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Consolidated Schedule of Investments (Parenthetical) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Schedule of Investments [Line Items] |  |  |
Percentage of debt securities contains floor rates |  | 77.50% | 78.80%
Aggregate cost of investments |  | $ 584,586 | $ 652,217
Aggregate gross unrealized appreciation |  | 38,800 | 34,800
Aggregate gross unrealized depreciation |  | 38,400 | 38,300
Net unrealized depreciation |  | $ 400 | $ 3,400
Percentage of qualifying assets to total assets |  | 84.50% | 82.40%
Maximum |  |  |
Schedule of Investments [Line Items] |  |  |
Floor rate |  | 2.50% | 2.00%
Minimum |  |  |
Schedule of Investments [Line Items] |  |  |
Floor rate |  | 0.50% | 0.50%
Investments |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of net asset value at fair value |  | 233.00% | 247.00%
Garrison Capital Equity Holdings II LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Non controlling member interest rate |  | 17.50% | 17.50%
ATP Oil & Gas Corporation |  |  |
Schedule of Investments [Line Items] |  |  |
Royalty interest |  | 5.00% | 5.00%
Junior Secured Loan |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of net asset value at fair value |  | 22.00% | 24.00%
Aggregate cost of investments |  | $ 61,016 | $ 65,776
Senior Unsecured Bond |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of net asset value at fair value |  | 0.00% | 0.00%
Aggregate cost of investments |  | $ 416 | $ 416
Senior Unsecured Bond | Tank Partners Equipment Holdings, LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of net asset value at fair value |  | 10.00% | 10.00%
Equity Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of net asset value at fair value |  | 9.00% | 9.00%
Aggregate cost of investments |  | $ 29,667 | $ 28,848
CLO Subordinated Investments |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of net asset value at fair value |  | 5.00% | 9.00%
Asset Manager Affiliates |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of net asset value at fair value |  | 0.00% | 0.00%
Aggregate cost of investments | [1] | $ 17,791 | $ 17,791
Joint Ventures |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of net asset value at fair value |  | 29.00% | 25.00%
Aggregate cost of investments |  | $ 75,513 | $ 68,850
Derivatives |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of net asset value at fair value |  | 0.00% | 0.00%
Aggregate cost of investments |  | $ 31 |
Senior Secured Loan |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of net asset value at fair value |  | 168.00% | 180.00%
Aggregate cost of investments |  | $ 378,284 | $ 435,856
Investments For Federal Income Tax Purpose |  |  |
Schedule of Investments [Line Items] |  |  |
Aggregate cost of investments |  | $ 595,500 | $ 656,000
Controlled Affiliated Investments | Minimum |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of outstanding voting securities owned |  | 25.00% | 25.00%
Non-controlled Affiliated Investments | Minimum |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of outstanding voting securities owned |  | 5.00% | 5.00%
[1] | Represents the equity investment in the Asset Manager Affiliates.

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