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Investments - By Composition and Domicile (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 432,863 | [1] | $ 474,880 | [2]
Percentage of Total, Amortized Cost | 100.00% |  | 100.00% |
Percentage of Total, Net Assets | 253.60% |  | 263.20% |
Fair Value | $ 457,247 | [1],[3] | $ 500,576 | [2],[4]
Percentage of Total, Fair Value | 100.00% |  | 100.00% |
Percentage of Total, Net Assets | 267.90% | [1] | 277.40% | [2]
United States |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 327,538 |  | $ 367,723 |
Fair Value | 371,481 |  | 407,851 |
Canada |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | 4,660 |  | 4,680 |
Fair Value | 2,477 |  | 4,207 |
Cayman Islands |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | 93,017 |  | 102,477 |
Fair Value | 75,641 |  | 88,518 |
Jersey |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | 7,648 |  | 0 |
Fair Value | 7,648 |  | 0 |
Total Debt and Equity Investments - Non-control/Non-affiliate Investments |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 332,198 |  | $ 372,403 |
Percentage of Total, Amortized Cost | 76.70% |  | 78.40% |
Percentage of Total, Net Assets | 194.60% |  | 206.40% |
Fair Value | $ 373,958 |  | $ 412,058 |
Percentage of Total, Fair Value | 81.80% |  | 82.30% |
Percentage of Total, Net Assets | 219.10% |  | 228.30% |
Senior Secured Debt Investments |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 304,865 |  | $ 335,558 |
Percentage of Total, Amortized Cost | 70.30% |  | 70.70% |
Percentage of Total, Net Assets | 178.60% |  | 186.00% |
Fair Value | $ 279,144 |  | $ 311,636 |
Percentage of Total, Fair Value | 61.10% |  | 62.30% |
Percentage of Total, Net Assets | 163.50% |  | 172.70% |
Subordinated debt investments |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 4,680 |  | $ 13,890 |
Percentage of Total, Amortized Cost | 1.10% |  | 2.90% |
Percentage of Total, Net Assets | 2.70% |  | 7.70% |
Fair Value | $ 100 |  | $ 1,226 |
Percentage of Total, Fair Value | 0.00% |  | 0.20% |
Percentage of Total, Net Assets | 0.10% |  | 0.70% |
Preferred equity |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 11,116 |  | $ 9,966 |
Percentage of Total, Amortized Cost | 2.60% |  | 2.10% |
Percentage of Total, Net Assets | 6.50% |  | 5.50% |
Fair Value | $ 11,806 |  | $ 8,196 |
Percentage of Total, Fair Value | 2.60% |  | 1.60% |
Percentage of Total, Net Assets | 6.90% |  | 4.50% |
Common equity, warrants and other |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 11,537 |  | $ 12,989 |
Percentage of Total, Amortized Cost | 2.70% |  | 2.70% |
Percentage of Total, Net Assets | 6.80% |  | 7.20% |
Fair Value | $ 82,908 |  | $ 91,000 |
Percentage of Total, Fair Value | 18.10% |  | 18.20% |
Percentage of Total, Net Assets | 48.60% |  | 50.40% |
Structured Finance Securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 100,665 |  | $ 102,477 | [5]
Percentage of Total, Amortized Cost | 23.30% |  | 21.60% |
Percentage of Total, Net Assets | 59.00% |  | 56.80% |
Fair Value | $ 83,289 |  | $ 88,518 | [4],[5]
Percentage of Total, Fair Value | 18.20% |  | 17.70% |
Percentage of Total, Net Assets | 48.80% |  | 49.10% | [5]
[1] | Equity ownership may be held in shares or units of companies affiliated with the portfolio company. The Company’s investments are generally classified as “restricted securities” as such term is defined under Regulation S-X Rule 6-03(f) or Securities Act Rule 144.
[2] | Equity ownership may be held in shares or units of companies affiliated with the portfolio company. The Company’s investments are generally classified as “restricted securities” as such term is defined under Regulation S-X Rule 6-03(f) or Securities Act Rule 144.
[3] | Unless otherwise noted in footnote 14, fair value was determined using significant unobservable inputs for all of the Company’s investments and are considered Level 3 under GAAP. See Note 5 for further details.
[4] | Unless otherwise noted with footnote 14, fair value was determined using significant unobservable inputs for all of the Company’s investments and are considered Level 3 under GAAP. See Note 5 for further details.
[5] | Non-qualifying assets under Section 55(a) of the 1940 Act. Qualifying assets as defined in Section 55 of the 1940 Act must represent at least 70% of the Company's assets immediately following the acquisition of any additional non-qualifying assets. As of December 31, 2022, approximately 80% of the Company's assets were qualifying assets.

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