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Portfolio Company Investments - Schedule of Investments Type With Corresponding Percentage of Total Portfolio 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%
First Lien Debt    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 481,547 $ 456,105
Percentage of Fair Value 53.60% 53.00%
Investments at cost $ 478,893 $ 453,585
Percentage of Cost 55.40% 54.70%
Second Lien Debt    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 188,931 $ 182,948
Percentage of Fair Value 21.10% 21.30%
Investments at cost $ 218,939 $ 213,654
Percentage of Cost 25.30% 25.80%
Subordinated Debt    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 102,386 $ 101,456
Percentage of Fair Value 11.40% 11.80%
Investments at cost $ 103,130 $ 100,634
Percentage of Cost 11.90% 12.10%
Equity    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 122,103 $ 117,741
Percentage of Fair Value 13.60% 13.70%
Investments at cost $ 61,066 $ 57,868
Percentage of Cost 7.10% 7.00%
Warrants    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 2,357 $ 2,079
Percentage of Fair Value 0.30% 0.20%
Investments at cost $ 2,952 $ 2,952
Percentage of Cost 0.30% 0.40%
[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.