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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
9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 926,859 [1],[2],[3],[4] $ 860,329 [5],[6],[7],[8]
Percentage of Fair Value 100.00% 100.00%
Investments at cost $ 895,362 [1],[2],[3] $ 828,693 [5],[6],[7]
Percentage of Cost 100.00% 100.00%
United States Midwest    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 147,123 $ 180,556
Percentage of Fair Value 15.90% 21.00%
Investments at cost $ 107,068 $ 132,177
Percentage of Cost 12.00% 16.00%
United States Southeast    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 294,840 $ 265,902
Percentage of Fair Value 31.90% 31.00%
Investments at cost $ 281,638 $ 258,373
Percentage of Cost 31.40% 31.10%
United States Northeast    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 152,938 $ 127,427
Percentage of Fair Value 16.50% 14.80%
Investments at cost $ 149,427 $ 134,897
Percentage of Cost 16.70% 16.30%
United States West    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 167,020 $ 151,487
Percentage of Fair Value 18.00% 17.60%
Investments at cost $ 184,836 $ 161,935
Percentage of Cost 20.60% 19.50%
United States Southwest    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 152,438 $ 122,519
Percentage of Fair Value 16.40% 14.20%
Investments at cost $ 159,936 $ 128,873
Percentage of Cost 17.90% 15.60%
Canada    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 12,500 $ 12,438
Percentage of Fair Value 1.30% 1.40%
Investments at cost $ 12,457 $ 12,438
Percentage of Cost 1.40% 1.50%
[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.