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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.