946 $ 387,245
Percentage of Fair Value 30.60% 29.10%
Investments at cost $ 429,895 $ 379,889
Percentage of Cost 30.70% 29.30%
United States Northeast    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 296,270 $ 263,070
Percentage of Fair Value 20.70% 19.90%
Investments at cost $ 296,557 $ 262,718
Percentage of Cost 21.10% 20.20%
United States West    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 218,767 $ 213,090
Percentage of Fair Value 15.30% 16.10%
Investments at cost $ 230,438 $ 232,829
Percentage of Cost 16.40% 17.90%
United States Southwest    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 302,005 $ 282,971
Percentage of Fair Value 21.00% 21.40%
Investments at cost $ 317,398 $ 293,590
Percentage of Cost 22.60% 22.60%
Canada    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 16,114 $ 16,015
Percentage of Fair Value 1.10% 1.20%
Investments at cost $ 15,980 $ 15,872
Percentage of Cost 1.10% 1.20%
[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. The Company’s investments are generally classified as “restricted securities”, unless otherwise noted, as such term is defined under Regulation S-X Rule 6-03(f) or Securities Act Rule 144. As of June 30, 2026, the Company held restricted securities with an aggregate fair value of $1,432,911, or 194% of the Company's net assets.

[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] All debt investments are income producing, unless otherwise indicated. Equity investments are non-income producing unless otherwise noted.
[6] Equity ownership may be held in shares or units of companies related to the portfolio companies. The Company’s investments are generally classified as “restricted securities”, unless otherwise noted, as such term is defined under Regulation S-X Rule 6-03(f) or Securities Act Rule 144. As of December 31, 2025, the Company held restricted securities with an aggregate fair value of $1,324,753, or 179% of the Company's net assets.
[7] 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.
[8] See Note 3 to the consolidated financial statements for portfolio composition by geographic location.