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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
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 897,324 [1],[2],[3] $ 860,329 [4],[5],[6],[7]
Percentage of Fair Value 100.00% 100.00%
Investments at cost $ 864,980 [1],[2],[3] $ 828,693 [4],[5],[6]
Percentage of Cost 100.00% 100.00%
United States Midwest    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 173,676 $ 180,556
Percentage of Fair Value 19.40% 21.00%
Investments at cost $ 125,969 $ 132,177
Percentage of Cost 14.60% 16.00%
United States Southeast    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 279,940 $ 265,902
Percentage of Fair Value 31.10% 31.00%
Investments at cost $ 271,839 $ 258,373
Percentage of Cost 31.50% 31.10%
United States Northeast    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 155,837 $ 127,427
Percentage of Fair Value 17.40% 14.80%
Investments at cost $ 163,512 $ 134,897
Percentage of Cost 18.90% 16.30%
United States West    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 150,203 $ 151,487
Percentage of Fair Value 16.70% 17.60%
Investments at cost $ 162,072 $ 161,935
Percentage of Cost 18.70% 19.50%
United States Southwest    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 125,223 $ 122,519
Percentage of Fair Value 14.00% 14.20%
Investments at cost $ 129,143 $ 128,873
Percentage of Cost 14.90% 15.60%
Canada    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 12,445 $ 12,438
Percentage of Fair Value 1.40% 1.40%
Investments at cost $ 12,445 $ 12,438
Percentage of Cost 1.40% 1.50%
[1] All debt investments are income producing, unless otherwise indicated. Equity investments are non-income producing unless otherwise noted.
[2] Equity ownership may be held in shares or units of companies related to the portfolio companies.
[3] See Note 3 to the consolidated financial statements for portfolio composition by geographic location.
[4]

(a) See Note 3 to the consolidated financial statements for portfolio composition by geographic location.
[5]

(b) Equity ownership may be held in shares or units of companies related to the portfolio companies.
[6]

(c) All debt investments are income producing, unless otherwise indicated. Equity investments are non-income producing unless otherwise noted.
[7]

(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.