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Unaudited Consolidated Schedule of Investments - Schedule of Investments by Industry (Parenthetical) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Fair Value $ 2,416,714 $ 2,488,715
Percentage of Total Net Assets 202.30% [1] 208.00% [2]
Aerospace and Defense    
Schedule of Investments [Line Items]    
Fair Value $ 110,084 $ 132,498
Percentage of Total Net Assets 9.20% 11.10%
Automotive    
Schedule of Investments [Line Items]    
Fair Value $ 52,532 $ 80,828
Percentage of Total Net Assets 4.40% 6.70%
Banking, Finance, Insurance and Real Estate    
Schedule of Investments [Line Items]    
Fair Value $ 404,997 $ 401,816
Percentage of Total Net Assets 34.00% 33.60%
Beverage, Food and Tobacco    
Schedule of Investments [Line Items]    
Fair Value $ 36,388 $ 23,135
Percentage of Total Net Assets 3.00% 1.90%
Capital Equipment    
Schedule of Investments [Line Items]    
Fair Value $ 112,786 $ 128,706
Percentage of Total Net Assets 9.40% 10.80%
Chemicals, Plastics, and Rubber    
Schedule of Investments [Line Items]    
Fair Value $ 38,852 $ 35,897
Percentage of Total Net Assets 3.30% 3.00%
Construction and Building    
Schedule of Investments [Line Items]    
Fair Value $ 27,933 $ 30,387
Percentage of Total Net Assets 2.30% 2.50%
Consumer goods: Durable    
Schedule of Investments [Line Items]    
Fair Value $ 38,378 $ 47,074
Percentage of Total Net Assets 3.20% 3.90%
Consumer goods: Non-durable    
Schedule of Investments [Line Items]    
Fair Value $ 44,231 $ 28,210
Percentage of Total Net Assets 3.70% 2.40%
Containers, Packaging and Glass    
Schedule of Investments [Line Items]    
Fair Value $ 37,033 $ 37,524
Percentage of Total Net Assets 3.10% 3.10%
Electrical Components & Equipment    
Schedule of Investments [Line Items]    
Fair Value $ 10,451 $ 0
Percentage of Total Net Assets 0.90% 0.00%
Energy: Electricity    
Schedule of Investments [Line Items]    
Fair Value $ 12,046 $ 20,874
Percentage of Total Net Assets 1.00% 1.70%
Energy: Oil and Gas    
Schedule of Investments [Line Items]    
Fair Value $ 2,857 $ 3,240
Percentage of Total Net Assets 0.20% 0.30%
Environmental Industries    
Schedule of Investments [Line Items]    
Fair Value   $ 53,484
Percentage of Total Net Assets   4.50%
Environmental Services    
Schedule of Investments [Line Items]    
Fair Value $ 51,828 $ 53,484
Percentage of Total Net Assets 4.30% 4.50%
Healthcare & Pharmaceuticals    
Schedule of Investments [Line Items]    
Fair Value $ 201,303 $ 216,952
Percentage of Total Net Assets 16.90% 18.10%
High Tech Industries    
Schedule of Investments [Line Items]    
Fair Value $ 251,487 $ 303,082
Percentage of Total Net Assets 21.10% 25.40%
Hotel, Gaming and Leisure    
Schedule of Investments [Line Items]    
Fair Value $ 56,771 $ 54,256
Percentage of Total Net Assets 4.80% 4.50%
Investment Funds and Vehicles    
Schedule of Investments [Line Items]    
Fair Value $ 104,243 $ 110,066
Percentage of Total Net Assets 8.70% 9.20%
Media: Advertising, Printing and Publishing    
Schedule of Investments [Line Items]    
Fair Value $ 42,754 $ 39,447
Percentage of Total Net Assets 3.60% 3.30%
Media: Broadcasting and Subscription    
Schedule of Investments [Line Items]    
Fair Value $ 12,437 $ 13,277
Percentage of Total Net Assets 1.00% 1.10%
Media: Diversified and Production    
Schedule of Investments [Line Items]    
Fair Value $ 64,084 $ 64,559
Percentage of Total Net Assets 5.30% 5.40%
Metals and Mining    
Schedule of Investments [Line Items]    
Fair Value $ 8,720 $ 8,993
Percentage of Total Net Assets 0.70% 0.80%
Services: Business    
Schedule of Investments [Line Items]    
Fair Value $ 404,614 $ 326,762
Percentage of Total Net Assets 33.90% 27.30%
Services: Consumer    
Schedule of Investments [Line Items]    
Fair Value $ 64,362 $ 61,409
Percentage of Total Net Assets 5.40% 5.10%
Structured products    
Schedule of Investments [Line Items]    
Fair Value $ 99,341 $ 102,922
Percentage of Total Net Assets 8.30% 8.60%
Telecommunications    
Schedule of Investments [Line Items]    
Fair Value $ 29,618 $ 27,565
Percentage of Total Net Assets 2.50% 2.30%
Transportation: Cargo    
Schedule of Investments [Line Items]    
Fair Value $ 82,114 $ 96,450
Percentage of Total Net Assets 6.90% 8.10%
Transportation: Consumer    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 11,951
Percentage of Total Net Assets 0.00% 1.00%
Utilities: Electric    
Schedule of Investments [Line Items]    
Fair Value $ 14,470 $ 22,696
Percentage of Total Net Assets 1.20% 1.90%
Utilities: Oil and Gas    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 4,655
Percentage of Total Net Assets 0.00% 0.40%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Aerospace and Defense    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.60% 5.30%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Automotive    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.20% 3.30%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Banking, Finance, Insurance and Real Estate    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 16.80% 16.10%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Beverage, Food and Tobacco    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.50% 0.90%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Capital Equipment    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.70% 5.20%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Chemicals, Plastics, and Rubber    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.60% 1.50%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Construction and Building    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.20% 1.20%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Consumer goods: Durable    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.60% 1.90%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Consumer goods: Non-durable    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.80% 1.10%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Containers, Packaging and Glass    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.50% 1.50%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Electrical Components & Equipment    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.40% 0.00%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Energy: Electricity    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.50% 0.80%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Energy: Oil and Gas    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.10% 0.10%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Environmental Industries    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio   2.10%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Environmental Services    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.10% 2.10%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Healthcare & Pharmaceuticals    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 8.30% 8.70%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | High Tech Industries    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 10.40% 12.20%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Hotel, Gaming and Leisure    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.30% 2.20%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Investment Funds and Vehicles    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.30% 4.40%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Media: Advertising, Printing and Publishing    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.80% 1.60%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Media: Broadcasting and Subscription    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.50% 0.50%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Media: Diversified and Production    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.70% 2.60%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Metals and Mining    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.40% 0.40%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Services: Business    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 16.70% 13.20%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Services: Consumer    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.70% 2.50%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Structured products    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.10% 4.10%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Telecommunications    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.20% 1.10%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Transportation: Cargo    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 3.40% 3.90%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Transportation: Consumer    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.50%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Utilities: Electric    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.60% 0.90%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Utilities: Oil and Gas    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.20%
[1] Fair value as a percentage of net assets.
[2] Fair value as a percentage of net assets.