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INVESTMENTS - Narrative (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
investment
loan
Mar. 31, 2023
USD ($)
investment
Jun. 30, 2023
Dec. 31, 2023
USD ($)
investment
loan
Feb. 01, 2023
USD ($)
Dec. 31, 2022
USD ($)
Aug. 12, 2022
USD ($)
Jul. 08, 2021
USD ($)
May 31, 2021
USD ($)
Apr. 28, 2020
USD ($)
Schedule of Equity Method Investments [Line Items]                    
Purchases of portfolio investments $ 51,561,000 $ 118,902,000                
Cost 1,359,869,000     $ 1,352,116,000            
Total investments at fair value 1,363,048,000     1,349,121,000            
Borrowings under credit facility 642,422,000     644,463,000            
Dividend income, operating 3,950,000 $ 3,479,000                
Total unused commitments to extend financing $ 103,209,000     $ 114,328,000            
Number of investment on Non Accrual | investment       1            
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net unrealized appreciation (depreciation) on investments Net unrealized appreciation (depreciation) on investments                
Number of securities on nonaccrual basis | investment 3     1            
Level 3                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value $ 1,261,653,000     $ 1,254,451,000            
Pre-tax unrealized appreciation (600,000) $ 9,500,000                
Waccamaw River, LLC                    
Schedule of Equity Method Investments [Line Items]                    
Cost 25,036,000     25,036,000            
Total investments at fair value 15,655,000     15,470,000            
Eclipse Business Capital Holdings LLC                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value               $ 2,200,000    
Banff Partners LP                    
Schedule of Equity Method Investments [Line Items]                    
Proceeds from disposition of investment, operating activity, cumulative 187,900,000     187,900,000            
Thompson Rivers LLC                    
Schedule of Equity Method Investments [Line Items]                    
Total contributed capital 450,000,000                  
Dividends 15,000,000 57,000,000                
All Member Of Waccamaw River LLC                    
Schedule of Equity Method Investments [Line Items]                    
Total contributed capital 125,000,000                  
All Member Of Waccamaw River LLC | Waccamaw River, LLC                    
Schedule of Equity Method Investments [Line Items]                    
Total return of capital (recallable) 14,000,000                  
Waccamaw River, LLC                    
Schedule of Equity Method Investments [Line Items]                    
Dividends 0 3,600,000                
Line of Credit                    
Schedule of Equity Method Investments [Line Items]                    
Long-term debt, gross 642,422,000     644,463,000            
JPMorgan Chase Bank N.A. Non-Recourse Loan | Secured Debt | Waccamaw River, LLC                    
Schedule of Equity Method Investments [Line Items]                    
Long-term debt, gross 55,900,000     71,000,000            
Bank of America N.A., | Secured Debt | Waccamaw River, LLC                    
Schedule of Equity Method Investments [Line Items]                    
Long-term debt, gross 38,000,000     51,300,000            
Subscription Facility | Bank Of America Subscription Facility | Line of Credit | Banff Partners LP                    
Schedule of Equity Method Investments [Line Items]                    
Borrowings under credit facility 0     19,200,000            
Banff Partners LP                    
Schedule of Equity Method Investments [Line Items]                    
Cost 150,821,000     151,907,000            
Total investments at fair value $ 143,697,000     $ 146,477,000            
Investment owned, weighted average yield 10.50%     10.60%            
Thompson Rivers LLC                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 328,095,000     $ 386,657,000            
Total investments at fair value 307,685,000     $ 366,731,000            
Dividend income, operating 0 0                
Distribution of realized gains $ 1,000,000 3,800,000                
Investment owned, outstanding loans | loan 1,974     2,305            
Investment owned, average unpaid balance $ 200,000     $ 200,000            
Investment owned, weighted average coupon rate 4.00%     4.00%            
Thompson Rivers LLC | JPMorgan Chase Bank                    
Schedule of Equity Method Investments [Line Items]                    
Repurchase agreement counterparty, amount at risk $ 70,200,000     $ 83,500,000            
Thompson Rivers LLC | Bank of America N.A.,                    
Schedule of Equity Method Investments [Line Items]                    
Repurchase agreement counterparty, amount at risk 144,100,000     170,800,000            
Thompson Rivers LLC | Barclays Bank                    
Schedule of Equity Method Investments [Line Items]                    
Repurchase agreement counterparty, amount at risk 45,100,000     $ 50,000,000            
Waccamaw River, LLC                    
Schedule of Equity Method Investments [Line Items]                    
Dividend income, operating $ 0 $ 700,000                
Investment owned, outstanding loans | loan 19,291     21,435            
Average loan amount $ 9,764     $ 10,338            
Investment company, weighted average interest rate 12.80%     12.70%            
Remaining average life to maturity 38 years 2 months 12 days   40 months              
Waccamaw River, LLC | All Member Of Waccamaw River LLC                    
Schedule of Equity Method Investments [Line Items]                    
Total contributed capital $ 139,020,000     $ 139,020,000            
Total unused commitments to extend financing 0     0            
Rocade Holdings LLC                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value 50,500,000                  
Payments to Acquire Investments       5,500,000            
Investment, Identifier [Axis]: Riedel Beheer B.V., Food & Beverage, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,258,000 [1],[2],[3],[4]     2,256,000 [5],[6],[7],[8]            
Total investments at fair value 2,025,000 [1],[2],[3],[4]     2,078,000 [5],[6],[7],[8]            
Investment, Identifier [Axis]: A.T. Holdings II LTD, Other Financial, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,500,000 [2],[3]     7,500,000 [5],[6]            
Total investments at fair value 6,690,000 [2],[3]     7,013,000 [5],[6]            
Investment, Identifier [Axis]: AD Bidco, Inc., Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,174,000     0            
Investment, Identifier [Axis]: AD Bidco, Inc., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 434,000     0            
Investment, Identifier [Axis]: AD Bidco, Inc., Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[9],[10] 3,278,000                  
Total investments at fair value [1],[3],[9],[10] 3,278,000                  
Investment, Identifier [Axis]: AD Bidco, Inc., Technology, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[9],[10] (11,000)                  
Total investments at fair value [1],[3],[9],[10] (11,000)                  
Investment, Identifier [Axis]: ADB Safegate, Aerospace & Defense, Second Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 6,390,000 [1],[2],[3],[10]     6,129,000 [5],[6],[8],[11]            
Total investments at fair value 5,821,000 [1],[2],[3],[10]     5,392,000 [5],[6],[8],[11]            
Investment, Identifier [Axis]: AIT Worldwide Logistics Holdings, Inc., Transportation Services, Partnership Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 162,000 [3],[12]     162,000 [6],[13]            
Total investments at fair value 249,000 [3],[12]     249,000 [6],[13]            
Investment, Identifier [Axis]: AIT Worldwide Logistics Holdings, Inc., Transportation Services, Second Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,773,000 [1],[3],[14]     4,770,000 [6],[8],[15]            
Total investments at fair value 4,821,000 [1],[3],[14]     4,805,000 [6],[8],[15]            
Investment, Identifier [Axis]: APC1 Holding, Diversified Manufacturing, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,316,000 [1],[2],[3],[4]     2,314,000 [5],[6],[7],[8]            
Total investments at fair value 2,454,000 [1],[2],[3],[4]     2,505,000 [5],[6],[7],[8]            
Investment, Identifier [Axis]: APOG Bidco Pty Ltd, Healthcare, Second Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,025,000 [1],[2],[3],[16]     1,024,000 [5],[6],[8],[17]            
Total investments at fair value 901,000 [1],[2],[3],[16]     935,000 [5],[6],[8],[17]            
Investment, Identifier [Axis]: AQA Acquisition Holding, Inc., High Tech Industries, Second Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 20,630,000 [1],[3],[10]     20,615,000 [6],[8],[11]            
Total investments at fair value 21,000,000 [1],[3],[10]     20,935,000 [6],[8],[11]            
Investment, Identifier [Axis]: ASC Communications, LLC, Media & Entertainment, Class A Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 326,000 [3]     326,000 [6]            
Total investments at fair value 455,000 [3]     425,000 [6]            
Investment, Identifier [Axis]: ASC Communications, LLC, Media & Entertainment, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 10,564,000 [1],[3],[14]     11,006,000 [6],[8],[15]            
Total investments at fair value 10,686,000 [1],[3],[14]     11,048,000 [6],[8],[15]            
Investment, Identifier [Axis]: ASC Communications, LLC, Media & Entertainment, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (7,000) [1],[3],[9],[14]     (8,000) [6],[8],[15],[18]            
Total investments at fair value 0 [1],[3],[9],[14]     (5,000) [6],[8],[15],[18]            
Investment, Identifier [Axis]: ASC Communications, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 658,000     659,000            
Investment, Identifier [Axis]: ATL II MRO Holdings Inc, Transportation, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 6,042,000 [1],[3],[10]     6,054,000 [6],[8],[11]            
Total investments at fair value 6,018,000 [1],[3],[10]     6,188,000 [6],[8],[11]            
Investment, Identifier [Axis]: ATL II MRO Holdings Inc, Transportation, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (25,000) [1],[3],[9],[10]     (26,000) [6],[8],[11],[18]            
Total investments at fair value (31,000) [1],[3],[9],[10]     0 [6],[8],[11],[18]            
Investment, Identifier [Axis]: ATL II MRO Holdings Inc., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,250,000     1,250,000            
Investment, Identifier [Axis]: AVSC Holding Corp., Advertising, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,468,000     4,245,000            
Total investments at fair value $ 4,699,000     $ 4,354,000            
Investment, interest rate, paid in kind 10.00%     10.00%            
Investment, Identifier [Axis]: Accelerant Holdings, Banking, Finance, Insurance & Real Estate, Class A Convertible Preferred Equity                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 2,500,000 [3],[12]     $ 2,500,000 [6],[13]            
Total investments at fair value 2,990,000 [3],[12]     2,929,000 [6],[13]            
Investment, Identifier [Axis]: Accelerant Holdings, Banking, Finance, Insurance & Real Estate, Class B Convertible Preferred Equity                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,666,000 [3],[12]     1,666,000 [6],[13]            
Total investments at fair value 2,030,000 [3],[12]     1,949,000 [6],[13]            
Investment, Identifier [Axis]: Acclime Holdings HK Limited, Business services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,909,000 [1],[2],[3],[19]     1,907,000 [5],[6],[8],[20]            
Total investments at fair value 1,925,000 [1],[2],[3],[19]     1,910,000 [5],[6],[8],[20]            
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Aerospace & Defense, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 175,000 [3],[12]     175,000 [6],[13]            
Total investments at fair value 172,000 [3],[12]     205,000 [6],[13]            
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Aerospace & Defense, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 8,697,000 [1],[3],[10]     8,693,000 [6],[8],[11]            
Total investments at fair value 8,564,000 [1],[3],[10]     8,529,000 [6],[8],[11]            
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Aerospace & Defense, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 728,000 [1],[3],[9],[10]     659,000 [6],[8],[11],[18]            
Total investments at fair value 714,000 [1],[3],[9],[10]     641,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 184,000     254,000            
Investment, Identifier [Axis]: Acogroup, Business Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,205,000 [1],[2],[3],[4]     3,193,000 [5],[6],[7],[8]            
Total investments at fair value $ 2,716,000 [1],[2],[3],[4]     $ 2,899,000 [5],[6],[7],[8]            
Investment, interest rate, paid in kind 2.30% [1],[2],[3],[4]     2.30% [5],[6],[7],[8]            
Investment, Identifier [Axis]: Adhefin International, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing $ 410,000     $ 419,000            
Investment, Identifier [Axis]: Adhefin International, Industrial Other, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,771,000 [1],[2],[3],[4],[9]     1,769,000 [5],[6],[7],[8],[18]            
Total investments at fair value 1,755,000 [1],[2],[3],[4],[9]     1,778,000 [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: Adhefin International, Industrial Other, Subordinated Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 298,000 [1],[2],[3],[4]     298,000 [5],[6],[7],[8]            
Total investments at fair value $ 294,000 [1],[2],[3],[4]     $ 300,000 [5],[6],[7],[8]            
Investment, interest rate, paid in kind 14.40% [1],[2],[3],[4]     14.40% [5],[6],[7],[8]            
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class A1 Partnership Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 97,000 [3],[12]     $ 97,000 [6],[13]            
Total investments at fair value 241,000 [3],[12]     241,000 [6],[13]            
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class A2 Partnership Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 25,000 [3],[12]     25,000 [6],[13]            
Total investments at fair value 62,000 [3],[12]     62,000 [6],[13]            
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class B1 Partnership Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,000 [3],[12]     3,000 [6],[13]            
Total investments at fair value 0 [3],[12]     0 [6],[13]            
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class B2 Partnership Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,000 [3],[12]     1,000 [6],[13]            
Total investments at fair value 0 [3],[12]     0 [6],[13]            
Investment, Identifier [Axis]: Air Canada 2020-2 Class B Pass Through Trust, Airlines, Structured Secured Note - Class B                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,170,000     1,170,000            
Total investments at fair value 1,197,000     1,196,000            
Investment, Identifier [Axis]: Air Comm Corporation, LLC, Aerospace & Defense, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 11,453,000 [1],[3],[10]     11,483,000 [6],[8],[11]            
Total investments at fair value 11,541,000 [1],[3],[10]     11,441,000 [6],[8],[11]            
Investment, Identifier [Axis]: Air Comm Corporation, LLC, Aerospace & Defense, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,005,000 [1],[3],[10]     1,008,000 [6],[8],[11]            
Total investments at fair value 1,030,000 [1],[3],[10]     1,035,000 [6],[8],[11]            
Investment, Identifier [Axis]: Air Comm Corporation, LLC, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 236,000     236,000            
Investment, Identifier [Axis]: AirX Climate Solutions, Inc, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 80,000     96,000            
Investment, Identifier [Axis]: AirX Climate Solutions, Inc., Diversified Manufacturing, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 645,000 [1],[3],[9],[10]     646,000 [6],[8],[11],[18]            
Total investments at fair value 647,000 [1],[3],[9],[10]     645,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: AirX Climate Solutions, Inc., Diversified Manufacturing, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 14,000 [1],[3],[9],[10]     (2,000) [6],[8],[11],[18]            
Total investments at fair value 15,000 [1],[3],[9],[10]     (2,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: AlliA Insurance Brokers NV, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,598,000     1,634,000            
Investment, Identifier [Axis]: AlliA Insurance Brokers NV, Insurance, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,324,000 [1],[2],[3],[4],[9]     3,320,000 [5],[6],[7],[8],[18]            
Total investments at fair value 3,469,000 [1],[2],[3],[4],[9]     3,443,000 [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Class B Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,000 [2],[3],[12]     520,000 [5],[6],[13]            
Total investments at fair value 322,000 [2],[3],[12]     594,000 [5],[6],[13]            
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Subordinated Loan Notes                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,451,000 [2],[3]     2,451,000 [5],[6]            
Total investments at fair value $ 2,420,000 [2],[3]     $ 2,412,000 [5],[6]            
Investment, interest rate, paid in kind 9.00% [2],[3]     9.00% [5],[6]            
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Warrant                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 520,000 [2],[3],[12]     $ 2,000 [5],[6],[13]            
Total investments at fair value 588,000 [2],[3],[12]     264,000 [5],[6],[13]            
Investment, Identifier [Axis]: Americo Chemical Products, LLC, Chemicals, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 88,000 [3],[12]     88,000 [6],[13]            
Total investments at fair value 93,000 [3],[12]     89,000 [6],[13]            
Investment, Identifier [Axis]: Americo Chemical Products, LLC, Chemicals, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,887,000 [1],[3],[14]     1,891,000 [6],[8],[15]            
Total investments at fair value 1,930,000 [1],[3],[14]     1,920,000 [6],[8],[15]            
Investment, Identifier [Axis]: Americo Chemical Products, LLC, Chemicals, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (10,000) [1],[3],[9],[14]     (10,000) [6],[8],[15],[18]            
Total investments at fair value 0 [1],[3],[9],[14]     (4,000) [6],[8],[15],[18]            
Investment, Identifier [Axis]: Americo Chemical Products, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 471,000     471,000            
Investment, Identifier [Axis]: Amtech LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 263,000     145,000            
Investment, Identifier [Axis]: Amtech LLC, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [6],[8],[11]       1,765,000            
Total investments at fair value [6],[8],[11]       1,779,000            
Investment, Identifier [Axis]: Amtech LLC, Technology, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] 1,766,000                  
Total investments at fair value [1],[3],[10] 1,753,000                  
Investment, Identifier [Axis]: Amtech LLC, Technology, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] 439,000                  
Total investments at fair value [1],[3],[10] 439,000                  
Investment, Identifier [Axis]: Amtech LLC, Technology, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (3,000) [1],[3],[9],[10]     79,000 [6],[8],[11],[18]            
Total investments at fair value (5,000) [1],[3],[9],[10]     81,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: AnalytiChem Holding Gmbh, Chemicals, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 919,000 [1],[2],[3],[21]     919,000 [5],[6],[8],[22]            
Total investments at fair value 829,000 [1],[2],[3],[21]     865,000 [5],[6],[8],[22]            
Investment, Identifier [Axis]: AnalytiChem Holding Gmbh, Chemicals, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,434,000 [1],[2],[3],[4]     4,431,000 [5],[6],[7],[8]            
Total investments at fair value 4,297,000 [1],[2],[3],[4]     4,386,000 [5],[6],[7],[8]            
Investment, Identifier [Axis]: AnalytiChem Holding Gmbh, Chemicals, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,694,000 [1],[2],[3],[4]     2,692,000 [5],[6],[7],[8]            
Total investments at fair value 2,674,000 [1],[2],[3],[4]     2,730,000 [5],[6],[7],[8]            
Investment, Identifier [Axis]: AnalytiChem Holding Gmbh, Chemicals, First Lien Senior Secured Term Loan 3                    
Schedule of Equity Method Investments [Line Items]                    
Cost 936,000 [1],[2],[3],[4]     935,000 [5],[6],[7],[8]            
Total investments at fair value 973,000 [1],[2],[3],[4]     989,000 [5],[6],[7],[8]            
Investment, Identifier [Axis]: AnalytiChem Holding Gmbh, Chemicals, First Lien Senior Secured Term Loan 4                    
Schedule of Equity Method Investments [Line Items]                    
Cost 476,000 [1],[2],[3],[10]     614,000 [5],[6],[8],[11]            
Total investments at fair value 469,000 [1],[2],[3],[10]     604,000 [5],[6],[8],[11]            
Investment, Identifier [Axis]: AnalytiChem Holding Gmbh, Chemicals, First Lien Senior Secured Term Loan 5                    
Schedule of Equity Method Investments [Line Items]                    
Cost 614,000 [1],[2],[3],[10]     476,000 [5],[6],[8],[11]            
Total investments at fair value 605,000 [1],[2],[3],[10]     468,000 [5],[6],[8],[11]            
Investment, Identifier [Axis]: Aptus 1829. GmbH, Chemicals, Plastics, and Rubber, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 8,000 [2],[3],[12]     8,000 [5],[6],[13]            
Total investments at fair value 0 [2],[3],[12]     0 [5],[6],[13]            
Investment, Identifier [Axis]: Aptus 1829. GmbH, Chemicals, Plastics, and Rubber, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,625,000 [1],[2],[3],[23]     1,624,000 [5],[6],[8],[24]            
Total investments at fair value $ 1,333,000 [1],[2],[3],[23]     $ 1,300,000 [5],[6],[8],[24]            
Investment, interest rate, paid in kind 1.50% [1],[2],[3],[23]     1.50% [5],[6],[8],[24]            
Investment, Identifier [Axis]: Aptus 1829. GmbH, Chemicals, Plastics, and Rubber, Preferred Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 79,000 [2],[3],[12]     $ 79,000 [5],[6],[13]            
Total investments at fair value 3,000 [2],[3],[12]     3,000 [5],[6],[13]            
Investment, Identifier [Axis]: Apus Bidco Limited, Banking, Finance, Insurance & Real Estate, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,790,000 [1],[2],[3],[25]     2,788,000 [5],[6],[8],[26]            
Total investments at fair value 2,584,000 [1],[2],[3],[25]     2,589,000 [5],[6],[8],[26]            
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, Capex / Acquisition Facility                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 659,000     665,000            
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, Transportation Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,946,000 [1],[2],[3],[9],[27]     1,942,000 [5],[6],[8],[18],[28]            
Total investments at fair value 1,749,000 [1],[2],[3],[9],[27]     1,747,000 [5],[6],[8],[18],[28]            
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, Transportation Services, Second Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 559,000 [1],[2],[3],[27]     559,000 [5],[6],[8],[28]            
Total investments at fair value $ 515,000 [1],[2],[3],[27]     $ 510,000 [5],[6],[8],[28]            
Investment, interest rate, paid in kind 15.70% [1],[2],[3],[27]     15.70% [5],[6],[8],[28]            
Investment, Identifier [Axis]: Arc Education, Consumer Cyclical, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 3,475,000 [1],[2],[3],[4],[9]     $ 3,471,000 [5],[6],[7],[8],[18]            
Total investments at fair value 3,717,000 [1],[2],[3],[4],[9]     3,791,000 [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: Arc Education, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,263,000     1,291,000            
Investment, Identifier [Axis]: Archimede, Consumer Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,908,000 [1],[2],[3],[4]     7,902,000 [5],[6],[7],[8]            
Total investments at fair value 7,543,000 [1],[2],[3],[4]     7,693,000 [5],[6],[7],[8]            
Investment, Identifier [Axis]: Argus Bidco Limited, CAF Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 180,000     271,000            
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 0 [2],[3],[12]     0 [5],[6],[13]            
Total investments at fair value 0 [2],[3],[12]     0 [5],[6],[13]            
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Equity Loan Notes                    
Schedule of Equity Method Investments [Line Items]                    
Cost 28,000 [2],[3]     28,000 [5],[6]            
Total investments at fair value $ 23,000 [2],[3]     $ 21,000 [5],[6]            
Investment, interest rate, paid in kind 10.00% [2],[3]     10.00% [5],[6]            
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 5                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ (4,000) [1],[2],[3],[9],[25]     $ (5,000) [5],[6],[26]            
Total investments at fair value (8,000) [1],[2],[3],[9],[25]     (14,000) [5],[6],[26]            
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 147,000 [1],[2],[3],[4]     145,000 [5],[6],[7],[8]            
Total investments at fair value $ 154,000 [1],[2],[3],[4]     $ 153,000 [5],[6],[7],[8]            
Investment, interest rate, paid in kind 3.30% [1],[2],[3],[4]     3.30% [5],[6],[7],[8]            
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 776,000 [1],[2],[3],[4]     $ 687,000 [5],[6],[7],[8],[18]            
Total investments at fair value 778,000 [1],[2],[3],[4]     704,000 [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 3                    
Schedule of Equity Method Investments [Line Items]                    
Cost 65,000 [1],[2],[3],[10]     64,000 [5],[6],[11]            
Total investments at fair value $ 64,000 [1],[2],[3],[10]     $ 62,000 [5],[6],[11]            
Investment, interest rate, paid in kind 3.30% [1],[2],[3],[10]     3.30% [5],[6],[11]            
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 4                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 797,000 [1],[2],[3],[25]     $ 783,000 [5],[6],[26]            
Total investments at fair value $ 828,000 [1],[2],[3],[25]     $ 816,000 [5],[6],[26]            
Investment, interest rate, paid in kind 3.30% [1],[2],[3],[25]     3.30% [5],[6],[26]            
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Preferred Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 28,000 [2],[3]     $ 28,000 [5],[6]            
Total investments at fair value $ 23,000 [2],[3]     $ 21,000 [5],[6]            
Investment, interest rate, paid in kind 10.00% [2],[3]     10.00% [5],[6]            
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Second Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 379,000 [2],[3]     $ 363,000 [5],[6]            
Total investments at fair value $ 379,000 [2],[3]     $ 367,000 [5],[6]            
Investment, interest rate, paid in kind 10.50% [2],[3]     10.50% [5],[6]            
Investment, Identifier [Axis]: Ascensus, Inc, Brokerage, Asset Managers & Exchanges, Second Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [8],[11]       $ 7,458,000            
Total investments at fair value [8],[11]       7,201,000            
Investment, Identifier [Axis]: Astra Bidco Limited, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing $ 402,000     471,000            
Investment, Identifier [Axis]: Astra Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,972,000 [1],[2],[3],[9],[25]     1,903,000 [5],[6],[8],[18],[26]            
Total investments at fair value 1,917,000 [1],[2],[3],[9],[25]     1,863,000 [5],[6],[8],[18],[26]            
Investment, Identifier [Axis]: Avance Clinical Bidco Pty Ltd, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 939,000     982,000            
Investment, Identifier [Axis]: Avance Clinical Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,774,000 [1],[2],[3],[9],[29]     1,832,000 [5],[6],[8],[18],[30]            
Total investments at fair value 1,514,000 [1],[2],[3],[9],[29]     1,648,000 [5],[6],[8],[18],[30]            
Investment, Identifier [Axis]: Azalea Buyer, Inc., Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 429,000     429,000            
Investment, Identifier [Axis]: Azalea Buyer, Inc., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 321,000     321,000            
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 128,000 [3],[12]     128,000 [6],[13]            
Total investments at fair value 200,000 [3],[12]     192,000 [6],[13]            
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,166,000 [1],[3],[9],[10]     3,178,000 [6],[8],[11],[18]            
Total investments at fair value 3,213,000 [1],[3],[9],[10]     3,206,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (4,000) [1],[3],[9],[10]     (4,000) [6],[8],[11],[18]            
Total investments at fair value 0 [1],[3],[9],[10]     (2,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, Subordinated Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,094,000 [3]     1,030,000 [6]            
Total investments at fair value $ 1,085,000 [3]     $ 1,020,000 [6]            
Investment, interest rate, paid in kind 12.00% [3]     12.00% [6]            
Investment, Identifier [Axis]: BNI Global, LLC, Other Industrial, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[31] $ 2,433,000                  
Total investments at fair value [1],[3],[31] 2,427,000                  
Investment, Identifier [Axis]: BPG Holdings IV Corp, Capital Goods, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 8,977,000 [1],[3],[10]     $ 8,983,000 [6],[8],[11]            
Total investments at fair value 8,911,000 [1],[3],[10]     8,934,000 [6],[8],[11]            
Investment, Identifier [Axis]: BVI Medical, Inc., Healthcare, Second Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 5,753,000 [1],[3],[4]     5,739,000 [6],[7],[8]            
Total investments at fair value 5,851,000 [1],[3],[4]     5,767,000 [6],[7],[8]            
Investment, Identifier [Axis]: Banff Partners LP                    
Schedule of Equity Method Investments [Line Items]                    
Cost       14,600,000            
Total investments at fair value       16,200,000            
Investment, Identifier [Axis]: Banff Partners LP, Investment Funds & Vehicles                    
Schedule of Equity Method Investments [Line Items]                    
Cost 14,600,000                  
Total investments at fair value 16,600,000                  
Investment, Identifier [Axis]: Banff Partners LP, Investment Funds & Vehicles, Partnership Interest                    
Schedule of Equity Method Investments [Line Items]                    
Cost 14,646,000 [2],[12]     14,646,000 [5],[13]            
Total investments at fair value 16,566,000 [2],[12]     16,219,000 [5],[13]            
Investment, Identifier [Axis]: Banff Partners LP, Partnership Interest                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value 16,566,000     16,219,000   $ 14,730,000        
Investment, Identifier [Axis]: Bariacum S.A, Consumer Products, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,532,000 [1],[2],[3],[23]     2,529,000 [5],[6],[8],[24]            
Total investments at fair value 2,469,000 [1],[2],[3],[23]     2,541,000 [5],[6],[8],[24]            
Investment, Identifier [Axis]: Beyond Risk Management, Inc., Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 2,007,000     2,007,000            
Investment, Identifier [Axis]: Beyond Risk Management, Inc., Other Financial, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,913,000 [1],[3],[9],[10]     2,923,000 [6],[8],[11],[18]            
Total investments at fair value 2,916,000 [1],[3],[9],[10]     2,944,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Bidwax, Non-durable Consumer Goods, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,436,000 [1],[2],[3],[23]     2,434,000 [5],[6],[8],[24]            
Total investments at fair value 2,255,000 [1],[2],[3],[23]     2,302,000 [5],[6],[8],[24]            
Investment, Identifier [Axis]: BigHand UK Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 830,000 [1],[2],[3],[19]     731,000 [5],[6],[8],[20]            
Total investments at fair value 786,000 [1],[2],[3],[19]     700,000 [5],[6],[8],[20]            
Investment, Identifier [Axis]: BigHand UK Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost 217,000 [1],[2],[3],[25]     99,000 [5],[6],[8],[11]            
Total investments at fair value 190,000 [1],[2],[3],[25]     93,000 [5],[6],[8],[11]            
Investment, Identifier [Axis]: BigHand UK Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 3                    
Schedule of Equity Method Investments [Line Items]                    
Cost [5],[6],[8],[26]       217,000            
Total investments at fair value [5],[6],[8],[26]       194,000            
Investment, Identifier [Axis]: Biolam Group, Consumer Non-cyclical, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,253,000 [1],[2],[3],[4],[9]     4,250,000 [5],[6],[7],[8],[18]            
Total investments at fair value $ 3,699,000 [1],[2],[3],[4],[9]     $ 4,117,000 [5],[6],[7],[8],[18]            
Investment, interest rate, paid in kind 2.80% [1],[2],[3],[4],[9]     2.80% [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: Biolam Group, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing $ 983,000     $ 1,006,000            
Investment, Identifier [Axis]: Blue Ribbon, LLC, Brewers, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 11,229,000 [1],[14]     11,380,000 [8],[15]            
Total investments at fair value 9,924,000 [1],[14]     9,970,000 [8],[15]            
Investment, Identifier [Axis]: Bounteous, Inc., Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 0     2,580,000            
Investment, Identifier [Axis]: Bounteous, Inc., Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,919,000 [1],[3],[10]     5,876,000 [6],[8],[11],[18]            
Total investments at fair value 7,647,000 [1],[3],[10]     5,488,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Bridger Aerospace Group Holdings, LLC, Environmental Industries, Municipal Revenue Bond                    
Schedule of Equity Method Investments [Line Items]                    
Cost 13,600,000     13,600,000            
Total investments at fair value 13,992,000     14,401,000            
Investment, Identifier [Axis]: Bridger Aerospace Group Holdings, LLC, Environmental Industries, Preferred Stock- Series C                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,776,000 [3]     7,776,000 [6]            
Total investments at fair value $ 7,088,000 [3]     $ 7,502,000 [6]            
Investment, interest rate, paid in kind 7.00% [3]     7.00% [6]            
Investment, Identifier [Axis]: BrightSign LLC, Media & Entertainment, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 3,770,000 [1],[3],[10]     $ 3,778,000 [6],[8],[11]            
Total investments at fair value 3,760,000 [1],[3],[10]     3,671,000 [6],[8],[11]            
Investment, Identifier [Axis]: BrightSign LLC, Media & Entertainment, LLC units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 596,000 [3],[12]     596,000 [6],[13]            
Total investments at fair value 543,000 [3],[12]     501,000 [6],[13]            
Investment, Identifier [Axis]: BrightSign LLC, Media & Entertainment, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 568,000 [1],[3],[9],[10]     472,000 [6],[8],[11],[18]            
Total investments at fair value 566,000 [1],[3],[9],[10]     452,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: BrightSign LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 143,000     238,000            
Investment, Identifier [Axis]: Brightline Trains Florida LLC, Transportation, Senior Secured Note                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,000,000 [3]     2,000,000 [6]            
Total investments at fair value 2,000,000 [3]     1,900,000 [6]            
Investment, Identifier [Axis]: Brightpay Limited, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 123,000     126,000            
Investment, Identifier [Axis]: Brightpay Limited, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,317,000 [1],[2],[3],[4],[9]     2,315,000 [5],[6],[7],[8],[18]            
Total investments at fair value 2,242,000 [1],[2],[3],[4],[9]     2,287,000 [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: British Airways 2020-1 Class B Pass Through Trust, Airlines, Structured Secured Note - Class B                    
Schedule of Equity Method Investments [Line Items]                    
Cost 569,000     596,000            
Total investments at fair value 590,000     610,000            
Investment, Identifier [Axis]: British Engineering Services Holdco Limited, Commercial Services & Supplies, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,386,000 [1],[2],[3],[27]     2,384,000 [5],[6],[8],[28]            
Total investments at fair value 2,276,000 [1],[2],[3],[27]     2,264,000 [5],[6],[8],[28]            
Investment, Identifier [Axis]: Burgess Point Purchaser Corporation, Auto Parts & Equipment, LP Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 227,000 [3],[12]     227,000 [6],[13]            
Total investments at fair value 242,000 [3],[12]     230,000 [6],[13]            
Investment, Identifier [Axis]: Burgess Point Purchaser Corporation, Auto Parts & Equipment, Second Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,196,000 [1],[3],[14]     2,194,000 [6],[8],[15]            
Total investments at fair value 2,241,000 [1],[3],[14]     2,184,000 [6],[8],[15]            
Investment, Identifier [Axis]: CAi Software, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 707,000     707,000            
Investment, Identifier [Axis]: CAi Software, LLC, Technology, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,656,000 [1],[3],[10]     3,663,000 [6],[8],[11]            
Total investments at fair value 3,635,000 [1],[3],[10]     3,477,000 [6],[8],[11]            
Investment, Identifier [Axis]: CAi Software, LLC, Technology, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,006,000 [1],[3],[10]     1,007,000 [6],[8],[11]            
Total investments at fair value 999,000 [1],[3],[10]     956,000 [6],[8],[11]            
Investment, Identifier [Axis]: CAi Software, LLC, Technology, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (10,000) [1],[3],[9],[10]     (10,000) [6],[8],[11],[18]            
Total investments at fair value (14,000) [1],[3],[9],[10]     (46,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: CCFF Buyer, LLC, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 2,027,000     0            
Investment, Identifier [Axis]: CCFF Buyer, LLC, Food & Beverage, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[9],[19] 2,146,000                  
Total investments at fair value [1],[3],[9],[19] 2,145,000                  
Investment, Identifier [Axis]: CCFF Buyer, LLC, Food & Beverage, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost [3],[12] 135,000                  
Total investments at fair value [3],[12] 135,000                  
Investment, Identifier [Axis]: CCFF Buyer, LLC, Food & Beverage, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[9],[19] (12,000)                  
Total investments at fair value [1],[3],[9],[19] (12,000)                  
Investment, Identifier [Axis]: CCFF Buyer, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 608,000     0            
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,839,000 [1],[3],[10]     5,018,000 [6],[8],[11]            
Total investments at fair value 4,806,000 [1],[3],[10]     4,990,000 [6],[8],[11]            
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,541,000 [1],[3],[10]     1,543,000 [6],[8],[11]            
Total investments at fair value 1,547,000 [1],[3],[10]     1,551,000 [6],[8],[11]            
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, Preferred Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 722,000 [3],[12]     722,000 [6],[13]            
Total investments at fair value 1,244,000 [3],[12]     1,190,000 [6],[13]            
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (22,000) [1],[3],[9],[10]     (24,000) [6],[8],[11],[18]            
Total investments at fair value (34,000) [1],[3],[9],[10]     (33,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: CGI Parent, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,653,000     1,653,000            
Investment, Identifier [Axis]: CSL DualCom, Capex / Acquisition Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 185,000     187,000            
Investment, Identifier [Axis]: CSL DualCom, Tele-communications, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,964,000 [1],[2],[3],[9],[32]     1,962,000 [5],[6],[8],[18],[33]            
Total investments at fair value 2,105,000 [1],[2],[3],[9],[32]     2,125,000 [5],[6],[8],[18],[33]            
Investment, Identifier [Axis]: CTI Foods Holdings Co., LLC, Food & Beverage, 2024 First Out Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] 1,782,000                  
Total investments at fair value [1],[3],[10] $ 1,875,000                  
Investment, interest rate, paid in kind [1],[3],[10] 15.30%                  
Investment, Identifier [Axis]: CTI Foods Holdings Co., LLC, Food & Beverage, 2024 LIFO Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] $ 3,567,000                  
Total investments at fair value [1],[3],[10] $ 3,750,000                  
Investment, interest rate, paid in kind [1],[3],[10] 15.30%                  
Investment, Identifier [Axis]: CTI Foods Holdings Co., LLC, Food & Beverage, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost [3],[12] $ 0                  
Total investments at fair value [3],[12] 595,000                  
Investment, Identifier [Axis]: CTI Foods Holdings Co., LLC, Food & Beverage, First Out Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] 715,000                  
Total investments at fair value [1],[3],[10] $ 715,000                  
Investment, interest rate, paid in kind [1],[3],[10] 15.30%                  
Investment, Identifier [Axis]: CTI Foods Holdings Co., LLC, Food & Beverage, Second Out Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] $ 535,000                  
Total investments at fair value [1],[3],[10] $ 535,000                  
Investment, interest rate, paid in kind [1],[3],[10] 17.30%                  
Investment, Identifier [Axis]: CW Group Holdings, LLC, High Tech Industries, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 403,000 [3],[12]     403,000 [6],[13]            
Total investments at fair value 742,000 [3],[12]     722,000 [6],[13]            
Investment, Identifier [Axis]: CW Group Holdings, LLC, High Tech Industries,First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,768,000 [1],[3],[10]     7,781,000 [6],[8],[11]            
Total investments at fair value 7,860,000 [1],[3],[10]     7,876,000 [6],[8],[11]            
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Healthcare, Class A Equity                    
Schedule of Equity Method Investments [Line Items]                    
Cost 389,000 [2],[3],[12]     389,000 [5],[6],[13]            
Total investments at fair value 0 [2],[3],[12]     0 [5],[6],[13]            
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Healthcare, Class C - Warrants                    
Schedule of Equity Method Investments [Line Items]                    
Cost 0 [2],[3],[12]     0 [5],[6],[13]            
Total investments at fair value 0 [2],[3],[12]     0 [5],[6],[13]            
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Healthcare, Class X Equity                    
Schedule of Equity Method Investments [Line Items]                    
Cost 35,000 [2],[3],[12]     35,000 [5],[6],[13]            
Total investments at fair value 0 [2],[3],[12]     0 [5],[6],[13]            
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,781,000 [1],[2],[3],[34]     1,780,000 [5],[6],[8],[35]            
Total investments at fair value $ 1,056,000 [1],[2],[3],[34]     $ 1,270,000 [5],[6],[8],[35]            
Investment, interest rate, paid in kind 9.00% [1],[2],[3],[34]     9.00% [5],[6],[8],[35]            
Investment, Identifier [Axis]: Caribou Holding Company, LLC, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 2,138,000 [1],[2],[3],[10]     $ 2,136,000 [5],[6],[8],[11]            
Total investments at fair value 2,120,000 [1],[2],[3],[10]     2,120,000 [5],[6],[8],[11]            
Investment, Identifier [Axis]: Caribou Holding Company, LLC, Technology, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 341,000 [2],[3],[12]     341,000 [5],[6],[13]            
Total investments at fair value 508,000 [2],[3],[12]     491,000 [5],[6],[13]            
Investment, Identifier [Axis]: Cascade Residential Services LLC, Electric, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,522,000 [1],[3],[9],[10]     1,286,000 [6],[8],[11],[18]            
Total investments at fair value 1,572,000 [1],[3],[9],[10]     1,284,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Cascade Residential Services LLC, Electric, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (4,000) [1],[3],[9],[10]     (4,000) [6],[8],[11],[18]            
Total investments at fair value 0 [1],[3],[9],[10]     (4,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: Cascade Residential Services, LLC, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 754,000     993,000            
Investment, Identifier [Axis]: Cascade Residential Services, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 165,000     165,000            
Investment, Identifier [Axis]: Celebration Bidco, LLC ,Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value 5,787,000 [36]     4,871,000 [36]   0 [37]        
Investment, Identifier [Axis]: Celebration Bidco, LLC, Chemicals, Plastics, & Rubber,First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,485,000 [3],[10]     2,486,000 [6],[11]            
Total investments at fair value 2,486,000 [3],[10]     2,486,000 [6],[11]            
Investment, Identifier [Axis]: Celebration Bidco, LLC, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value 2,486,000 [36]     2,486,000 [37]   0 [37]        
Investment, Identifier [Axis]: Celebration Bidco, LLC,Chemicals, Plastics, & Rubber,Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,871,000 [3],[12]     4,871,000 [6],[13]            
Total investments at fair value 5,787,000 [3],[12]     4,871,000 [6],[13]            
Investment, Identifier [Axis]: Ceres Pharma NV, Pharma-ceuticals, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 5,468,000 [1],[2],[3],[23]     5,462,000 [6],[8]            
Total investments at fair value 5,453,000 [1],[2],[3],[23]     5,466,000 [6],[8]            
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Hotel, Gaming & Leisure, Subordinated Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,809,000 [3]     7,798,000 [6]            
Total investments at fair value 7,839,000 [3]     7,824,000 [6]            
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Hotel, Gaming & Leisure, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,322,000 [3],[12]     5,472,000 [6],[13]            
Total investments at fair value 8,027,000 [3],[12]     6,080,000 [6],[13]            
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Hotel, Gaming & Leisure, Subordinated Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,463,000 [3]     3,459,000 [6]            
Total investments at fair value $ 3,441,000 [3]     $ 3,434,000 [6]            
Investment, interest rate, paid in kind 10.00% [3]     10.00% [6]            
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value $ 8,027,000 [36]     $ 6,080,000 [37]   0 [37]        
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Subordinated Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value 7,839,000 [36]     7,824,000 [36]   0 [37]        
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Subordinated Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value $ 3,441,000 [36]     $ 3,434,000 [36]   0 [37]        
Investment, interest rate, paid in kind 10.00% [36]     10.00%            
Investment, Identifier [Axis]: Cobham Slip Rings SAS, Diversified Manufacturing, Diversified Manufacturing                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 1,963,000 [1],[2],[3],[10]     $ 1,961,000 [5],[6],[8],[11]            
Total investments at fair value 1,995,000 [1],[2],[3],[10]     1,981,000 [5],[6],[8],[11]            
Investment, Identifier [Axis]: Compass Precision, LLC, Aerospace & Defense, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 125,000 [3],[12]     125,000 [6],[13]            
Total investments at fair value 145,000 [3],[12]     142,000 [6],[13]            
Investment, Identifier [Axis]: Compass Precision, LLC, Aerospace & Defense, Senior Subordinated Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 634,000 [3]     632,000 [6]            
Total investments at fair value $ 621,000 [3]     $ 622,000 [6]            
Investment, interest rate, paid in kind 1.00% [3]     1.00% [6]            
Investment, Identifier [Axis]: Comply365, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing $ 556,000     $ 556,000            
Investment, Identifier [Axis]: Comply365, LLC, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 6,565,000 [1],[3],[10]     6,593,000 [6],[8],[11]            
Total investments at fair value 6,540,000 [1],[3],[10]     6,561,000 [6],[8],[11]            
Investment, Identifier [Axis]: Comply365, LLC, Technology, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (8,000) [1],[3],[9],[10]     (8,000) [6],[8],[11],[18]            
Total investments at fair value (10,000) [1],[3],[9],[10]     (11,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: Contabo Finco S.À R.L, Internet Software & Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 909,000 [1],[2],[3],[4]     908,000 [5],[6],[7],[8]            
Total investments at fair value 1,006,000 [1],[2],[3],[4]     1,021,000 [5],[6],[7],[8]            
Investment, Identifier [Axis]: Core Scientific, Inc., Technology, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 9,712,000 [2],[12]     174,000 [5],[13]            
Total investments at fair value 9,936,000 [2],[12]     78,000 [5],[13]            
Investment, Identifier [Axis]: Core Scientific, Inc., Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [5],[6],[38]       17,383,000            
Total investments at fair value [5],[6],[38]       13,484,000            
Investment, Identifier [Axis]: Core Scientific, Inc., Technology, Warrants 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost [2],[12] 15,000                  
Total investments at fair value [2],[12] 18,000                  
Investment, Identifier [Axis]: Core Scientific, Inc., Technology, Warrants 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost [2],[12] 16,000                  
Total investments at fair value [2],[12] 27,000                  
Investment, Identifier [Axis]: Coyo Uprising GmbH, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 511,000     523,000            
Investment, Identifier [Axis]: Coyo Uprising GmbH, Technology, Class A Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 248,000 [2],[3],[12]     248,000 [5],[6],[13]            
Total investments at fair value 252,000 [2],[3],[12]     255,000 [5],[6],[13]            
Investment, Identifier [Axis]: Coyo Uprising GmbH, Technology, Class B Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 538,000 [2],[3],[12]     538,000 [5],[6],[13]            
Total investments at fair value 558,000 [2],[3],[12]     611,000 [5],[6],[13]            
Investment, Identifier [Axis]: Coyo Uprising GmbH, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 11,223,000 [1],[2],[3],[4],[9]     11,214,000 [5],[6],[7],[8],[18]            
Total investments at fair value $ 10,319,000 [1],[2],[3],[4],[9]     $ 10,542,000 [5],[6],[7],[8],[18]            
Investment, interest rate, paid in kind 3.40% [1],[2],[3],[4],[9]     3.40% [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: DISA Holdings Corp., Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing $ 0     $ 714,000            
Investment, Identifier [Axis]: DISA Holdings Corp., Other Industrial, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,555,000 [1],[3],[14]     3,846,000 [6],[8],[15],[18]            
Total investments at fair value 4,597,000 [1],[3],[14]     3,963,000 [6],[8],[15],[18]            
Investment, Identifier [Axis]: DISA Holdings Corp., Other Industrial, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (7,000) [1],[3],[9],[14]     53,000 [6],[8],[15],[18]            
Total investments at fair value (4,000) [1],[3],[9],[14]     60,000 [6],[8],[15],[18]            
Investment, Identifier [Axis]: DISA Holdings Corp., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 286,000     226,000            
Investment, Identifier [Axis]: DataServ Integrations, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 481,000     481,000            
Investment, Identifier [Axis]: DataServ Integrations, LLC, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,859,000 [1],[3],[10]     1,863,000 [6],[8],[11]            
Total investments at fair value 1,872,000 [1],[3],[10]     1,873,000 [6],[8],[11]            
Investment, Identifier [Axis]: DataServ Integrations, LLC, Technology, Partnership Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 96,000 [3],[12]     96,000 [6],[13]            
Total investments at fair value 97,000 [3],[12]     96,000 [6],[13]            
Investment, Identifier [Axis]: DataServ Integrations, LLC, Technology, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (8,000) [1],[3],[9],[10]     (8,000) [6],[8],[11],[18]            
Total investments at fair value (6,000) [1],[3],[9],[10]     (7,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 55,000 [3],[12]     55,000 [6],[13]            
Total investments at fair value 48,000 [3],[12]     41,000 [6],[13]            
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,631,000 [1],[3],[14]     1,644,000 [6],[8],[15]            
Total investments at fair value 1,626,000 [1],[3],[14]     1,638,000 [6],[8],[15]            
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 206,000 [1],[3],[9],[14]     (6,000) [6],[8],[15],[18]            
Total investments at fair value 204,000 [1],[3],[9],[14]     (9,000) [6],[8],[15],[18]            
Investment, Identifier [Axis]: DecksDirect, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 169,000     381,000            
Investment, Identifier [Axis]: Dragon Bidco, Technology, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,802,000 [1],[2],[3],[23]     4,798,000 [5],[6],[8],[24]            
Total investments at fair value 4,715,000 [1],[2],[3],[23]     4,812,000 [5],[6],[8],[24]            
Investment, Identifier [Axis]: Dune Group, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 688,000     704,000            
Investment, Identifier [Axis]: Dune Group, Health Care Equipment, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 188,000 [1],[2],[3],[4],[9]     187,000 [5],[6],[7],[8],[18]            
Total investments at fair value 167,000 [1],[2],[3],[4],[9]     180,000 [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: Dune Group, Health Care Equipment, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,445,000 [1],[2],[3],[10]     3,443,000 [5],[6],[8],[11]            
Total investments at fair value 3,368,000 [1],[2],[3],[10]     3,403,000 [5],[6],[8],[11]            
Investment, Identifier [Axis]: Dunlipharder B.V., Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 989,000 [1],[2],[3],[10]     988,000 [5],[6],[8],[11]            
Total investments at fair value 1,000,000 [1],[2],[3],[10]     993,000 [5],[6],[8],[11]            
Investment, Identifier [Axis]: Dwyer Instruments, Inc., Electric, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 11,190,000 [1],[3],[10]     11,206,000 [6],[8],[11],[18]            
Total investments at fair value 11,330,000 [1],[3],[10]     11,129,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: EFC International, Automotive, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 205,000 [3],[12]     205,000 [6],[13]            
Total investments at fair value 301,000 [3],[12]     268,000 [6],[13]            
Investment, Identifier [Axis]: EFC International, Automotive, Senior Unsecured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 679,000 [3]     675,000 [6]            
Total investments at fair value $ 685,000 [3]     $ 678,000 [6]            
Investment, interest rate, paid in kind 2.50% [3]     2.50% [6]            
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Diversified Manufacturing, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 7,902,000 [1],[3],[10]     $ 7,936,000 [6],[8],[11]            
Total investments at fair value 7,584,000 [1],[3],[10]     7,156,000 [6],[8],[11]            
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Diversified Manufacturing, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,230,000 [1],[3],[9],[10]     1,082,000 [6],[8],[11],[18]            
Total investments at fair value 1,178,000 [1],[3],[9],[10]     957,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 25,000     173,000            
Investment, Identifier [Axis]: EPS NASS Parent, Inc., Electrical Components & Equipment, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,321,000 [1],[3],[10]     4,330,000 [6],[8],[11]            
Total investments at fair value 4,224,000 [1],[3],[10]     4,187,000 [6],[8],[11]            
Investment, Identifier [Axis]: Echo Global Logistics, Inc., Air Transportation, Partnership Equity                    
Schedule of Equity Method Investments [Line Items]                    
Cost 289,000 [3],[12]     289,000 [6],[13]            
Total investments at fair value 259,000 [3],[12]     267,000 [6],[13]            
Investment, Identifier [Axis]: Echo Global Logistics, Inc., Air Transportation, Second Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,501,000 [1],[3],[10]     7,498,000 [6],[8],[11]            
Total investments at fair value 7,430,000 [1],[3],[10]     7,103,000 [6],[8],[11]            
Investment, Identifier [Axis]: Eclipse Business Capital Holdings LLC, Second Lien Senior Secured Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value               44,400,000    
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Banking, Finance, Insurance & Real Estate, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 45,934,000 [3]     45,934,000 [6]            
Total investments at fair value 70,716,000 [3]     72,041,000 [6]            
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Banking, Finance, Insurance & Real Estate, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,231,000 [3]     2,230,000 [6]            
Total investments at fair value 2,246,000 [3]     2,246,000 [6]            
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Banking, Finance, Insurance & Real Estate, Second Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,878,000 [3],[9],[14]     2,695,000 [6],[15],[18]            
Total investments at fair value 2,920,000 [3],[9],[14]     2,740,000 [6],[15],[18]            
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value 70,716,000 [36]     72,041,000 [37]   66,738,000 [37]        
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value 2,920,000 [36]     2,740,000 [36]   2,605,000 [37]        
Total unused commitments to extend financing 8,310,000     8,490,000            
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Second Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value 2,246,000 [36]     2,246,000 [36]   2,246,000 [37]        
Investment, Identifier [Axis]: Ellkay, LLC, Healthcare and Pharmaceuticals, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,631,000 [1],[3],[10]     3,646,000 [6],[8],[11]            
Total investments at fair value $ 3,276,000 [1],[3],[10]     3,341,000 [6],[8],[11]            
Investment, interest rate, paid in kind [1],[3],[10] 2.00%                  
Investment, Identifier [Axis]: Entact Environmental Services, Inc., Environmental Industries, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 4,268,000 [1],[3],[10]     4,447,000 [6],[8],[11]            
Total investments at fair value 4,241,000 [1],[3],[10]     4,475,000 [6],[8],[11]            
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Delayed Draw Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,780,000     1,821,000            
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 984,000 [1],[2],[3],[4]     943,000 [5],[6],[7],[8],[18]            
Total investments at fair value $ 769,000 [1],[2],[3],[4]     $ 698,000 [5],[6],[7],[8],[18]            
Investment, interest rate, paid in kind 2.80% [1],[2],[3],[4]     2.80% [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ (39,000) [1],[2],[3],[4]     $ 520,000 [5],[6],[8],[11]            
Total investments at fair value (452,000) [1],[2],[3],[4]     $ 467,000 [5],[6],[8],[11]            
Investment, interest rate, paid in kind [5],[6],[8],[11]       2.80%            
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, First Lien Senior Secured Term Loan 3                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[2],[3],[10] 521,000                  
Total investments at fair value [1],[2],[3],[10] $ 397,000                  
Investment, interest rate, paid in kind [1],[2],[3],[10] 2.80%                  
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, Second Lien Senior Secured Term Loan 3                    
Schedule of Equity Method Investments [Line Items]                    
Cost [5],[6],[8],[26]       $ 1,503,000            
Total investments at fair value [5],[6],[8],[26]       $ 1,397,000            
Investment, interest rate, paid in kind 2.80% [1],[2],[3],[25]     2.80% [5],[6],[8],[26]            
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, Second Lien Senior Secured Term Loan 4                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 1,504,000 [1],[2],[3],[25]     $ 394,000 [5],[6]            
Total investments at fair value $ 1,179,000 [1],[2],[3],[25]     $ 362,000 [5],[6]            
Investment, interest rate, paid in kind 11.50% [2],[3]     11.50% [5],[6]            
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, Senior Subordinated Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [2],[3] $ 411,000                  
Total investments at fair value [2],[3] 0                  
Investment, Identifier [Axis]: Events Software BidCo Pty Ltd, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 620,000     $ 620,000            
Investment, Identifier [Axis]: Events Software BidCo Pty Ltd, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,812,000 [1],[2],[3],[9],[29]     1,864,000 [5],[6],[8],[18],[30]            
Total investments at fair value 1,452,000 [1],[2],[3],[9],[29]     1,535,000 [5],[6],[8],[18],[30]            
Investment, Identifier [Axis]: Events Software BidCo Pty Ltd, Technology, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost [5],[6],[8],[30]       21,000            
Total investments at fair value [5],[6],[8],[30]       20,000            
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Consumer Cyclical, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,201,000 [1],[3],[10]     4,200,000 [6],[8],[11]            
Total investments at fair value 4,287,000 [1],[3],[10]     4,216,000 [6],[8],[11]            
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Consumer Cyclical, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 92,000 [1],[3],[9],[10]     91,000 [6],[8],[11],[18]            
Total investments at fair value 94,000 [1],[3],[9],[10]     92,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 77,000     77,000            
Investment, Identifier [Axis]: FSS Buyer LLC, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,485,000 [1],[3],[10]     7,499,000 [6],[8],[11]            
Total investments at fair value 7,587,000 [1],[3],[10]     7,573,000 [6],[8],[11]            
Investment, Identifier [Axis]: FSS Buyer LLC, Technology, LP Interest                    
Schedule of Equity Method Investments [Line Items]                    
Cost 20,000 [3],[12]     20,000 [6],[13]            
Total investments at fair value 25,000 [3],[12]     28,000 [6],[13]            
Investment, Identifier [Axis]: FSS Buyer LLC, Technology, LP Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 87,000 [3],[12]     87,000 [6],[13]            
Total investments at fair value 110,000 [3],[12]     122,000 [6],[13]            
Investment, Identifier [Axis]: Faraday, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 968,000     990,000            
Investment, Identifier [Axis]: Faraday, Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,593,000 [1],[2],[3],[4],[9]     1,591,000 [5],[6],[7],[8],[18]            
Total investments at fair value 1,601,000 [1],[2],[3],[4],[9]     1,632,000 [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: Ferrellgas L.P., Oil & Gas Equipment & Services, Opco Preferred Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,799,000 [3]     2,799,000 [6]            
Total investments at fair value 2,670,000 [3]     2,670,000 [6]            
Investment, Identifier [Axis]: FinThrive Software Intermediate Holdings Inc., Business Equipment & Services, Preferred Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,267,000 [3]     4,267,000 [6]            
Total investments at fair value $ 2,740,000 [3]     $ 2,551,000 [6]            
Investment, interest rate, paid in kind 11.00% [3]     11.00% [6]            
Investment, Identifier [Axis]: Finaxy Holding, Banking, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 4,281,000 [1],[2],[3],[4]     $ 4,278,000 [5],[6],[7],[8]            
Total investments at fair value 4,337,000 [1],[2],[3],[4]     4,421,000 [5],[6],[7],[8]            
Investment, Identifier [Axis]: Finaxy Holding, Banking, Subordinated Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 648,000 [2],[3]     648,000 [5],[6]            
Total investments at fair value $ 656,000 [2],[3]     $ 670,000 [5],[6]            
Investment, interest rate, paid in kind 10.30% [2],[3]     10.30% [5],[6]            
Investment, Identifier [Axis]: Fineline Technologies, Inc., Consumer Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 1,672,000 [1],[3],[10]     $ 1,688,000 [6],[8],[11]            
Total investments at fair value 1,688,000 [1],[3],[10]     1,704,000 [6],[8],[11]            
Investment, Identifier [Axis]: Finexvet, Consumer Cyclical, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [5],[6],[8],[18],[24]       1,779,000            
Total investments at fair value [5],[6],[8],[18],[24]       1,803,000            
Investment, Identifier [Axis]: Finexvet, Consumer Cyclical, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,857,000 [1],[2],[3],[4]     2,396,000 [5],[6],[8],[24]            
Total investments at fair value 4,752,000 [1],[2],[3],[4]     2,426,000 [5],[6],[8],[24]            
Investment, Identifier [Axis]: Finexvet, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 0     650,000            
Investment, Identifier [Axis]: FitzMark Buyer, LLC, Cargo & Transportation, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,398,000 [1],[3],[14]     2,403,000 [6],[8],[15]            
Total investments at fair value 2,389,000 [1],[3],[14]     2,370,000 [6],[8],[15]            
Investment, Identifier [Axis]: Five Star Holding LLC, Packaging, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 504,000 [3],[12]     504,000 [6],[13]            
Total investments at fair value 404,000 [3],[12]     446,000 [6],[13]            
Investment, Identifier [Axis]: Five Star Holding LLC, Packaging, Second Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,026,000 [1],[3],[10]     7,023,000 [6],[8],[11]            
Total investments at fair value 7,050,000 [1],[3],[10]     6,993,000 [6],[8],[11]            
Investment, Identifier [Axis]: Flexential Issuer, LLC, Information Technology, Structured Secured Note - Class C                    
Schedule of Equity Method Investments [Line Items]                    
Cost 9,292,000     9,289,000            
Total investments at fair value 8,924,000     8,242,000            
Investment, Identifier [Axis]: Flywheel Re Segregated Portfolio 2022-4, Investment Funds, Preferred Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,886,000 [2],[3],[12]     1,886,000 [5],[6],[13]            
Total investments at fair value 2,357,000 [2],[3],[12]     2,131,000 [5],[6],[13]            
Investment, Identifier [Axis]: Footco 40 Limited, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 519,000     524,000            
Investment, Identifier [Axis]: Footco 40 Limited, Media & Entertainment, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,849,000 [1],[2],[3],[9],[25]     1,847,000 [5],[6],[8],[18],[26]            
Total investments at fair value 1,779,000 [1],[2],[3],[9],[25]     1,808,000 [5],[6],[8],[18],[26]            
Investment, Identifier [Axis]: Forest Buyer, LLC, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 496,000     0            
Investment, Identifier [Axis]: Forest Buyer, LLC, Healthcare, Class A LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost [3],[12] 146,000                  
Total investments at fair value [3],[12] 146,000                  
Investment, Identifier [Axis]: Forest Buyer, LLC, Healthcare, Class B LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost [3],[12] 0                  
Total investments at fair value [3],[12] 0                  
Investment, Identifier [Axis]: Forest Buyer, LLC, Healthcare, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[9],[10] (12,000)                  
Total investments at fair value [1],[3],[9],[10] (12,000)                  
Investment, Identifier [Axis]: Forest Buyer, LLC, Healthcare, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] 1,548,000                  
Total investments at fair value [1],[3],[10] 1,548,000                  
Investment, Identifier [Axis]: Forest Buyer, LLC, Healthcare, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[9],[10] (7,000)                  
Total investments at fair value [1],[3],[9],[10] (7,000)                  
Investment, Identifier [Axis]: Forest Buyer, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 298,000     0            
Investment, Identifier [Axis]: Fortis Payment Systems, LLC, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 2,000     0            
Investment, Identifier [Axis]: Fortis Payment Systems, LLC, Other Financial, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,461,000 [1],[3],[9],[10]     2,443,000 [6],[8],[11],[18]            
Total investments at fair value 2,442,000 [1],[3],[9],[10]     2,480,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: FragilePak LLC, Transportation Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,252,000 [1],[3],[10]     7,243,000 [6],[8],[11]            
Total investments at fair value 6,706,000 [1],[3],[10]     7,037,000 [6],[8],[11]            
Investment, Identifier [Axis]: FragilePak LLC, Transportation Services, Partnership Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 889,000 [3],[12]     889,000 [6],[13]            
Total investments at fair value 391,000 [3],[12]     599,000 [6],[13]            
Investment, Identifier [Axis]: GB EAGLE BUYER, INC., Capital Goods, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 12,113,000 [1],[3],[10]     12,132,000 [6],[8],[11]            
Total investments at fair value 12,548,000 [1],[3],[10]     12,380,000 [6],[8],[11]            
Investment, Identifier [Axis]: GB EAGLE BUYER, INC., Capital Goods, Partnership Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 515,000 [3],[12]     515,000 [6],[13]            
Total investments at fair value 699,000 [3],[12]     659,000 [6],[13]            
Investment, Identifier [Axis]: GB EAGLE BUYER, INC., Capital Goods, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (45,000) [1],[3],[9],[10]     (48,000) [6],[8],[11],[18]            
Total investments at fair value 0 [1],[3],[9],[10]     (12,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,935,000     1,935,000            
Investment, Identifier [Axis]: GPNZ II GmbH, CAF Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 86,000     0            
Investment, Identifier [Axis]: GPNZ II GmbH, Healthcare, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 0 [2],[3],[12]     0 [5],[6],[13]            
Total investments at fair value 0 [2],[3],[12]     0 [5],[6],[13]            
Investment, Identifier [Axis]: GPNZ II GmbH, Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 446,000 [1],[2],[3],[9],[31],[39]     446,000 [5],[6],[8]            
Total investments at fair value 220,000 [1],[2],[3],[9],[31],[39]     265,000 [5],[6],[8]            
Investment, Identifier [Axis]: GPNZ II GmbH, Healthcare, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost 159,000 [1],[2],[3],[9],[39]     122,000 [5],[6]            
Total investments at fair value $ 158,000 [1],[2],[3],[9],[39]     $ 124,000 [5],[6]            
Investment, interest rate, paid in kind 10.00% [1],[2],[3],[9],[39]     10.00% [5],[6]            
Investment, Identifier [Axis]: GPNZ II GmbH, Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing $ 17,000     $ 53,000            
Investment, Identifier [Axis]: Global Academic Group Limited, Industrial Other, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,679,000 [1],[2],[3],[21]     1,677,000 [5],[6],[8]            
Total investments at fair value 1,583,000 [1],[2],[3],[21]     1,652,000 [5],[6],[8]            
Investment, Identifier [Axis]: Global Academic Group Limited, Industrial Other, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,823,000 [1],[2],[3],[9],[40]     2,819,000 [5],[6],[8],[18]            
Total investments at fair value 2,713,000 [1],[2],[3],[9],[40]     2,864,000 [5],[6],[8],[18]            
Investment, Identifier [Axis]: Global Academic Group Limited, Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 261,000     276,000            
Investment, Identifier [Axis]: Gojo Industries, Inc., Industrial Other, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,293,000 [1],[3],[10]     2,264,000 [6],[8],[11]            
Total investments at fair value $ 2,294,000 [1],[3],[10]     $ 2,261,000 [6],[8],[11]            
Investment, interest rate, paid in kind 4.50% [1],[3],[10]     4.50% [6],[8],[11]            
Investment, Identifier [Axis]: Greenhill II BV, Capex Acquisition Facility                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing $ 118,000     $ 120,000            
Investment, Identifier [Axis]: Greenhill II BV, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 815,000 [1],[2],[3],[4],[9]     815,000 [5],[6],[7],[8],[18]            
Total investments at fair value 888,000 [1],[2],[3],[4],[9]     894,000 [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: Groupe Guemas, Brokerage, Asset Managers & Exchanges, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,405,000 [1],[2],[3],[23]     2,403,000 [5],[6],[8],[24]            
Total investments at fair value 2,458,000 [1],[2],[3],[23]     2,503,000 [5],[6],[8],[24]            
Investment, Identifier [Axis]: Groupe Product Life, Consumer Non-cyclical, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,007,000 [1],[2],[3],[4]     1,006,000 [5],[6],[7],[8]            
Total investments at fair value 1,064,000 [1],[2],[3],[4]     1,059,000 [5],[6],[7],[8]            
Investment, Identifier [Axis]: Gusto Aus BidCo Pty Ltd, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 160,000     167,000            
Investment, Identifier [Axis]: Gusto Aus BidCo Pty Ltd., Consumer Non-Cyclical, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,085,000 [1],[2],[3],[9],[21]     2,083,000 [5],[6],[8],[18],[22]            
Total investments at fair value 2,109,000 [1],[2],[3],[9],[21]     2,235,000 [5],[6],[8],[18],[22]            
Investment, Identifier [Axis]: HEKA Invest, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 562,000     575,000            
Investment, Identifier [Axis]: HEKA Invest, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,482,000 [1],[2],[3],[4],[9]     4,478,000 [5],[6],[7],[8],[18]            
Total investments at fair value 5,059,000 [1],[2],[3],[4],[9]     5,080,000 [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: HTI Technology & Industries, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,023,000     1,023,000            
Investment, Identifier [Axis]: HTI Technology & Industries, Electronic Component Manufacturing, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (4,000) [1],[3],[9],[10]     (5,000) [6],[8],[11],[18]            
Total investments at fair value (14,000) [1],[3],[9],[10]     (3,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: HTI Technology & Industries, Electronic Component Manufacturing, Second Lien Note                    
Schedule of Equity Method Investments [Line Items]                    
Cost 5,664,000 [1],[3],[9],[10]     5,656,000 [6],[8],[11],[18]            
Total investments at fair value 5,570,000 [1],[3],[9],[10]     5,677,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: HTI Technology & Industries, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 682,000     682,000            
Investment, Identifier [Axis]: HeartHealth Bidco Pty Ltd, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 239,000     253,000            
Investment, Identifier [Axis]: HeartHealth Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 636,000 [1],[2],[3],[9],[21]     632,000 [5],[6],[8],[18],[22]            
Total investments at fair value 629,000 [1],[2],[3],[9],[21]     674,000 [5],[6],[8],[18],[22]            
Investment, Identifier [Axis]: Heartland Veterinary Partners, LLC, Healthcare, Subordinated Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,417,000 [3]     4,396,000 [6]            
Total investments at fair value $ 4,027,000 [3]     $ 3,936,000 [6]            
Investment, interest rate, paid in kind 11.00% [3]     11.00% [6]            
Investment, Identifier [Axis]: HemaSource, Inc, Healthcare, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 51,000 [3],[12]     $ 51,000 [6],[13]            
Total investments at fair value 53,000 [3],[12]     51,000 [6],[13]            
Investment, Identifier [Axis]: HemaSource, Inc, Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,549,000 [1],[3],[10]     3,546,000 [6],[8],[11]            
Total investments at fair value 3,597,000 [1],[3],[10]     3,550,000 [6],[8],[11]            
Investment, Identifier [Axis]: HemaSource, Inc, Healthcare, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 137,000 [1],[3],[9],[10]     170,000 [6],[8],[11],[18]            
Total investments at fair value 149,000 [1],[3],[9],[10]     171,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: HemaSource, Inc., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 744,000     710,000            
Investment, Identifier [Axis]: Home Care Assistance, LLC, Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,396,000 [1],[3],[10]     4,401,000 [6],[8],[11]            
Total investments at fair value 4,067,000 [1],[3],[10]     4,070,000 [6],[8],[11]            
Investment, Identifier [Axis]: HomeX Services Group LLC, Home Construction, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 509,000 [1],[3],[9],[14]     510,000 [6],[8],[15],[18]            
Total investments at fair value 524,000 [1],[3],[9],[14]     510,000 [6],[8],[15],[18]            
Investment, Identifier [Axis]: HomeX Services Group LLC, Home Construction, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (3,000) [1],[3],[9],[14]     (3,000) [6],[8],[15],[18]            
Total investments at fair value 0 [1],[3],[9],[14]     (3,000) [6],[8],[15],[18]            
Investment, Identifier [Axis]: HomeX Services Group, LLC, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 338,000     338,000            
Investment, Identifier [Axis]: HomeX Services Group, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 135,000     135,000            
Investment, Identifier [Axis]: Honour Lane Logistics Holdings Limited, Transportation Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 6,927,000 [1],[2],[3],[14]     6,920,000 [6],[8],[15]            
Total investments at fair value 6,807,000 [1],[2],[3],[14]     6,545,000 [6],[8],[15]            
Investment, Identifier [Axis]: Hygie 31 Holding, Pharma-ceuticals, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 254,000 [1],[2],[3],[23]     282,000 [5],[6],[8],[24]            
Total investments at fair value 288,000 [1],[2],[3],[23]     326,000 [5],[6],[8],[24]            
Investment, Identifier [Axis]: IM Square, Banking, Finance, Insurance & Real Estate, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,771,000 [1],[2],[3],[4]     3,768,000 [5],[6],[7],[8]            
Total investments at fair value 3,403,000 [1],[2],[3],[4]     3,472,000 [5],[6],[7],[8]            
Investment, Identifier [Axis]: INOS 19-090 GmbH, Acquisition Facility                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 0     971,000            
Investment, Identifier [Axis]: INOS 19-090 GmbH, Aerospace & Defense, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 922,000 [1],[2],[3],[4]     1,214,000 [5],[6],[7],[8],[18]            
Total investments at fair value 829,000 [1],[2],[3],[4]     1,155,000 [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: ISTO Technologies II, LLC, Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,209,000 [1],[3],[10]     2,207,000 [6],[8],[11]            
Total investments at fair value 2,214,000 [1],[3],[10]     2,205,000 [6],[8],[11]            
Investment, Identifier [Axis]: ISTO Technologies II, LLC, Healthcare, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (5,000) [1],[3],[9],[10]     (6,000) [6],[8],[11],[18]            
Total investments at fair value (5,000) [1],[3],[9],[10]     (6,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: ISTO Technologies II, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 238,000     238,000            
Investment, Identifier [Axis]: ITI Intermodal, Inc., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 595,000     595,000            
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 375,000 [3],[12]     375,000 [6],[13]            
Total investments at fair value 382,000 [3],[12]     357,000 [6],[13]            
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [6],[8],[11]       6,277,000            
Total investments at fair value [6],[8],[11]       6,306,000            
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] 696,000                  
Total investments at fair value [1],[3],[10] 690,000                  
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] 5,574,000                  
Total investments at fair value [1],[3],[10] 5,632,000                  
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 38,000 [1],[3],[9],[10]     37,000 [6],[8],[11],[18]            
Total investments at fair value 37,000 [1],[3],[9],[10]     34,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Ice House America, L.L.C., Consumer Products, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[9],[10] 2,016,000                  
Total investments at fair value [1],[3],[9],[10] 2,015,000                  
Investment, Identifier [Axis]: Ice House America, L.L.C., Consumer Products, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost [3] 135,000                  
Total investments at fair value [3] 135,000                  
Investment, Identifier [Axis]: Ice House America, L.L.C., Consumer Products, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[9],[10] 29,000                  
Total investments at fair value [1],[3],[9],[10] 29,000                  
Investment, Identifier [Axis]: Ice House America, L.L.C., Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 82,000     0            
Investment, Identifier [Axis]: Ice House America, L.L.C., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 191,000     0            
Investment, Identifier [Axis]: Infoblox, Inc., Technology, Second Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,833,000 [1],[19]     2,833,000 [8],[20]            
Total investments at fair value 2,846,000 [1],[19]     2,842,000 [8],[20]            
Investment, Identifier [Axis]: Infoniqa Holdings GmbH, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,697,000 [1],[2],[3],[23]     2,695,000 [5],[6],[8],[24]            
Total investments at fair value 2,627,000 [1],[2],[3],[23]     2,664,000 [5],[6],[8],[24]            
Investment, Identifier [Axis]: Innovad Group II BV, Beverage, Food & Tobacco, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 673,000 [1],[2],[3],[41]     673,000 [5],[6],[8],[42]            
Total investments at fair value 661,000 [1],[2],[3],[41]     684,000 [5],[6],[8],[42]            
Investment, Identifier [Axis]: Innovad Group II BV, Beverage, Food & Tobacco, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,520,000 [1],[2],[3],[9],[23]     4,517,000 [5],[6],[8],[18],[24]            
Total investments at fair value 4,151,000 [1],[2],[3],[9],[23]     4,099,000 [5],[6],[8],[18],[24]            
Investment, Identifier [Axis]: Innovad Group II BV, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 172,000     176,000            
Investment, Identifier [Axis]: Interstellar Group B.V., Delayed Draw Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 0     57,000            
Investment, Identifier [Axis]: Interstellar Group B.V., Delayed Draw Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 607,000     620,000            
Investment, Identifier [Axis]: Interstellar Group B.V., Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [5],[6],[7],[8],[18]       1,587,000            
Total investments at fair value [5],[6],[7],[8],[18]       1,676,000            
Investment, Identifier [Axis]: Interstellar Group B.V., Technology, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[2],[3],[4] 61,000                  
Total investments at fair value [1],[2],[3],[4] 64,000                  
Investment, Identifier [Axis]: Interstellar Group B.V., Technology, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[2],[3],[4],[9] 1,527,000                  
Total investments at fair value [1],[2],[3],[4],[9] 1,578,000                  
Investment, Identifier [Axis]: InvoCare Limited, Consumer Cyclical Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 790,000 [1],[2],[3],[9],[21]     789,000 [5],[6],[8],[18],[22]            
Total investments at fair value 788,000 [1],[2],[3],[9],[21]     820,000 [5],[6],[8],[18],[22]            
Investment, Identifier [Axis]: InvoCare Limited, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 148,000     155,000            
Investment, Identifier [Axis]: Isolstar Holding NV (IPCOM), Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 171,000     656,000            
Investment, Identifier [Axis]: Isolstar Holding NV (IPCOM), Trading Companies & Distributors, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,650,000 [1],[2],[3],[4],[9]     4,173,000 [5],[6],[7],[8],[18]            
Total investments at fair value 5,273,000 [1],[2],[3],[4],[9]     4,778,000 [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: JF Acquisition, LLC, Automotive, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,511,000 [1],[3],[10]     3,514,000 [6],[8],[11]            
Total investments at fair value 3,445,000 [1],[3],[10]     3,390,000 [6],[8],[11]            
Investment, Identifier [Axis]: JetBlue 2019-1 Class B Pass Through Trust, Airlines, Structured Secured Note - Class B                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,221,000     1,221,000            
Total investments at fair value 1,233,000     1,210,000            
Investment, Identifier [Axis]: Jon Bidco Limited, Capex & Acquisition Facility                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 316,000     334,000            
Investment, Identifier [Axis]: Jon Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,289,000 [1],[2],[3],[9],[40]     2,286,000 [5],[6],[8],[18],[43]            
Total investments at fair value 2,002,000 [1],[2],[3],[9],[40]     2,111,000 [5],[6],[8],[18],[43]            
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,425,000 [1],[3],[10]     3,422,000 [6],[8],[11]            
Total investments at fair value 3,439,000 [1],[3],[10]     3,413,000 [6],[8],[11]            
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 107,000 [3]     107,000 [6]            
Total investments at fair value 242,000 [3]     228,000 [6]            
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (5,000) [1],[3],[9],[10]     (6,000) [6],[8],[11],[18]            
Total investments at fair value (5,000) [1],[3],[9],[10]     (8,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 418,000     418,000            
Investment, Identifier [Axis]: Kano Laboratories LLC, Chemicals, Plastics & Rubber, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,610,000 [1],[3],[10]     4,839,000 [6],[8],[11],[18]            
Total investments at fair value 7,541,000 [1],[3],[10]     4,886,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Kano Laboratories LLC, Chemicals, Plastics & Rubber, Partnership Equity                    
Schedule of Equity Method Investments [Line Items]                    
Cost 79,000 [3],[12]     79,000 [6],[13]            
Total investments at fair value 84,000 [3],[12]     87,000 [6],[13]            
Investment, Identifier [Axis]: Kano Laboratories LLC, Delayed Draw Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 0     1,574,000            
Investment, Identifier [Axis]: Kano Laboratories LLC, Delayed Draw Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 0     1,203,000            
Investment, Identifier [Axis]: Kid Distro Holdings, LLC, Media & Entertainment, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 18,433,000 [1],[3],[10]     18,513,000 [6],[8],[11]            
Total investments at fair value 18,633,000 [1],[3],[10]     18,672,000 [6],[8],[11]            
Investment, Identifier [Axis]: Kid Distro Holdings, LLC, Media & Entertainment, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 851,000 [3],[12]     851,000 [6],[13]            
Total investments at fair value 808,000 [3],[12]     799,000 [6],[13]            
Investment, Identifier [Axis]: Kona Buyer, LLC, High Tech Industries, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 5,222,000 [1],[3],[10]     5,217,000 [6],[8],[11]            
Total investments at fair value 5,207,000 [1],[3],[10]     5,286,000 [6],[8],[11]            
Investment, Identifier [Axis]: Lambir Bidco Limited, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,096,000     1,121,000            
Investment, Identifier [Axis]: Lambir Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,581,000 [1],[2],[3],[4],[9]     3,576,000 [5],[6],[7],[8],[18]            
Total investments at fair value 3,258,000 [1],[2],[3],[4],[9]     3,380,000 [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: Lambir Bidco Limited, Healthcare, Second Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,226,000 [2],[3]     1,225,000 [5],[6]            
Total investments at fair value $ 1,086,000 [2],[3]     $ 1,123,000 [5],[6]            
Investment, interest rate, paid in kind 12.00% [2],[3]     12.00% [5],[6]            
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 10,690,000 [1],[3],[10]     $ 10,708,000 [6],[8],[11]            
Total investments at fair value 10,711,000 [1],[3],[10]     10,737,000 [6],[8],[11]            
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 63,000 [3]     63,000 [6]            
Total investments at fair value 129,000 [3]     180,000 [6]            
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (22,000) [1],[3],[9],[10]     289,000 [6],[8],[11],[18]            
Total investments at fair value (20,000) [1],[3],[9],[10]     300,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: LeadsOnline, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,952,000     1,640,000            
Investment, Identifier [Axis]: Learfield Communications, LLC, Broadcasting, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost [12] 2,209,000                  
Total investments at fair value [12] 3,342,000                  
Investment, Identifier [Axis]: Learfield Communications, LLC, Broadcasting, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,916,000 [1],[14]     3,925,000 [8],[15]            
Total investments at fair value 3,892,000 [1],[14]     3,778,000 [8],[15]            
Investment, Identifier [Axis]: Learfield Communications, LLC, Broadcasting, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost [6],[13]       2,209,000            
Total investments at fair value [6],[13]       2,872,000            
Investment, Identifier [Axis]: LivTech Purchaser, Inc., Business Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,305,000 [1],[3],[10]     3,303,000 [6],[8],[11]            
Total investments at fair value 3,314,000 [1],[3],[10]     3,310,000 [6],[8],[11]            
Investment, Identifier [Axis]: Long Term Care Group, Inc., Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 5,006,000 [1],[3],[14]     4,926,000 [6],[8],[15]            
Total investments at fair value $ 4,343,000 [1],[3],[14]     $ 3,813,000 [6],[8],[15]            
Investment, interest rate, paid in kind 6.00% [1],[3],[14]     6.00% [6],[8],[15]            
Investment, Identifier [Axis]: MB Purchaser, LLC, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing $ 515,000     $ 0            
Investment, Identifier [Axis]: MB Purchaser, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 103,000     0            
Investment, Identifier [Axis]: MB Purchaser, LLC, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] 596,000                  
Total investments at fair value [1],[3],[10] 595,000                  
Investment, Identifier [Axis]: MB Purchaser, LLC, Technology, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost [3],[12] 23,000                  
Total investments at fair value [3],[12] 23,000                  
Investment, Identifier [Axis]: MB Purchaser, LLC, Technology, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] (2,000)                  
Total investments at fair value [1],[3],[10] (2,000)                  
Investment, Identifier [Axis]: MC Group Ventures Corporation, Business Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,299,000 [1],[3],[9],[10]     4,306,000 [6],[8],[11],[18]            
Total investments at fair value 4,357,000 [1],[3],[9],[10]     4,352,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: MC Group Ventures Corporation, Business Services, Partnership Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 373,000 [3],[12]     373,000 [6],[13]            
Total investments at fair value 370,000 [3],[12]     389,000 [6],[13]            
Investment, Identifier [Axis]: MC Group Ventures Corporation, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 290,000     290,000            
Investment, Identifier [Axis]: MNS Buyer, Inc., Construction & Building, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 889,000 [1],[3],[14]     893,000 [6],[8],[15]            
Total investments at fair value 900,000 [1],[3],[14]     901,000 [6],[8],[15]            
Investment, Identifier [Axis]: MNS Buyer, Inc., Construction & Building, Partnership Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 77,000 [3],[12]     77,000 [6],[13]            
Total investments at fair value 88,000 [3],[12]     82,000 [6],[13]            
Investment, Identifier [Axis]: Marmoutier Holding B.V., Consumer Products Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 47,000 [1],[2],[3],[4],[9],[39]     47,000 [5],[6],[7],[8],[18]            
Total investments at fair value $ (35,000) [1],[2],[3],[4],[9],[39]     $ 9,000 [5],[6],[7],[8],[18]            
Investment, interest rate, paid in kind 9.60% [1],[2],[3],[4],[9],[39]     5.80% [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: Marmoutier Holding B.V., Consumer Products, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [5],[6],[7],[8],[18]       $ 2,437,000            
Total investments at fair value [5],[6],[7],[8],[18]       $ 1,793,000            
Investment, interest rate, paid in kind 10.60% [1],[2],[3],[4],[9],[39]     6.80% [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: Marmoutier Holding B.V., Consumer Products, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[2],[3],[4],[9],[39] $ 353,000                  
Total investments at fair value [1],[2],[3],[4],[9],[39] 163,000                  
Investment, Identifier [Axis]: Marmoutier Holding B.V., Consumer Products, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[2],[3],[4],[39] 2,062,000                  
Total investments at fair value [1],[2],[3],[4],[39] $ 932,000                  
Investment, interest rate, paid in kind [1],[2],[3],[4],[39] 10.60%                  
Investment, Identifier [Axis]: Marmoutier Holding B.V., Consumer Products, Super Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[2],[3],[4],[39] $ 185,000                  
Total investments at fair value [1],[2],[3],[4],[39] $ 185,000                  
Investment, interest rate, paid in kind [1],[2],[3],[4],[39] 9.90%                  
Investment, Identifier [Axis]: Marmoutier Holding B.V., Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing $ 24,000     $ 18,000            
Investment, Identifier [Axis]: Marmoutier Holding B.V., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 108,000     106,000            
Investment, Identifier [Axis]: Marshall Excelsior Co., Capital Goods, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 6,443,000 [1],[3],[10]     6,455,000 [6],[8],[11]            
Total investments at fair value 6,490,000 [1],[3],[10]     6,324,000 [6],[8],[11]            
Investment, Identifier [Axis]: Marshall Excelsior Co., Capital Goods, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,214,000 [1],[3],[9],[10]     1,180,000 [6],[8],[11],[18]            
Total investments at fair value 1,228,000 [1],[3],[9],[10]     1,157,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Marshall Excelsior Co., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 100,000     133,000            
Investment, Identifier [Axis]: Median B.V., Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,104,000 [1],[2],[27]     4,098,000 [5],[8],[28]            
Total investments at fair value 3,677,000 [1],[2],[27]     3,576,000 [5],[8],[28]            
Investment, Identifier [Axis]: Megawatt Acquisitionco, Inc., Aerospace & Defense, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost [3],[12] 10,000                  
Total investments at fair value [3],[12] 10,000                  
Investment, Identifier [Axis]: Megawatt Acquisitionco, Inc., Aerospace & Defense, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] 2,054,000                  
Total investments at fair value [1],[3],[10] 2,054,000                  
Investment, Identifier [Axis]: Megawatt Acquisitionco, Inc., Aerospace & Defense, Preferred Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost [3],[12] 92,000                  
Total investments at fair value [3],[12] 92,000                  
Investment, Identifier [Axis]: Megawatt Acquisitionco, Inc., Aerospace & Defense, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[9],[10] (7,000)                  
Total investments at fair value [1],[3],[9],[10] (7,000)                  
Investment, Identifier [Axis]: Megawatt Acquisitionco, Inc., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 332,000     0            
Investment, Identifier [Axis]: Mercell Holding AS, Capex Acquisition Facility                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 362,000     387,000            
Investment, Identifier [Axis]: Mercell Holding AS, Technology, Class A Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 56,000 [2],[3],[12]     56,000 [5],[6],[13]            
Total investments at fair value $ 61,000 [2],[3],[12]     $ 64,000 [5],[6],[13]            
Investment, interest rate, paid in kind 9.00% [2],[3],[12]     9.00% [5],[6],[13]            
Investment, Identifier [Axis]: Mercell Holding AS, Technology, Class B Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 0 [2],[3],[12]     $ 0 [5],[6],[13]            
Total investments at fair value 23,000 [2],[3],[12]     26,000 [5],[6],[13]            
Investment, Identifier [Axis]: Mercell Holding AS, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,570,000 [1],[2],[3],[9],[44]     1,568,000 [5],[6],[8],[18],[45]            
Total investments at fair value 1,427,000 [1],[2],[3],[9],[44]     1,521,000 [5],[6],[8],[18],[45]            
Investment, Identifier [Axis]: Modern Star Holdings Bidco Pty Limited, Non-durable Consumer Goods, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,249,000 [1],[2],[3],[9],[16]     2,245,000 [5],[6],[8],[17],[18]            
Total investments at fair value 2,045,000 [1],[2],[3],[9],[16]     2,134,000 [5],[6],[8],[17],[18]            
Investment, Identifier [Axis]: Modern Star Holdings Bidco Pty Limited, Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 323,000     338,000            
Investment, Identifier [Axis]: Modern Star Holdings Bidco Pty Limited, Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 73,000     77,000            
Investment, Identifier [Axis]: Moonlight Bidco Limited, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 557,000     562,000            
Investment, Identifier [Axis]: Moonlight Bidco Limited, Healthcare, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 138,000 [2],[3],[12]     138,000 [5],[6],[13]            
Total investments at fair value 167,000 [2],[3],[12]     1,380,000 [5],[6],[13]            
Investment, Identifier [Axis]: Moonlight Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,878,000 [1],[2],[3],[9],[25]     1,875,000 [5],[6],[8],[18],[26]            
Total investments at fair value 1,821,000 [1],[2],[3],[9],[25]     1,832,000 [5],[6],[8],[18],[26]            
Investment, Identifier [Axis]: Murphy Midco Limited, Media, Diversified & Production, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,858,000 [1],[2],[3],[27]     1,856,000 [5],[6],[8],[28]            
Total investments at fair value 1,853,000 [1],[2],[3],[27]     1,869,000 [5],[6],[8],[28]            
Investment, Identifier [Axis]: Music Reports, Inc., Media & Entertainment, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,976,000 [1],[3],[10]     4,970,000 [6],[8],[11]            
Total investments at fair value 4,820,000 [1],[3],[10]     5,003,000 [6],[8],[11]            
Investment, Identifier [Axis]: NAW Buyer LLC, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,918,000 [1],[3],[9],[10]     2,913,000 [6],[8],[11],[18]            
Total investments at fair value 2,986,000 [1],[3],[9],[10]     2,919,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: NAW Buyer LLC, Technology, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 95,000 [3],[12]     95,000 [6],[13]            
Total investments at fair value 86,000 [3],[12]     95,000 [6],[13]            
Investment, Identifier [Axis]: NAW Buyer LLC, Technology, Revolving                    
Schedule of Equity Method Investments [Line Items]                    
Cost 29,000 [1],[3],[9],[10]     67,000 [6],[8],[11],[18]            
Total investments at fair value 38,000 [1],[3],[9],[10]     67,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: NAW Buyer, LLC, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,515,000     1,515,000            
Investment, Identifier [Axis]: NAW Buyer, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 341,000     303,000            
Investment, Identifier [Axis]: NF Holdco, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 589,000     442,000            
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,110,000 [1],[3],[10]     4,116,000 [6],[8],[11]            
Total investments at fair value 4,179,000 [1],[3],[10]     4,136,000 [6],[8],[11]            
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 439,000 [3],[12]     438,000 [6],[13]            
Total investments at fair value 482,000 [3],[12]     422,000 [6],[13]            
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 129,000 [1],[3],[9],[10]     275,000 [6],[8],[11],[18]            
Total investments at fair value 147,000 [1],[3],[9],[10]     278,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: NPM Investments 28 B.V., Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,915,000 [1],[2],[3],[4],[9]     1,912,000 [5],[6],[7],[8],[18]            
Total investments at fair value 2,133,000 [1],[2],[3],[4],[9]     2,175,000 [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: NPM Investments 28 BV, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 468,000     479,000            
Investment, Identifier [Axis]: Napa Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,364,000 [1],[2],[3],[21]     7,356,000 [5],[6],[8],[22]            
Total investments at fair value 6,741,000 [1],[2],[3],[21]     6,870,000 [5],[6],[8],[22]            
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, Class A Preferred Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 239,000 [3],[12]     239,000 [6],[13]            
Total investments at fair value 285,000 [3],[12]     279,000 [6],[13]            
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, Class B Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 27,000 [3],[12]     27,000 [6],[13]            
Total investments at fair value 172,000 [3],[12]     119,000 [6],[13]            
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,652,000 [1],[3],[10]     2,883,000 [6],[8],[11]            
Total investments at fair value 2,683,000 [1],[3],[10]     2,901,000 [6],[8],[11]            
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (7,000) [1],[3],[9],[10]     (8,000) [6],[8],[11],[18]            
Total investments at fair value 0 [1],[3],[9],[10]     (4,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 684,000     684,000            
Investment, Identifier [Axis]: Navia Benefit Solutions, Inc., Healthcare & Pharmaceuticals First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 5,751,000 [1],[3],[14]     5,847,000 [6],[8],[15]            
Total investments at fair value $ 5,763,000 [1],[3],[14]     $ 5,855,000 [6],[8],[15]            
Investment, interest rate, paid in kind 3.00% [1],[3],[14]     3.00% [6],[8],[15]            
Investment, Identifier [Axis]: Navia Benefit Solutions, Inc., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 9,098,000 [1],[3],[14]     $ 9,090,000 [6],[8],[15]            
Total investments at fair value 9,078,000 [1],[3],[14]     9,004,000 [6],[8],[15]            
Investment, Identifier [Axis]: NeoxCo, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 486,000     497,000            
Investment, Identifier [Axis]: NeoxCo, Internet Software & Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,044,000 [1],[2],[3],[9],[23]     2,041,000 [5],[6],[8],[18],[24]            
Total investments at fair value 2,055,000 [1],[2],[3],[9],[23]     2,090,000 [5],[6],[8],[18],[24]            
Investment, Identifier [Axis]: Next Holdco, LLC, Delayed Draw Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 189,000     189,000            
Investment, Identifier [Axis]: Next Holdco, LLC, Delayed Draw Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 73,000     73,000            
Investment, Identifier [Axis]: Next Holdco, LLC, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 724,000 [1],[3],[9],[14]     724,000 [6],[8],[15],[18]            
Total investments at fair value 725,000 [1],[3],[9],[14]     724,000 [6],[8],[15],[18]            
Investment, Identifier [Axis]: Next Holdco, LLC, Technology, Revolving                    
Schedule of Equity Method Investments [Line Items]                    
Cost (1,000) [1],[3],[9],[14]     (1,000) [6],[8],[15],[18]            
Total investments at fair value (1,000) [1],[3],[9],[14]     (1,000) [6],[8],[15],[18]            
Investment, Identifier [Axis]: Northstar Recycling, LLC, Environmental Industries, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,856,000 [1],[3],[10]     3,862,000 [6],[8],[11]            
Total investments at fair value 3,905,000 [1],[3],[10]     3,888,000 [6],[8],[11]            
Investment, Identifier [Axis]: Novotech Aus Bidco Pty Ltd, Capex & Acquisition Facility                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,042,000     1,042,000            
Investment, Identifier [Axis]: Novotech Aus Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 6,637,000 [1],[2],[3],[9],[19]     6,629,000 [5],[6],[8],[18],[20]            
Total investments at fair value 6,754,000 [1],[2],[3],[9],[19]     6,695,000 [5],[6],[8],[18],[20]            
Investment, Identifier [Axis]: OA Buyer, Inc., Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 6,405,000 [1],[3],[14]     6,420,000 [6],[8],[15]            
Total investments at fair value 6,500,000 [1],[3],[14]     6,461,000 [6],[8],[15]            
Investment, Identifier [Axis]: OA Buyer, Inc., Healthcare, Partnership Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 211,000 [3],[12]     211,000 [6],[13]            
Total investments at fair value 318,000 [3],[12]     276,000 [6],[13]            
Investment, Identifier [Axis]: OA Buyer, Inc., Healthcare, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 159,000 [1],[3],[9],[14]     (19,000) [6],[8],[15],[18]            
Total investments at fair value 177,000 [1],[3],[9],[14]     (12,000) [6],[8],[15],[18]            
Investment, Identifier [Axis]: OA Buyer, Inc., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,154,000     1,331,000            
Investment, Identifier [Axis]: OAC Holdings I Corp, Automotive, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,762,000 [1],[3],[10]     1,761,000 [6],[8],[11]            
Total investments at fair value 1,763,000 [1],[3],[10]     1,727,000 [6],[8],[11]            
Investment, Identifier [Axis]: OAC Holdings I Corp, Automotive, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 138,000 [1],[3],[9],[10]     (10,000) [6],[8],[11],[18]            
Total investments at fair value 137,000 [1],[3],[9],[10]     (23,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: OAC Holdings I Corp, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 538,000     685,000            
Investment, Identifier [Axis]: OG III B.V., Containers & Glass Products, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,264,000 [1],[2],[3],[4]     7,259,000 [5],[6],[7],[8]            
Total investments at fair value 6,484,000 [1],[2],[3],[4]     6,632,000 [5],[6],[7],[8]            
Investment, Identifier [Axis]: ORTEC INTERNATIONAL NEWCO B.V. Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 974,000 [1],[2],[3],[4]     973,000 [5],[6],[7],[8]            
Total investments at fair value 965,000 [1],[2],[3],[4]     985,000 [5],[6],[7],[8]            
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 315,000     315,000            
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 6,753,000 [1],[3],[10]     6,763,000 [6],[8],[11]            
Total investments at fair value 6,733,000 [1],[3],[10]     6,733,000 [6],[8],[11]            
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, LP Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 138,000 [3]     138,000 [6]            
Total investments at fair value 143,000 [3]     138,000 [6]            
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (6,000) [1],[3],[9],[10]     (6,000) [6],[8],[11],[18]            
Total investments at fair value (4,000) [1],[3],[9],[10]     (6,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: Ocelot Holdco LLC, Construction Machinery, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 0 [3],[12]     0 [6],[13]            
Total investments at fair value 0 [3],[12]     0 [6],[13]            
Investment, Identifier [Axis]: Ocelot Holdco LLC, Construction Machinery, Preferred Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 273,000 [3]     273,000 [6]            
Total investments at fair value $ 359,000 [3]     $ 365,000 [6]            
Investment, interest rate, paid in kind 15.00% [3]     15.00% [6]            
Investment, Identifier [Axis]: Ocelot Holdco LLC, Construction Machinery, Super Senior Takeback Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 96,000 [3]     $ 96,000 [6]            
Total investments at fair value 96,000 [3]     96,000 [6]            
Investment, Identifier [Axis]: Ocelot Holdco LLC, Construction Machinery, Takeback Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 513,000 [3]     513,000 [6]            
Total investments at fair value 513,000 [3]     513,000 [6]            
Investment, Identifier [Axis]: Ocular Therapeutix, Inc, Pharmaceuticals, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,911,000 [1],[2],[3],[14]     1,909,000 [5],[6],[8],[15]            
Total investments at fair value 1,906,000 [1],[2],[3],[14]     1,906,000 [5],[6],[8],[15]            
Investment, Identifier [Axis]: Omni Intermediate Holdings, LLC, Transportation, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [6],[8],[11]       10,616,000            
Total investments at fair value [6],[8],[11]       10,082,000            
Investment, Identifier [Axis]: Oracle Vision Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,467,000 [1],[2],[3],[27]     1,466,000 [5],[6],[8],[28]            
Total investments at fair value 1,340,000 [1],[2],[3],[27]     1,353,000 [5],[6],[8],[28]            
Investment, Identifier [Axis]: Origin Bidco Limited, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 354,000 [1],[2],[3],[4]     354,000 [5],[6],[7],[8]            
Total investments at fair value 320,000 [1],[2],[3],[4]     326,000 [5],[6],[7],[8]            
Investment, Identifier [Axis]: Origin Bidco Limited, Technology, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 523,000 [1],[2],[3],[10]     523,000 [5],[6],[8],[11]            
Total investments at fair value 533,000 [1],[2],[3],[10]     531,000 [5],[6],[8],[11]            
Investment, Identifier [Axis]: PDQ.Com Corporation, Business Equipment & Services, Class A-2 Partnership Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 86,000 [3]     86,000 [6]            
Total investments at fair value 139,000 [3]     131,000 [6]            
Investment, Identifier [Axis]: PDQ.Com Corporation, Business Equipment & Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 12,465,000 [1],[3],[10]     12,490,000 [6],[8],[11]            
Total investments at fair value 12,560,000 [1],[3],[10]     12,648,000 [6],[8],[11]            
Investment, Identifier [Axis]: PSP Intermediate 4, LLC, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 202,000     206,000            
Investment, Identifier [Axis]: PSP Intermediate 4, LLC, Technology First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,392,000 [1],[2],[3],[14]     1,391,000 [5],[6],[8],[15]            
Total investments at fair value 1,343,000 [1],[2],[3],[14]     1,305,000 [5],[6],[8],[15]            
Investment, Identifier [Axis]: PSP Intermediate 4, LLC, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 843,000 [1],[2],[3],[9],[31]     842,000 [5],[6],[8],[18],[46]            
Total investments at fair value 831,000 [1],[2],[3],[9],[31]     820,000 [5],[6],[8],[18],[46]            
Investment, Identifier [Axis]: Panoche Energy Center LLC, Electric, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,699,000 [3]     3,970,000 [6]            
Total investments at fair value 3,933,000 [3]     4,224,000 [6]            
Investment, Identifier [Axis]: Parkview Dental Holdings LLC, Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [6],[8],[11],[18]       485,000            
Total investments at fair value [6],[8],[11],[18]       484,000            
Investment, Identifier [Axis]: Parkview Dental Holdings LLC, Healthcare, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] 467,000                  
Total investments at fair value [1],[3],[10] 468,000                  
Investment, Identifier [Axis]: Parkview Dental Holdings LLC, Healthcare, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[9],[10] 18,000                  
Total investments at fair value [1],[3],[9],[10] 18,000                  
Investment, Identifier [Axis]: Parkview Dental Holdings LLC, Healthcare, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 238,000 [3],[12]     238,000 [6],[13]            
Total investments at fair value 234,000 [3],[12]     238,000 [6],[13]            
Investment, Identifier [Axis]: Parkview Dental Holdings, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 262,000     262,000            
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class A                    
Schedule of Equity Method Investments [Line Items]                    
Cost 137,000 [2],[3]     137,000 [5],[6]            
Total investments at fair value 132,000 [2],[3]     129,000 [5],[6]            
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class B                    
Schedule of Equity Method Investments [Line Items]                    
Cost 137,000 [2],[3]     137,000 [5],[6]            
Total investments at fair value 132,000 [2],[3]     131,000 [5],[6]            
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class C                    
Schedule of Equity Method Investments [Line Items]                    
Cost 137,000 [2],[3]     137,000 [5],[6]            
Total investments at fair value 132,000 [2],[3]     126,000 [5],[6]            
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class D                    
Schedule of Equity Method Investments [Line Items]                    
Cost 137,000 [2],[3]     137,000 [5],[6]            
Total investments at fair value 131,000 [2],[3]     125,000 [5],[6]            
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class E                    
Schedule of Equity Method Investments [Line Items]                    
Cost 6,986,000 [2],[3]     6,986,000 [5],[6]            
Total investments at fair value 6,700,000 [2],[3]     6,406,000 [5],[6]            
Investment, Identifier [Axis]: Permaconn BidCo Pty Ltd, Tele-communications, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,750,000 [1],[2],[3],[21]     4,746,000 [5],[6],[8],[22]            
Total investments at fair value 4,652,000 [1],[2],[3],[21]     4,823,000 [5],[6],[8],[22]            
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Capital Equipment, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,879,000 [1],[3],[10]     1,882,000 [6],[8],[11]            
Total investments at fair value 1,904,000 [1],[3],[10]     1,909,000 [6],[8],[11]            
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Capital Equipment, Partnership Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 370,000 [3]     370,000 [6]            
Total investments at fair value 605,000 [3]     643,000 [6]            
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Capital Equipment, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (3,000) [1],[3],[9],[10]     (4,000) [6],[8],[11],[18]            
Total investments at fair value 0 [1],[3],[9],[10]     0 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 273,000     273,000            
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 21,391,000 [1],[3],[10]     21,138,000 [6],[8],[11]            
Total investments at fair value $ 21,393,000 [1],[3],[10]     $ 21,140,000 [6],[8],[11]            
Investment, interest rate, paid in kind 4.00% [1],[3],[10]     4.00% [6],[8],[11]            
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class A                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 0 [3],[12]     $ 0 [6],[13]            
Total investments at fair value 544,000 [3],[12]     543,000 [6],[13]            
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class B                    
Schedule of Equity Method Investments [Line Items]                    
Cost 0 [3],[12]     0 [6],[13]            
Total investments at fair value 183,000 [3],[12]     183,000 [6],[13]            
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class CC                    
Schedule of Equity Method Investments [Line Items]                    
Cost 0 [3],[12]     0 [6],[13]            
Total investments at fair value 0 [3],[12]     0 [6],[13]            
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class D                    
Schedule of Equity Method Investments [Line Items]                    
Cost 0 [3],[12]     0 [6],[13]            
Total investments at fair value 53,000 [3],[12]     52,000 [6],[13]            
Investment, Identifier [Axis]: Premium Franchise Brands, LLC, Research & Consulting Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [6],[8],[11]       11,555,000            
Total investments at fair value [6],[8],[11]       11,620,000            
Investment, Identifier [Axis]: Premium Franchise Brands, LLC, Research & Consulting Services, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] 2,453,000                  
Total investments at fair value [1],[3],[10] 2,471,000                  
Investment, Identifier [Axis]: Premium Franchise Brands, LLC, Research & Consulting Services, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] 9,084,000                  
Total investments at fair value [1],[3],[10] 9,160,000                  
Investment, Identifier [Axis]: Premium Invest, Acquisition Facility                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 418,000     428,000            
Investment, Identifier [Axis]: Premium Invest, Brokerage, Asset Managers & Exchanges, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,213,000 [1],[2],[3],[9],[23]     2,139,000 [5],[6],[8],[18],[24]            
Total investments at fair value 2,230,000 [1],[2],[3],[9],[23]     2,258,000 [5],[6],[8],[18],[24]            
Investment, Identifier [Axis]: Preqin MC Limited, Banking, Finance, Insurance & Real Estate, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,083,000 [1],[2],[3],[19]     3,080,000 [5],[6],[8],[20]            
Total investments at fair value 3,147,000 [1],[2],[3],[19]     3,135,000 [5],[6],[8],[20]            
Investment, Identifier [Axis]: Process Insights Acquisition, Inc, Electronics, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 188,000 [3],[12]     188,000 [6],[13]            
Total investments at fair value 226,000 [3],[12]     227,000 [6],[13]            
Investment, Identifier [Axis]: Process Insights Acquisition, Inc, Electronics, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [6],[8],[11],[18]       3,458,000            
Total investments at fair value [6],[8],[11],[18]       3,529,000            
Investment, Identifier [Axis]: Process Insights Acquisition, Inc, Electronics, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[9],[10] (10,000)                  
Total investments at fair value [1],[3],[9],[10] 4,000                  
Investment, Identifier [Axis]: Process Insights Acquisition, Inc, Electronics, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] 3,464,000                  
Total investments at fair value [1],[3],[10] 3,570,000                  
Investment, Identifier [Axis]: Process Insights Acquisition, Inc, Electronics, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 86,000 [1],[3],[9],[10]     (16,000) [6],[8],[11],[18]            
Total investments at fair value 106,000 [1],[3],[9],[10]     (4,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 623,000     623,000            
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Revolver 1                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 0     676,000            
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Revolver 2                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 575,000     0            
Investment, Identifier [Axis]: ProfitOptics, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 35,000     84,000            
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 641,000 [1],[3],[19]     644,000 [6],[8],[20]            
Total investments at fair value 650,000 [1],[3],[19]     654,000 [6],[8],[20]            
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 65,000 [3],[12]     65,000 [6],[13]            
Total investments at fair value 88,000 [3],[12]     88,000 [6],[13]            
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 156,000 [1],[3],[9],[19]     107,000 [6],[8],[18],[20]            
Total investments at fair value 158,000 [1],[3],[9],[19]     110,000 [6],[8],[18],[20]            
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, Second Lien Senior Subordinated Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 32,000 [3]     32,000 [6]            
Total investments at fair value 29,000 [3]     29,000 [6]            
Investment, Identifier [Axis]: Protego Bidco B.V., Aerospace & Defense Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 791,000 [1],[2],[3],[23]     791,000 [5],[6],[8],[24]            
Total investments at fair value 722,000 [1],[2],[3],[23]     731,000 [5],[6],[8],[24]            
Investment, Identifier [Axis]: Protego Bidco B.V., Aerospace & Defense, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 456,000 [1],[2],[3],[9],[23]     419,000 [5],[6],[8],[18],[24]            
Total investments at fair value 418,000 [1],[2],[3],[9],[23]     394,000 [5],[6],[8],[18],[24]            
Investment, Identifier [Axis]: Protego Bidco B.V., Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 135,000     174,000            
Investment, Identifier [Axis]: QPE7 SPV1 BidCo Pty Ltd, Consumer Cyclical, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,013,000 [1],[2],[3],[16]     3,011,000 [5],[6],[8],[17]            
Total investments at fair value 2,731,000 [1],[2],[3],[16]     2,838,000 [5],[6],[8],[17]            
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,000 [3],[12]     3,000 [6],[13]            
Total investments at fair value 85,000 [3],[12]     64,000 [6],[13]            
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical Preferred Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 144,000 [3],[12]     143,000 [6],[13]            
Total investments at fair value $ 163,000 [3],[12]     $ 159,000 [6],[13]            
Investment, interest rate, paid in kind 10.00% [3],[12]     10.00% [6],[13]            
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ (6,000) [1],[3],[9],[10]     $ (6,000) [6],[8],[11],[18]            
Total investments at fair value (5,000) [1],[3],[9],[10]     (2,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 584,000 [1],[3],[10]     586,000 [6],[8],[11]            
Total investments at fair value 588,000 [1],[3],[10]     592,000 [6],[8],[11]            
Investment, Identifier [Axis]: Qualified Industries, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 242,000     242,000            
Investment, Identifier [Axis]: Questel Unite, Business Services First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 366,000 [1],[2],[3],[10]     366,000 [5],[6],[8],[11]            
Total investments at fair value $ 361,000 [1],[2],[3],[10]     357,000 [5],[6],[8],[11]            
Investment, interest rate, paid in kind [1],[2],[3],[10] 2.40%                  
Investment, Identifier [Axis]: Questel Unite, Business Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 2,479,000 [1],[2],[3],[4],[9]     2,473,000 [5],[6],[7],[8],[18]            
Total investments at fair value $ 2,224,000 [1],[2],[3],[4],[9]     2,204,000 [5],[6],[7],[8],[18]            
Investment, interest rate, paid in kind [1],[2],[3],[4],[9] 2.40%                  
Investment, Identifier [Axis]: Questel Unite, Incremental Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing $ 2,796,000     2,860,000            
Investment, Identifier [Axis]: R1 Holdings, LLC, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 841,000     841,000            
Investment, Identifier [Axis]: R1 Holdings, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 973,000     973,000            
Investment, Identifier [Axis]: R1 Holdings, LLC, Transportation Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 34,000 [1],[3],[9],[19]     33,000 [6],[8],[18],[20]            
Total investments at fair value 59,000 [1],[3],[9],[19]     40,000 [6],[8],[18],[20]            
Investment, Identifier [Axis]: R1 Holdings, LLC, Transportation, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 5,389,000 [1],[3],[9],[19]     5,383,000 [6],[8],[18],[20]            
Total investments at fair value 5,605,000 [1],[3],[9],[19]     5,426,000 [6],[8],[18],[20]            
Investment, Identifier [Axis]: REP SEKO MERGER SUB LLC, Air Freight & Logistics First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,993,000 [1],[3],[4]     1,991,000 [6],[7],[8]            
Total investments at fair value 2,014,000 [1],[3],[4]     2,058,000 [6],[7],[8]            
Investment, Identifier [Axis]: REP SEKO MERGER SUB LLC, Air Freight & Logistics First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,882,000 [1],[3],[10]     1,885,000 [6],[8],[11]            
Total investments at fair value 1,851,000 [1],[3],[10]     1,854,000 [6],[8],[11]            
Investment, Identifier [Axis]: REP SEKO MERGER SUB LLC, Air Freight & Logistics, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,360,000 [1],[3],[4]     7,374,000 [6],[7],[8]            
Total investments at fair value 6,719,000 [1],[3],[4]     6,883,000 [6],[7],[8]            
Investment, Identifier [Axis]: RPX Corporation, Research & Consulting Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 8,191,000 [1],[3],[10]     8,815,000 [6],[8],[11]            
Total investments at fair value 8,262,000 [1],[3],[10]     8,853,000 [6],[8],[11]            
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers Partnership Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 400,000 [3],[12]     400,000 [6],[13]            
Total investments at fair value 401,000 [3],[12]     427,000 [6],[13]            
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 337,000 [1],[3],[9],[10]     370,000 [6],[8],[11],[18]            
Total investments at fair value 369,000 [1],[3],[9],[10]     379,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [6],[8],[11],[18]       9,547,000            
Total investments at fair value [6],[8],[11],[18]       9,601,000            
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[9],[10] 368,000                  
Total investments at fair value [1],[3],[9],[10] 377,000                  
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] 9,574,000                  
Total investments at fair value [1],[3],[10] 9,757,000                  
Investment, Identifier [Axis]: Randys Holdings, Inc., Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 2,912,000     3,309,000            
Investment, Identifier [Axis]: Randys Holdings, Inc., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,030,000     995,000            
Investment, Identifier [Axis]: Recovery Point Systems, Inc., Technology Partnership Equity                    
Schedule of Equity Method Investments [Line Items]                    
Cost 81,000 [3],[12]     81,000 [6],[13]            
Total investments at fair value 42,000 [3],[12]     45,000 [6],[13]            
Investment, Identifier [Axis]: Recovery Point Systems, Inc., Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,899,000 [1],[3],[10]     4,920,000 [6],[8],[11]            
Total investments at fair value 4,943,000 [1],[3],[10]     4,969,000 [6],[8],[11]            
Investment, Identifier [Axis]: Renovation Parent Holdings, LLC, Home Furnishings Partnership Equity                    
Schedule of Equity Method Investments [Line Items]                    
Cost 395,000 [3],[12]     395,000 [6],[13]            
Total investments at fair value 118,000 [3],[12]     134,000 [6],[13]            
Investment, Identifier [Axis]: Renovation Parent Holdings, LLC, Home Furnishings, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,424,000 [1],[3],[10]     7,416,000 [6],[8],[11]            
Total investments at fair value 6,647,000 [1],[3],[10]     6,609,000 [6],[8],[11]            
Investment, Identifier [Axis]: Resonetics, LLC, Health Care Equipment, Second Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,832,000 [1],[3],[10]     1,831,000 [6],[8],[11]            
Total investments at fair value 1,859,000 [1],[3],[10]     1,850,000 [6],[8],[11]            
Investment, Identifier [Axis]: Rocade Holdings LLC                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 4,500,000                  
Investment, Identifier [Axis]: Rocade Holdings LLC, Common LP Units                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value 822,000 [36]     546,000 [36]   0 [37]        
Investment, Identifier [Axis]: Rocade Holdings LLC, Other Financial, LP Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 0 [3],[12]     0 [6],[13]            
Total investments at fair value 822,000 [3],[12]     546,000 [6],[13]            
Investment, Identifier [Axis]: Rocade Holdings LLC, Other Financial, Preferred LP Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 56,817,000 [3],[9],[10]     55,258,000 [6],[11],[18]            
Total investments at fair value $ 56,817,000 [3],[9],[10]     $ 55,258,000 [6],[11],[18]            
Investment, interest rate, paid in kind 11.30% [3],[9],[10]     11.30% [6],[11],[18]            
Investment, Identifier [Axis]: Rocade Holdings LLC, Preferred Equity                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing $ 4,500,000     $ 4,500,000            
Investment, Identifier [Axis]: Rocade Holdings LLC, Preferred L.P. Units                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value $ 56,817,000 [36]     $ 55,258,000 [36]   0 [37]        
Investment, interest rate, paid in kind 11.30% [36]     11.30% [37]            
Investment, Identifier [Axis]: Rock Labor LLC, Media: Diversified & Production, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 3,626,000 [1],[3],[14]     $ 3,632,000 [6],[8],[15]            
Total investments at fair value 3,639,000 [1],[3],[14]     3,638,000 [6],[8],[15]            
Investment, Identifier [Axis]: Rock Labor LLC, Media: Diversified & Production, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 709,000 [3],[12]     709,000 [6],[13]            
Total investments at fair value 694,000 [3],[12]     869,000 [6],[13]            
Investment, Identifier [Axis]: Rock Labor LLC, Media: Diversified & Production, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (17,000) [1],[3],[9],[14]     (17,000) [6],[8],[15],[18]            
Total investments at fair value (15,000) [1],[3],[9],[14]     (17,000) [6],[8],[15],[18]            
Investment, Identifier [Axis]: Rock Labor, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 625,000     625,000            
Investment, Identifier [Axis]: Royal Buyer, LLC, Delayed Draw Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 461,000     461,000            
Investment, Identifier [Axis]: Royal Buyer, LLC, Industrial Other Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (14,000) [1],[3],[9],[10]     190,000 [6],[8],[11],[18]            
Total investments at fair value (9,000) [1],[3],[9],[10]     194,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Royal Buyer, LLC, Industrial Other, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [6],[8],[11],[18]       625,000            
Total investments at fair value [6],[8],[11],[18]       630,000            
Investment, Identifier [Axis]: Royal Buyer, LLC, Industrial Other, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 6,007,000 [1],[3],[9],[10]     5,377,000 [6],[8],[11]            
Total investments at fair value 6,043,000 [1],[3],[9],[10]     5,406,000 [6],[8],[11]            
Investment, Identifier [Axis]: Royal Buyer, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 874,000     670,000            
Investment, Identifier [Axis]: SBP Holdings LP, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 0     75,000            
Investment, Identifier [Axis]: SBP Holdings LP, Industrial Other Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 162,000 [1],[3],[9],[10]     (16,000) [6],[8],[11],[18]            
Total investments at fair value 177,000 [1],[3],[9],[10]     (10,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: SBP Holdings LP, Industrial Other, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 6,703,000 [1],[3],[10]     6,634,000 [6],[8],[11],[18]            
Total investments at fair value 6,973,000 [1],[3],[10]     6,721,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: SBP Holdings LP, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 355,000     532,000            
Investment, Identifier [Axis]: SISU ACQUISITIONCO., INC., Aerospace & Defense, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,940,000 [1],[3],[9],[14]     4,791,000 [6],[8],[15],[18]            
Total investments at fair value 4,726,000 [1],[3],[9],[14]     4,572,000 [6],[8],[15],[18]            
Investment, Identifier [Axis]: SISU ACQUISITIONCO., INC., Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 156,000     312,000            
Investment, Identifier [Axis]: SN BUYER, LLC, Health Care Services First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost [6],[8],[11]       1,852,000            
Total investments at fair value [6],[8],[11]       1,857,000            
Investment, Identifier [Axis]: SN BUYER, LLC, Health Care Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [6],[8],[11]       4,352,000            
Total investments at fair value [6],[8],[11]       4,346,000            
Investment, Identifier [Axis]: SSCP Pegasus Midco Limited, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,237,000     1,487,000            
Investment, Identifier [Axis]: SSCP Pegasus Midco Limited, Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,009,000 [1],[2],[3],[9],[25]     769,000 [5],[6],[8],[18],[26]            
Total investments at fair value 1,014,000 [1],[2],[3],[9],[25]     786,000 [5],[6],[8],[18],[26]            
Investment, Identifier [Axis]: SSCP Spring Bidco 3 Limited, Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 933,000 [1],[2],[3],[27]     932,000 [5],[6],[8],[28]            
Total investments at fair value 942,000 [1],[2],[3],[27]     947,000 [5],[6],[8],[28]            
Investment, Identifier [Axis]: SVI International LLC, Automotive, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[9],[14] 629,000                  
Total investments at fair value [1],[3],[9],[14] 629,000                  
Investment, Identifier [Axis]: SVI International LLC, Automotive, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost [3],[12] 208,000                  
Total investments at fair value [3],[12] 208,000                  
Investment, Identifier [Axis]: SVI International LLC, Automotive, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[9],[14] (1,000)                  
Total investments at fair value [1],[3],[9],[14] (1,000)                  
Investment, Identifier [Axis]: SVI International LLC, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 74,000     0            
Investment, Identifier [Axis]: SVI International LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 74,000     0            
Investment, Identifier [Axis]: Safety Products Holdings, LLC, Non-durable Consumer Goods Preferred Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 87,000 [3],[12]     87,000 [6],[13]            
Total investments at fair value 103,000 [3],[12]     107,000 [6],[13]            
Investment, Identifier [Axis]: Safety Products Holdings, LLC, Non-durable Consumer Goods, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 5,501,000 [1],[3],[10]     5,509,000 [6],[8],[11]            
Total investments at fair value 5,493,000 [1],[3],[10]     5,444,000 [6],[8],[11]            
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Acquisition Capex Facility                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 0     16,000            
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Healthcare & Pharmaceuticals First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost [5],[6],[8],[42]       1,096,000            
Total investments at fair value [5],[6],[8],[42]       1,167,000            
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Healthcare & Pharmaceuticals First Lien Senior Secured Term Loan 3                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[2],[3],[41] 450,000                  
Total investments at fair value [1],[2],[3],[41] 452,000                  
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [5],[6],[7],[8],[18]       2,308,000            
Total investments at fair value [5],[6],[7],[8],[18]       2,392,000            
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[2],[3],[41] 647,000                  
Total investments at fair value [1],[2],[3],[41] 657,000                  
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[2],[3],[4] 2,310,000                  
Total investments at fair value [1],[2],[3],[4] 2,371,000                  
Investment, Identifier [Axis]: Scaled Agile, Inc., Research & Consulting Services Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 52,000 [1],[3],[9],[10]     52,000 [6],[8],[11],[18]            
Total investments at fair value 43,000 [1],[3],[9],[10]     48,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Scaled Agile, Inc., Research & Consulting Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,775,000 [1],[3],[10]     1,776,000 [6],[8],[11]            
Total investments at fair value 1,727,000 [1],[3],[10]     1,759,000 [6],[8],[11]            
Investment, Identifier [Axis]: Scaled Agile, Inc., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 280,000     280,000            
Investment, Identifier [Axis]: Scout Bidco B.V., Diversified Manufacturing Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 202,000 [1],[2],[3],[4],[9]     202,000 [5],[6],[7],[8],[18]            
Total investments at fair value 198,000 [1],[2],[3],[4],[9]     205,000 [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: Scout Bidco B.V., Diversified Manufacturing, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,813,000 [1],[2],[3],[4]     3,810,000 [5],[6],[7],[8]            
Total investments at fair value 3,847,000 [1],[2],[3],[4]     3,957,000 [5],[6],[7],[8]            
Investment, Identifier [Axis]: Scout Bidco B.V., Diversified Manufacturing, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost 508,000 [1],[2],[3],[10]     508,000 [5],[6],[8],[11]            
Total investments at fair value 498,000 [1],[2],[3],[10]     501,000 [5],[6],[8],[11]            
Investment, Identifier [Axis]: Scout Bidco B.V., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 313,000     320,000            
Investment, Identifier [Axis]: Sereni Capital NV, Consumer Cyclical, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,483,000 [1],[2],[3],[23]     2,480,000 [5],[6],[8],[24]            
Total investments at fair value 2,490,000 [1],[2],[3],[23]     2,522,000 [5],[6],[8],[24]            
Investment, Identifier [Axis]: Serta Simmons Bedding LLC, Home Furnishings, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost [12] 893,000                  
Total investments at fair value [12] 373,000                  
Investment, Identifier [Axis]: Serta Simmons Bedding LLC, Home Furnishings, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [6],[13]       893,000            
Total investments at fair value [6],[13]       433,000            
Investment, Identifier [Axis]: Shelf Bidco Ltd, Other Financial Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 600,000 [2],[3],[12]     600,000 [5],[6],[13]            
Total investments at fair value 1,338,000 [2],[3],[12]     774,000 [5],[6],[13]            
Investment, Identifier [Axis]: Shelf Bidco Ltd, Other Financial, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 16,845,000 [1],[2],[3],[10]     16,873,000 [5],[6],[8],[11]            
Total investments at fair value 17,659,000 [1],[2],[3],[10]     17,009,000 [5],[6],[8],[11]            
Investment, Identifier [Axis]: Sinari Invest, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 604,000     617,000            
Investment, Identifier [Axis]: Sinari Invest, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,806,000 [1],[2],[3],[9],[23]     1,804,000 [5],[6],[8],[18],[24]            
Total investments at fair value 1,786,000 [1],[2],[3],[9],[23]     1,822,000 [5],[6],[8],[18],[24]            
Investment, Identifier [Axis]: SmartShift Group, Inc, Technology, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 183,000 [3],[12]     183,000 [6],[13]            
Total investments at fair value 261,000 [3],[12]     192,000 [6],[13]            
Investment, Identifier [Axis]: SmartShift Group, Inc, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 6,205,000 [1],[3],[9],[10]     6,222,000 [6],[8],[11],[18]            
Total investments at fair value 6,477,000 [1],[3],[9],[10]     6,222,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: SmartShift Group, Inc, Technology, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (25,000) [1],[3],[9],[10]     (26,000) [6],[8],[11],[18]            
Total investments at fair value 0 [1],[3],[9],[10]     (25,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: SmartShift Group, Inc., Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 2,294,000     2,294,000            
Investment, Identifier [Axis]: SmartShift Group, Inc., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,101,000     1,101,000            
Investment, Identifier [Axis]: Smartling, Inc., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 588,000     588,000            
Investment, Identifier [Axis]: Smartling, Inc., Technology Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (7,000) [1],[3],[9],[14]     (8,000) [6],[8],[15],[18]            
Total investments at fair value (2,000) [1],[3],[9],[14]     (6,000) [6],[8],[15],[18]            
Investment, Identifier [Axis]: Smartling, Inc., Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 9,096,000 [1],[3],[14]     9,134,000 [6],[8],[15]            
Total investments at fair value 9,179,000 [1],[3],[14]     9,169,000 [6],[8],[15]            
Investment, Identifier [Axis]: Soho Square III Debtco II SARL, Diversified Capital Markets, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 5,165,000 [2],[3]     5,094,000 [5],[6]            
Total investments at fair value $ 5,476,000 [2],[3]     $ 5,450,000 [5],[6]            
Investment, interest rate, paid in kind 9.50% [2],[3]     9.50% [5],[6]            
Investment, Identifier [Axis]: Solo Buyer, L.P., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing $ 798,000     $ 798,000            
Investment, Identifier [Axis]: Solo Buyer, L.P., Technology Partnership Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 310,000 [3],[12]     310,000 [6],[13]            
Total investments at fair value 310,000 [3],[12]     229,000 [6],[13]            
Investment, Identifier [Axis]: Solo Buyer, L.P., Technology Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 376,000 [1],[3],[9],[10]     374,000 [6],[8],[11],[18]            
Total investments at fair value 399,000 [1],[3],[9],[10]     369,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Solo Buyer, L.P., Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 13,138,000 [1],[3],[10]     13,195,000 [6],[8],[11]            
Total investments at fair value 13,294,000 [1],[3],[10]     13,159,000 [6],[8],[11]            
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 399,000     399,000            
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Other Utility Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 37,000 [1],[3],[9],[10]     64,000 [6],[8],[11],[18]            
Total investments at fair value 35,000 [1],[3],[9],[10]     62,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Other Utility, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [6],[8],[11],[18]       1,880,000            
Total investments at fair value [6],[8],[11],[18]       1,858,000            
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Other Utility, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[9],[10] 1,626,000                  
Total investments at fair value [1],[3],[9],[10] 1,612,000                  
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Other Utility, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] 253,000                  
Total investments at fair value [1],[3],[10] 246,000                  
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 117,000     90,000            
Investment, Identifier [Axis]: Spatial Business Systems LLC, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 938,000     937,000            
Investment, Identifier [Axis]: Spatial Business Systems LLC, Electric Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (13,000) [1],[3],[9],[14]     (14,000) [6],[8],[15],[18]            
Total investments at fair value (9,000) [1],[3],[9],[14]     (10,000) [6],[8],[15],[18]            
Investment, Identifier [Axis]: Spatial Business Systems LLC, Electric, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 5,684,000 [1],[3],[9],[14]     5,692,000 [6],[8],[15],[18]            
Total investments at fair value 5,730,000 [1],[3],[9],[14]     5,731,000 [6],[8],[15],[18]            
Investment, Identifier [Axis]: Spatial Business Systems LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 703,000     703,000            
Investment, Identifier [Axis]: Starnmeer B.V., Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,597,000 [1],[2],[3],[19]     4,594,000 [5],[6],[8],[20]            
Total investments at fair value 4,630,000 [1],[2],[3],[19]     4,621,000 [5],[6],[8],[20]            
Investment, Identifier [Axis]: Superjet Buyer, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,095,000     1,095,000            
Investment, Identifier [Axis]: Superjet Buyer, LLC, Technology Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 347,000 [1],[3],[9],[10]     345,000 [6],[8],[11],[18]            
Total investments at fair value 358,000 [1],[3],[9],[10]     355,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Superjet Buyer, LLC, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 15,939,000 [1],[3],[10]     15,967,000 [6],[8],[11]            
Total investments at fair value 16,077,000 [1],[3],[10]     16,091,000 [6],[8],[11]            
Investment, Identifier [Axis]: Syniverse Holdings, Inc., Technology Distributors, Series A Preferred Equity                    
Schedule of Equity Method Investments [Line Items]                    
Cost 8,989,000 [3]     8,989,000 [6]            
Total investments at fair value $ 9,015,000 [3]     $ 8,788,000 [6]            
Investment, interest rate, paid in kind 12.50% [3]     12.50% [6]            
Investment, Identifier [Axis]: Syntax Systems Ltd, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing $ 167,000     $ 231,000            
Investment, Identifier [Axis]: Syntax Systems Ltd, Technology Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 427,000 [1],[2],[3],[9],[14]     363,000 [5],[6],[8],[15],[18]            
Total investments at fair value 430,000 [1],[2],[3],[9],[14]     366,000 [5],[6],[8],[15],[18]            
Investment, Identifier [Axis]: Syntax Systems Ltd, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,036,000 [1],[2],[3],[14]     4,045,000 [5],[6],[8],[15]            
Total investments at fair value 4,064,000 [1],[2],[3],[14]     4,074,000 [5],[6],[8],[15]            
Investment, Identifier [Axis]: TA SL Cayman Aggregator Corp., Technology Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 23,000 [3],[12]     23,000 [6],[13]            
Total investments at fair value 35,000 [3],[12]     34,000 [6],[13]            
Investment, Identifier [Axis]: TA SL Cayman Aggregator Corp., Technology, Subordinated Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,200,000 [3]     1,122,000 [6]            
Total investments at fair value $ 1,186,000 [3]     $ 1,110,000 [6]            
Investment, interest rate, paid in kind 7.80% [3]     7.80% [6]            
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing $ 912,000     $ 1,469,000            
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 177,000     177,000            
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology Partnership Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost [3],[12] 5,000                  
Total investments at fair value [3],[12] 9,000                  
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology Partnership Units (4,673 units)                    
Schedule of Equity Method Investments [Line Items]                    
Cost [6],[13]       5,000            
Total investments at fair value [6],[13]       9,000            
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (3,000) [1],[3],[9],[10]     (3,000) [6],[8],[11],[18]            
Total investments at fair value (2,000) [1],[3],[9],[10]     (3,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,362,000 [1],[3],[9],[10]     805,000 [6],[8],[11],[18]            
Total investments at fair value 1,367,000 [1],[3],[9],[10]     810,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Tank Holding Corp, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 339,000     409,000            
Investment, Identifier [Axis]: Tank Holding Corp, Metal & Glass Containers Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 154,000 [1],[3],[9],[14]     164,000 [6],[8],[15],[18]            
Total investments at fair value 159,000 [1],[3],[9],[14]     167,000 [6],[8],[15],[18]            
Investment, Identifier [Axis]: Tank Holding Corp, Metal & Glass Containers, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,100,000 [1],[3],[14]     7,130,000 [6],[8],[15]            
Total investments at fair value 7,163,000 [1],[3],[14]     7,174,000 [6],[8],[15]            
Investment, Identifier [Axis]: Tank Holding Corp, Metal & Glass Containers, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,648,000 [1],[3],[9],[14]     1,584,000 [6],[8],[15],[18]            
Total investments at fair value 1,668,000 [1],[3],[9],[14]     1,620,000 [6],[8],[15],[18]            
Investment, Identifier [Axis]: Tank Holding Corp, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 491,000     480,000            
Investment, Identifier [Axis]: Tanqueray Bidco Limited, Capex Facility                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,143,000     1,153,000            
Investment, Identifier [Axis]: Tanqueray Bidco Limited, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [5],[6],[8],[18],[26]       1,502,000            
Total investments at fair value [5],[6],[8],[18],[26]       1,730,000            
Investment, Identifier [Axis]: Tanqueray Bidco Limited, Technology, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[2],[3],[9],[25] (14,000)                  
Total investments at fair value [1],[2],[3],[9],[25] 0                  
Investment, Identifier [Axis]: Tanqueray Bidco Limited, Technology, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[2],[3],[25] 1,520,000                  
Total investments at fair value [1],[2],[3],[25] 1,714,000                  
Investment, Identifier [Axis]: Team Air Distributing, LLC, Consumer Cyclical, Partnership Equity                    
Schedule of Equity Method Investments [Line Items]                    
Cost 400,000 [3],[12]     400,000 [6],[13]            
Total investments at fair value 424,000 [3],[12]     420,000 [6],[13]            
Investment, Identifier [Axis]: Team Air Distributing, LLC, Consumer Cyclical, Subordinated Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 589,000 [3]     589,000 [6]            
Total investments at fair value 591,000 [3]     590,000 [6]            
Investment, Identifier [Axis]: Techone B.V., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 154,000     94,000            
Investment, Identifier [Axis]: Techone B.V., Technology Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (8,000) [1],[2],[3],[4],[9]     57,000 [5],[6],[7],[8],[18]            
Total investments at fair value (2,000) [1],[2],[3],[4],[9]     60,000 [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: Techone B.V., Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,997,000 [1],[2],[3],[4]     2,994,000 [5],[6],[7],[8]            
Total investments at fair value 2,896,000 [1],[2],[3],[4]     2,955,000 [5],[6],[7],[8]            
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (8,000) [1],[3],[9],[10]     (9,000) [6],[8],[11],[18]            
Total investments at fair value (11,000) [1],[3],[9],[10]     (4,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,107,000 [1],[3],[10]     4,124,000 [6],[8],[11]            
Total investments at fair value 4,093,000 [1],[3],[10]     4,151,000 [6],[8],[11]            
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 752,000     752,000            
Investment, Identifier [Axis]: Terrybear, Inc., Consumer Products Partnership Equity                    
Schedule of Equity Method Investments [Line Items]                    
Cost 239,000 [3],[12]     239,000 [6],[13]            
Total investments at fair value 104,000 [3],[12]     115,000 [6],[13]            
Investment, Identifier [Axis]: Terrybear, Inc., Consumer Products, Subordinated Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 273,000 [3]     270,000 [6]            
Total investments at fair value $ 261,000 [3]     $ 260,000 [6]            
Investment, interest rate, paid in kind 4.00% [3]     4.00% [6]            
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Brokerage, Asset Managers & Exchanges Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ (9,000) [1],[3],[9],[10]     $ (9,000) [6],[8],[11],[18]            
Total investments at fair value 0 [1],[3],[9],[10]     0 [6],[8],[11],[18]            
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Brokerage, Asset Managers & Exchanges Subordinated Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,418,000 [1],[3],[19]     3,416,000 [6],[8],[20]            
Total investments at fair value 3,451,000 [1],[3],[19]     3,445,000 [6],[8],[20]            
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Brokerage, Asset Managers & Exchanges, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,524,000 [1],[3],[10]     766,000 [6],[8],[11],[18]            
Total investments at fair value 2,555,000 [1],[3],[10]     799,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 0     1,758,000            
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 796,000     796,000            
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Industrial Equipment Subordinated Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,510,000 [3]     2,431,000 [6]            
Total investments at fair value $ 2,532,000 [3]     $ 2,441,000 [6]            
Investment, interest rate, paid in kind 12.50% [3]     12.50% [6]            
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Industrial Equipment, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 11,879,000 [1],[3],[14]     $ 11,871,000 [6],[8],[15]            
Total investments at fair value 12,065,000 [1],[3],[14]     12,065,000 [6],[8],[15]            
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Industrial Equipment, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (23,000) [1],[3],[9],[14]     (25,000) [6],[8],[15],[18]            
Total investments at fair value 0 [1],[3],[9],[14]     0 [6],[8],[15],[18]            
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,615,000     1,615,000            
Investment, Identifier [Axis]: The Octave Music Group, Inc., Media: Diversified & Production Partnership Equity                    
Schedule of Equity Method Investments [Line Items]                    
Cost 409,000 [3],[12]     409,000 [6],[13]            
Total investments at fair value 1,301,000 [3],[12]     1,301,000 [6],[13]            
Investment, Identifier [Axis]: The Octave Music Group, Inc., Media: Diversified & Production, Second Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,543,000 [1],[3],[10]     2,542,000 [6],[8],[11]            
Total investments at fair value 2,585,000 [1],[3],[10]     2,563,000 [6],[8],[11]            
Investment, Identifier [Axis]: Thompson Rivers LLC                    
Schedule of Equity Method Investments [Line Items]                    
Total contributed capital                   $ 30,000,000
Investment, Identifier [Axis]: Thompson Rivers LLC, Member Interest                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value 4,503,000     5,523,000   12,537,000        
Investment, Identifier [Axis]: Thompson Rivers LLC, Investment Funds & Vehicles, 6.6% Member Interest                    
Schedule of Equity Method Investments [Line Items]                    
Cost 10,451,000 [12]     11,441,000 [13]            
Total investments at fair value 4,503,000 [12]     5,523,000 [13]            
Investment, Identifier [Axis]: Thompsonn Rivers LLC                    
Schedule of Equity Method Investments [Line Items]                    
Total contributed capital 32,318,000     32,318,000            
Total unused commitments to extend financing 0     0            
Investment, Identifier [Axis]: Trader Corporation, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 173,000     177,000            
Investment, Identifier [Axis]: Trader Corporation, Technology Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (3,000) [1],[2],[3],[9],[47]     (4,000) [5],[6],[8],[18],[48]            
Total investments at fair value 0 [1],[2],[3],[9],[47]     (3,000) [5],[6],[8],[18],[48]            
Investment, Identifier [Axis]: Trader Corporation, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,210,000 [1],[2],[3],[47]     2,214,000 [5],[6],[8],[48]            
Total investments at fair value 2,280,000 [1],[2],[3],[47]     2,309,000 [5],[6],[8],[48]            
Investment, Identifier [Axis]: Trident Maritime Systems, Inc., Aerospace & Defense, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 17,529,000 [1],[3],[10]     17,553,000 [6],[8],[11]            
Total investments at fair value 17,072,000 [1],[3],[10]     17,315,000 [6],[8],[11]            
Investment, Identifier [Axis]: Trintech, Inc., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 255,000     255,000            
Investment, Identifier [Axis]: Trintech, Inc., Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,504,000 [1],[3],[14]     4,511,000 [6],[8],[15]            
Total investments at fair value 4,524,000 [1],[3],[14]     4,527,000 [6],[8],[15]            
Investment, Identifier [Axis]: Trintech, Inc., Technology, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 92,000 [1],[3],[9],[14]     92,000 [6],[8],[15],[18]            
Total investments at fair value 94,000 [1],[3],[9],[14]     93,000 [6],[8],[15],[18]            
Investment, Identifier [Axis]: Turbo Buyer, Inc., Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 0     974,000            
Investment, Identifier [Axis]: Turbo Buyer, Inc., Finance Companies, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,982,000 [1],[3],[9],[10]     7,982,000 [6],[8],[11],[18]            
Total investments at fair value 7,764,000 [1],[3],[9],[10]     7,784,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Turnberry Solutions, Inc., Consumer Cyclical, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,757,000 [1],[3],[10]     7,789,000 [6],[8],[11]            
Total investments at fair value 7,837,000 [1],[3],[10]     7,815,000 [6],[8],[11]            
Investment, Identifier [Axis]: UBC Ledgers Holding AB, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 792,000     840,000            
Investment, Identifier [Axis]: UBC Ledgers Holding AB, Financial Other Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 0 [1],[2],[3],[9],[49]     0 [5],[6],[8],[18],[50]            
Total investments at fair value 0 [1],[2],[3],[9],[49]     0 [5],[6],[8],[18],[50]            
Investment, Identifier [Axis]: UBC Ledgers Holding AB, Financial Other,First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,469,000 [1],[2],[3],[9],[49]     1,467,000 [5],[6],[8],[18],[50]            
Total investments at fair value 1,447,000 [1],[2],[3],[9],[49]     1,529,000 [5],[6],[8],[18],[50]            
Investment, Identifier [Axis]: UBC Ledgers Holding AB, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 262,000     278,000            
Investment, Identifier [Axis]: UKFast Leaders Limited, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,084,000 [1],[2],[3],[25]     1,092,000 [5],[6],[8],[26]            
Total investments at fair value 992,000 [1],[2],[3],[25]     $ 995,000 [5],[6],[8],[26]            
Investment, interest rate, paid in kind [5],[6],[8],[26]       3.40%            
Investment, Identifier [Axis]: Union Bidco Limited, Acquisition Facility                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 82,000     $ 83,000            
Investment, Identifier [Axis]: Union Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 874,000 [1],[2],[3],[9],[25]     873,000 [5],[6],[8],[18],[26]            
Total investments at fair value 888,000 [1],[2],[3],[9],[25]     877,000 [5],[6],[8],[18],[26]            
Investment, Identifier [Axis]: United Therapy Holding III GmbH, Acquisition Facility                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 668,000     683,000            
Investment, Identifier [Axis]: United Therapy Holding III GmbH, Healthcare, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,707,000 [1],[2],[3],[9],[23]     1,705,000 [5],[6],[8],[18],[24]            
Total investments at fair value 1,305,000 [1],[2],[3],[9],[23]     1,312,000 [5],[6],[8],[18],[24]            
Investment, Identifier [Axis]: Unither (Uniholding), Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 468,000     479,000            
Investment, Identifier [Axis]: Unither (Uniholding), Pharma-ceuticals, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,959,000 [1],[2],[3],[4],[9]     1,956,000 [5],[6],[7],[8],[18]            
Total investments at fair value 2,017,000 [1],[2],[3],[4],[9]     2,037,000 [5],[6],[7],[8],[18]            
Investment, Identifier [Axis]: Utac Ceram, Business Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 842,000 [1],[2],[3],[4]     839,000 [5],[6],[7],[8]            
Total investments at fair value $ 724,000 [1],[2],[3],[4]     $ 739,000 [5],[6],[7],[8]            
Investment, interest rate, paid in kind 1.80% [1],[2],[3],[4]     1.80% [5],[6],[7],[8]            
Investment, Identifier [Axis]: Utac Ceram, Business Services, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 370,000 [1],[2],[3],[10]     $ 364,000 [5],[6],[8],[11]            
Total investments at fair value $ 348,000 [1],[2],[3],[10]     $ 342,000 [5],[6],[8],[11]            
Investment, interest rate, paid in kind 1.80% [1],[2],[3],[10]     1.80% [5],[6],[8],[11]            
Investment, Identifier [Axis]: Victoria Bidco Limited, Industrial Machinery, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 8,441,000 [1],[2],[3],[25]     $ 8,433,000 [5],[6],[8],[26]            
Total investments at fair value 7,280,000 [1],[2],[3],[25]     7,396,000 [5],[6],[8],[26]            
Investment, Identifier [Axis]: VistaJet Pass Through Trust 2021-1B, Airlines, Structured Secured Note - Class B                    
Schedule of Equity Method Investments [Line Items]                    
Cost 7,143,000 [3]     7,857,000 [6]            
Total investments at fair value 7,011,000 [3]     6,524,000 [6]            
Investment, Identifier [Axis]: Vital Buyer, LLC, Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 12,004,000 [1],[3],[10]     12,123,000 [6],[8],[11]            
Total investments at fair value 12,163,000 [1],[3],[10]     12,292,000 [6],[8],[11]            
Investment, Identifier [Axis]: Vital Buyer, LLC, Technology, Partnership Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 165,000 [3],[12]     164,000 [6],[13]            
Total investments at fair value 279,000 [3],[12]     434,000 [6],[13]            
Investment, Identifier [Axis]: W2O Holdings, Inc., Delayed Draw Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 0     234,000            
Investment, Identifier [Axis]: W2O Holdings, Inc., Healthcare Technology, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,370,000 [3],[10]     2,382,000 [6],[11]            
Total investments at fair value 2,326,000 [3],[10]     2,338,000 [6],[11]            
Investment, Identifier [Axis]: W2O Holdings, Inc., Healthcare Technology, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,258,000 [3],[9],[19]     1,020,000 [6],[18],[20]            
Total investments at fair value 1,253,000 [3],[9],[19]     1,021,000 [6],[18],[20]            
Investment, Identifier [Axis]: WEST-NR ACQUISITIONCO, LLC, Insurance, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [6],[8],[11],[18]       1,201,000            
Total investments at fair value [6],[8],[11],[18]       1,201,000            
Investment, Identifier [Axis]: WEST-NR ACQUISITIONCO, LLC, Insurance, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] 1,222,000                  
Total investments at fair value [1],[3],[10] 1,244,000                  
Investment, Identifier [Axis]: WEST-NR ACQUISITIONCO, LLC, Insurance, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[9],[10] (21,000)                  
Total investments at fair value [1],[3],[9],[10] 0                  
Investment, Identifier [Axis]: WWEC Holdings III Corp, Capital Goods, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [6],[8],[11]       6,374,000            
Total investments at fair value [6],[8],[11]       6,501,000            
Investment, Identifier [Axis]: WWEC Holdings III Corp, Capital Goods, First Lien Senior Secured Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] 1,153,000                  
Total investments at fair value [1],[3],[10] 1,131,000                  
Investment, Identifier [Axis]: WWEC Holdings III Corp, Capital Goods, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[10] 5,210,000                  
Total investments at fair value [1],[3],[10] 5,190,000                  
Investment, Identifier [Axis]: WWEC Holdings III Corp, Capital Goods, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost (16,000) [1],[3],[9],[10]     157,000 [6],[8],[11],[18]            
Total investments at fair value (23,000) [1],[3],[9],[10]     175,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: WWEC Holdings III Corp, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 932,000     757,000            
Investment, Identifier [Axis]: Waccamaw River LLC                    
Schedule of Equity Method Investments [Line Items]                    
Total contributed capital 26,730,000     26,730,000         $ 25,000,000  
Total return of capital (recallable)                 $ 1,700,000  
Total unused commitments to extend financing 0     0            
Investment, Identifier [Axis]: Waccamaw River LLC, Member Interest                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value 15,655,000     15,470,000   $ 20,212,000        
Investment, Identifier [Axis]: Waccamaw River LLC, Investment Funds & Vehicles, 20% Member Interest                    
Schedule of Equity Method Investments [Line Items]                    
Cost 25,036,000 [2],[12]     25,036,000 [5],[13]            
Total investments at fair value 15,655,000 [2],[12]     15,470,000 [5],[13]            
Investment, Identifier [Axis]: West-NR AcquisitionCo., LLC, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,250,000     1,250,000            
Investment, Identifier [Axis]: Wheels Up Experience Inc, Transportation Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 6,201,000 [3]     6,911,000 [6]            
Total investments at fair value 5,923,000 [3]     6,590,000 [6]            
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 6,074,000 [1],[3],[10]     6,066,000 [6],[8],[11]            
Total investments at fair value 6,279,000 [1],[3],[10]     6,096,000 [6],[8],[11]            
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, LP Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 315,000 [3],[12]     315,000 [6],[13]            
Total investments at fair value 409,000 [3],[12]     402,000 [6],[13]            
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 422,000 [1],[3],[9],[10]     31,000 [6],[8],[11],[18]            
Total investments at fair value 451,000 [1],[3],[9],[10]     34,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 490,000     880,000            
Investment, Identifier [Axis]: White Bidco Limited, Delayed Draw Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 257,000     257,000            
Investment, Identifier [Axis]: White Bidco Limited, Technology,First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 845,000 [1],[2],[3],[9],[10]     844,000 [5],[6],[8],[11],[18]            
Total investments at fair value 848,000 [1],[2],[3],[9],[10]     843,000 [5],[6],[8],[11],[18]            
Investment, Identifier [Axis]: Willis Engine Structured Trust VI, Structured Finance, Structured Secured Note - Series 2021-1 Class C                    
Schedule of Equity Method Investments [Line Items]                    
Cost 1,729,000 [3]     1,814,000 [6]            
Total investments at fair value 1,564,000 [3]     1,475,000 [6]            
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 777,000 [3],[12]     777,000 [6],[13]            
Total investments at fair value 495,000 [3],[12]     473,000 [6],[13]            
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,259,000 [1],[3],[10]     3,256,000 [6],[8],[11]            
Total investments at fair value 3,101,000 [1],[3],[10]     3,031,000 [6],[8],[11]            
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 877,000 [1],[3],[9],[10]     715,000 [6],[8],[11],[18]            
Total investments at fair value 827,000 [1],[3],[9],[10]     644,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: Woodland Foods, LLC, Line of Credit                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 157,000     318,000            
Investment, Identifier [Axis]: World 50, Inc., Professional Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[3],[9],[10] 4,657,000                  
Total investments at fair value [1],[3],[9],[10] 4,657,000                  
Investment, Identifier [Axis]: World 50, Inc., Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 243,000     0            
Investment, Identifier [Axis]: Xeinadin Bidco Limited, CAF Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 1,601,000     2,062,000            
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Financial Other, Common Stock                    
Schedule of Equity Method Investments [Line Items]                    
Cost 226,000 [2],[3],[12]     226,000 [5],[6],[13]            
Total investments at fair value 231,000 [2],[3],[12]     233,000 [5],[6],[13]            
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Financial Other, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 233,000 [1],[2],[3],[4]     5,821,000 [5],[6],[8],[18],[26]            
Total investments at fair value 228,000 [1],[2],[3],[4]     6,024,000 [5],[6],[8],[18],[26]            
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Financial Other, First Lien Senior Secured Term Loan 2                    
Schedule of Equity Method Investments [Line Items]                    
Cost [1],[2],[3],[9],[25] 6,043,000                  
Total investments at fair value [1],[2],[3],[9],[25] 6,201,000                  
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Financial Other, Subordinated Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 2,381,000 [2],[3]     2,193,000 [5],[6]            
Total investments at fair value $ 2,444,000 [2],[3]     $ 2,276,000 [5],[6]            
Investment, interest rate, paid in kind 11.00% [2],[3]     11.00% [5],[6]            
Investment, Identifier [Axis]: ZB Holdco LLC, Delayed Draw Term Loan 1                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing $ 381,000     $ 1,466,000            
Investment, Identifier [Axis]: ZB Holdco LLC, Food & Beverage, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 4,167,000 [1],[3],[9],[10]     3,093,000 [6],[8],[11],[18]            
Total investments at fair value 4,154,000 [1],[3],[9],[10]     3,135,000 [6],[8],[11],[18]            
Investment, Identifier [Axis]: ZB Holdco LLC, Food & Beverage, LLC Units                    
Schedule of Equity Method Investments [Line Items]                    
Cost 76,000 [3]     76,000 [6]            
Total investments at fair value 106,000 [3]     86,000 [6]            
Investment, Identifier [Axis]: ZB Holdco LLC, Food & Beverage, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 147,000 [1],[3],[9],[10]     (6,000) [6],[8],[11],[18]            
Total investments at fair value 144,000 [1],[3],[9],[10]     (3,000) [6],[8],[11],[18]            
Investment, Identifier [Axis]: ZB Holdco LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 271,000     423,000            
Investment, Identifier [Axis]: Zeppelin Bidco Limited, Capex / Acquisition Facility                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 0     1,333,000            
Investment, Identifier [Axis]: Zeppelin Bidco Limited, Services: Business, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 3,118,000 [1],[2],[3],[9],[25]     3,098,000 [5],[6],[8],[18],[26]            
Total investments at fair value 2,778,000 [1],[2],[3],[9],[25]     2,859,000 [5],[6],[8],[18],[26]            
Investment, Identifier [Axis]: eShipping, LLC, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Total unused commitments to extend financing 917,000     1,122,000            
Investment, Identifier [Axis]: eShipping, LLC, Transportation Services, First Lien Senior Secured Term Loan                    
Schedule of Equity Method Investments [Line Items]                    
Cost 6,597,000 [1],[3],[14]     6,595,000 [6],[8],[15]            
Total investments at fair value 6,684,000 [1],[3],[14]     6,686,000 [6],[8],[15]            
Investment, Identifier [Axis]: eShipping, LLC, Transportation Services, Revolver                    
Schedule of Equity Method Investments [Line Items]                    
Cost 191,000 [1],[3],[9],[14]     (14,000) [6],[8],[15],[18]            
Total investments at fair value $ 204,000 [1],[3],[9],[14]     $ 0 [6],[8],[15],[18]            
Banff Partners LP                    
Schedule of Equity Method Investments [Line Items]                    
Ownership percent 10.00% [2],[12],[51],[52],[53]     10.00% [5],[13],[54],[55],[56]            
Rocade Holdings LLC                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value         $ 45,000,000          
Rocade Holdings LLC | Minimum                    
Schedule of Equity Method Investments [Line Items]                    
Investment, interest rate, paid in kind         10.00%          
Rocade Holdings LLC | Maximum                    
Schedule of Equity Method Investments [Line Items]                    
Investment, interest rate, paid in kind         25.00%          
Single Portfolio Company | Investment Owned, At Fair Value | Portfolio Company Investment Risk                    
Schedule of Equity Method Investments [Line Items]                    
Percentage of Total Portfolio 5.60%     5.70%            
New Investments                    
Schedule of Equity Method Investments [Line Items]                    
Number of investments entered into | investment 10 10                
Purchases of portfolio investments $ 27,500,000 $ 36,700,000                
Existing Portfolio                    
Schedule of Equity Method Investments [Line Items]                    
Purchases of portfolio investments 23,700,000 19,800,000                
Investments in joint ventures                    
Schedule of Equity Method Investments [Line Items]                    
Cost 50,132,000     $ 51,123,000            
Total investments at fair value 36,725,000     37,212,000            
Equity Co-Investments                    
Schedule of Equity Method Investments [Line Items]                    
Purchases of portfolio investments   45,000,000                
Ginnie Mae Early Buyout Loans | Thompson Rivers LLC                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value 307,700,000     366,700,000            
Cash and Cash Equivalents | Thompson Rivers LLC                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value 7,700,000     7,100,000            
Cash and Cash Equivalents | Waccamaw River, LLC                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value 7,200,000     6,600,000            
Consumer Loan | Waccamaw River, LLC                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value 154,900,000     182,300,000            
Unfunded Securities | Eclipse Business Capital Holdings LLC                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value             $ 11,200,000 $ 6,700,000    
Funded Securities | Eclipse Business Capital Holdings LLC                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value 2,900,000     2,700,000            
Revolving Line Of Credit | Eclipse Business Capital Holdings LLC | Minimum                    
Schedule of Equity Method Investments [Line Items]                    
Investment owned, face amount 10,000,000                  
Revolving Line Of Credit | Eclipse Business Capital Holdings LLC | Maximum                    
Schedule of Equity Method Investments [Line Items]                    
Investment owned, face amount 125,000,000                  
Equity shares                    
Schedule of Equity Method Investments [Line Items]                    
Cost 176,427,000     162,731,000            
Total investments at fair value 207,185,000     192,641,000            
Equity shares | Level 3                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value 193,533,000     192,563,000            
Equity shares | Yield Analysis | Market Approach                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value $ 7,100,000     $ 2,600,000            
Number of investments | investment 1     1            
Senior debt and 1st lien notes                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 996,015,000     $ 1,000,294,000            
Total investments at fair value 982,334,000     985,158,000            
Senior debt and 1st lien notes | Level 3                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value 946,150,000     949,079,000            
Senior debt and 1st lien notes | Yield Analysis | Market Approach                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value $ 2,700,000     $ 7,100,000            
Number of investments | investment 1     4            
Senior debt and 1st lien notes | Banff Partners LP                    
Schedule of Equity Method Investments [Line Items]                    
Cost $ 146,901,000     $ 147,990,000            
Total investments at fair value 139,697,000     142,490,000            
Structured products                    
Schedule of Equity Method Investments [Line Items]                    
Cost 28,657,000     29,479,000            
Total investments at fair value 27,744,000     26,173,000            
Structured products | Level 3                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value 15,801,000     14,915,000            
Structured products | Discounted Cash Flow Analysis | Valuation, Broker Quote                    
Schedule of Equity Method Investments [Line Items]                    
Total investments at fair value       $ 6,500,000            
Number of investments | investment       1            
Investments With No Previous Contractual Commitment To Provide Financing                    
Schedule of Equity Method Investments [Line Items]                    
Purchases of portfolio investments 31,000,000 91,600,000                
Investment With Previous Commitment To Provide Financing                    
Schedule of Equity Method Investments [Line Items]                    
Purchases of portfolio investments $ 20,300,000 $ 9,800,000                
Investment Denominated In Australian Dollars                    
Schedule of Equity Method Investments [Line Items]                    
Number of investments | investment 12     12            
Investment Denominated In Canadian Dollars                    
Schedule of Equity Method Investments [Line Items]                    
Number of investments | investment 2     2            
Investment Denominated In Danish Kroner                    
Schedule of Equity Method Investments [Line Items]                    
Number of investments | investment 1     1            
Investment Denominated In New Zealand Dollars                    
Schedule of Equity Method Investments [Line Items]                    
Number of investments | investment 2     2            
Investment Denominated In Norwegian Krone                    
Schedule of Equity Method Investments [Line Items]                    
Number of investments | investment 1     1            
Investment Denominated In Euros                    
Schedule of Equity Method Investments [Line Items]                    
Number of investments | investment 60     58            
Investment Denominated In Swedish Krono                    
Schedule of Equity Method Investments [Line Items]                    
Number of investments | investment 1                  
Investment Denominated In Swiss Francs                    
Schedule of Equity Method Investments [Line Items]                    
Number of investments | investment 2     2            
Investment Denominated In British Pounds Sterling                    
Schedule of Equity Method Investments [Line Items]                    
Number of investments | investment 23     23            
[1] Debt investment includes interest rate floor feature.
[2] Investment is not a qualifying investment as defined under Section 55(a) of the 1940 Act. Non-qualifying assets represent 26.6% of total investments at fair value as of March 31, 2024. Qualifying assets must represent at least 70% of total assets at the time of acquisition of any additional non-qualifying assets. If at any time qualifying assets do not represent at least 70% of the Company’s total assets, the Company will be precluded from acquiring any additional non-qualifying asset until such time as it complies with the requirements of Section 55(a).
[3] The fair value of the investment was determined using significant unobservable inputs.
[4] The interest rate on these loans is subject to 3 Month EURIBOR, which as of March 31, 2024 was 3.89200%.
[5] Investment is not a qualifying investment as defined under Section 55(a) of the 1940 Act. Non-qualifying assets represent 26.9% of total investments at fair value as of December 31, 2023. Qualifying assets must represent at least 70% of total assets at the time of acquisition of any additional non-qualifying assets. If at any time qualifying assets do not represent at least 70% of the Company’s total assets, the Company will be precluded from acquiring any additional non-qualifying asset until such time as it complies with the requirements of Section 55(a).
[6] The fair value of the investment was determined using significant unobservable inputs.
[7] The interest rate on these loans is subject to 3 Month EURIBOR, which as of December 31, 2023 was 3.90900%.
[8] Debt investment includes interest rate floor feature.
[9] Position or portion thereof is an unfunded loan or equity commitment.
[10] The interest rate on these loans is subject to 3 Month SOFR, which as of March 31, 2024 was 5.29823%.
[11] The interest rate on these loans is subject to 3 Month SOFR, which as of December 31, 2023 was 5.33140%.
[12] Investment is non-income producing.
[13] Investment is non-income producing.
[14] The interest rate on these loans is subject to 1 Month SOFR, which as of March 31, 2024 was 5.32874%.
[15] The interest rate on these loans is subject to 1 Month SOFR, which as of December 31, 2023 was 5.35472%.
[16] The interest rate on these loans is subject to 1 Month BBSY, which as of March 31, 2024 was 4.29730%.
[17] The interest rate on these loans is subject to 1 Month BBSY, which as of December 31, 2023 was 4.31000%.
[18] Position or portion thereof is an unfunded loan or equity commitment.
[19] The interest rate on these loans is subject to 6 Month SOFR, which as of March 31, 2024 was 5.21781%.
[20] The interest rate on these loans is subject to 6 Month SOFR, which as of December 31, 2023 was 5.15772%.
[21] The interest rate on these loans is subject to 3 Month BBSY, which as of March 31, 2024 was 4.34420%.
[22] The interest rate on these loans is subject to 3 Month BBSY, which as of December 31, 2023 was 4.35750%.
[23] The interest rate on these loans is subject to 6 Month EURIBOR, which as of March 31, 2024 was 3.85100%.
[24] The interest rate on these loans is subject to 6 Month EURIBOR, which as of December 31, 2023 was 3.86100%.
[25] The interest rate on these loans is subject to 3 Month SONIA, which as of March 31, 2024 was 5.18440%.
[26] The interest rate on these loans is subject to 3 Month SONIA, which as of December 31, 2023 was 5.20530%.
[27] The interest rate on these loans is subject to 6 Month SONIA, which as of March 31, 2024 was 5.09150%.
[28] The interest rate on these loans is subject to 6 Month SONIA, which as of December 31, 2023 was 5.13220%.
[29] The interest rate on these loans is subject to 6 Month BBSY, which as of March 31, 2024 was 4.49860%.
[30] The interest rate on these loans is subject to 6 Month BBSY, which as of December 31, 2023 was 4.44500%.
[31] The interest rate on these loans is subject to 1 Month EURIBOR, which as of March 31, 2024 was 3.85500%.
[32] The interest rate on these loans is subject to 1 Month SONIA, which as of March 31, 2024 was 5.19800%.
[33] The interest rate on these loans is subject to 1 Month SONIA, which as of December 31, 2023 was 5.19920%.
[34] The interest rate on these loans is subject to 3 Month CDOR, which as of March 31, 2024 was 5.29500%.
[35] The interest rate on these loans is subject to 3 Month CDOR, which as of December 31, 2023 was 5.44750%.
[36] The fair value of the investment was determined using significant unobservable inputs.
[37] The fair value of the investment was determined using significant unobservable inputs.
[38] Non-accrual investment.
[39] Non-accrual investment.
[40] The interest rate on these loans is subject to 3 Month BKBM, which as of March 31, 2024 was 5.64000%.
[41] The interest rate on these loans is subject to 6 Month SARON, which as of March 31, 2024 was 1.46421%.
[42] The interest rate on these loans is subject to 6 Month SARON, which as of December 31, 2023 was 1.69524%.
[43] The interest rate on these loans is subject to 3 Month BKBM, which as of December 31, 2023 was 5.63000%.
[44] The interest rate on these loans is subject to 1 Month NIBOR, which as of March 31, 2024 was 4.61000%.
[45] The interest rate on these loans is subject to 1 Month NIBOR, which as of December 31, 2023 was 4.59000%.
[46] The interest rate on these loans is subject to 1 Month EURIBOR, which as of December 31, 2023 was 3.84500%.
[47] The interest rate on these loans is subject to 1Month CDOR, which as of March 31, 2024 was 5.29000%.
[48] The interest rate on these loans is subject to 1Month CDOR, which as of December 31, 2023 was 5.45500%.
[49] The interest rate on these loans is subject to 3 Month STIBOR, which as of March 31, 2024 was 4.02500%.
[50] The interest rate on these loans is subject to 3 Month STIBOR, which as of December 31, 2023 was 4.05200%.
[51] All debt investments are income producing, unless otherwise noted. Barings Capital Investment Corporation’s (the “Company”) external investment adviser, Barings LLC (“Barings” or the “Adviser”), determines in good faith the fair value of the Company’s investments in accordance with a valuation policy and processes established by the Adviser, which have been approved by the Company’s board of directors (the “Board”), and the Investment Company Act of 1940, as amended (the “1940 Act”). In addition, all debt investments are variable rate investments unless otherwise noted. Index-based floating interest rates are generally subject to a contractual minimum interest rate. Variable rate loans to the Company’s portfolio companies bear interest at a rate that may be determined by reference to the Secured Overnight Financing Rate (“SOFR”), the Euro Interbank Offered Rate (“EURIBOR”), the Bank Bill Swap Bid Rate (“BBSY”), the Stockholm Interbank Offered Rate (“STIBOR”), the Canadian Dollar
Offered Rate (“CDOR”), the Sterling Overnight Index Average (“SONIA”), the Swiss Average Rate Overnight (“SARON”), the Norwegian Interbank Offered Rate (“NIBOR”), the Bank Bill Market rate (“BKBM”) or an alternate base rate (commonly based on the Federal Funds Rate or the Prime Rate), at the borrower’s option, which reset annually, semi-annually, quarterly or monthly. For each such loan, the Company has provided the interest rate in effect on the date presented. SOFR-based contracts may include a credit spread adjustment that is charged in addition to the base rate and the stated spread. The borrower may also elect to have multiple interest reset periods for each loan.
[52] A summary of the composition of the Company’s investment portfolio at cost and fair value, and as a percentage of total investments and net assets are as follows:
[53] All of the Company’s portfolio company investments (including joint venture investments), which as of March 31, 2024 represented 203.4% of the Company’s net assets, are subject to legal restrictions on sales. The acquisition date represents the date of the Company’s initial investment in the relevant portfolio company.
[54] All debt investments are income producing, unless otherwise noted. The Adviser determines in good faith the fair value of the Company’s investments in accordance with a valuation policy and processes established by the Adviser, which have been approved by the Board, and the 1940 Act. In addition, all debt investments are variable rate investments unless otherwise noted. Index-based floating interest rates are generally subject to a contractual minimum interest rate. Variable rate loans to the Company’s portfolio companies bear interest at a rate that may be determined by reference to SOFR, EURIBOR, BBSY, STIBOR, CDOR, SONIA, SARON, NIBOR, BKBM or an alternate base rate (commonly based on the Federal Funds Rate or the Prime Rate), at the borrower’s option, which reset annually, semi-annually, quarterly or monthly. For each such loan, the Company has provided the interest rate in effect on the date presented. SOFR-based contracts may include a credit spread adjustment that is charged in addition to the base rate and the stated spread. The borrower may also elect to have multiple interest reset periods for each loan.
[55] A summary of the composition of the Company’s investment portfolio at cost and fair value, and as a percentage of total investments and net assets are as follows:
($ in thousands)CostPercent of
Total
Portfolio		Fair ValuePercent of
Total
Portfolio		Percent of
Total
Net Assets
December 31, 2023:
Senior debt and 1st lien notes
$1,000,294 74 %$985,158 73 %151 %
Subordinated debt and 2nd lien notes
108,487 8 106,894 8 16 
Structured products29,479 2 26,173 2 4 
Equity shares162,731 12 192,641 14 30 
Equity warrants2 — 1,043 — — 
Investments in joint ventures51,123 4 37,212 3 6 
$1,352,116 100 %$1,349,121 100 %207 %
[56] All of the Company’s portfolio company investments (including joint venture investments), which as of December 31, 2023 represented 206.9% of the Company’s net assets, are subject to legal restrictions on sales. The acquisition date represents the date of the Company’s initial investment in the relevant portfolio company.