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Unaudited Consolidated Schedule Of Investments - Schedule Of Investments by Industry (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Fair Value $ 2,527,537 $ 2,488,715
Percentage of Total Net Assets 208.60% [1] 208.00%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Aerospace and Defense    
Schedule of Investments [Line Items]    
Fair Value $ 137,956 $ 132,498
Percentage of Total Net Assets 11.40% 11.10%
Aerospace and Defense | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 5.50% 5.30%
Automotive    
Schedule of Investments [Line Items]    
Fair Value $ 71,897 $ 80,828
Percentage of Total Net Assets 5.90% 6.70%
Automotive | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.90% 3.30%
Banking, Finance, Insurance and Real Estate    
Schedule of Investments [Line Items]    
Fair Value $ 406,291 $ 401,816
Percentage of Total Net Assets 33.50% 33.60%
Banking, Finance, Insurance and Real Estate | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 16.10% 16.10%
Beverage, Food and Tobacco    
Schedule of Investments [Line Items]    
Fair Value $ 33,518 $ 23,135
Percentage of Total Net Assets 2.80% 1.90%
Beverage, Food and Tobacco | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.30% 0.90%
Capital Equipment    
Schedule of Investments [Line Items]    
Fair Value $ 136,168 $ 128,706
Percentage of Total Net Assets 11.20% 10.80%
Capital Equipment | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 5.40% 5.20%
Chemicals, Plastics, and Rubber    
Schedule of Investments [Line Items]    
Fair Value $ 40,937 $ 35,897
Percentage of Total Net Assets 3.40% 3.00%
Chemicals, Plastics, and Rubber | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.60% 1.50%
Construction and Building    
Schedule of Investments [Line Items]    
Fair Value $ 30,684 $ 30,387
Percentage of Total Net Assets 2.50% 2.50%
Construction and Building | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.20% 1.20%
Consumer goods: Durable    
Schedule of Investments [Line Items]    
Fair Value $ 49,236 $ 47,074
Percentage of Total Net Assets 4.10% 3.90%
Consumer goods: Durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.00% 1.90%
Consumer goods: Non-durable    
Schedule of Investments [Line Items]    
Fair Value $ 36,108 $ 28,210
Percentage of Total Net Assets 3.00% 2.40%
Consumer goods: Non-durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.40% 1.10%
Containers, Packaging and Glass    
Schedule of Investments [Line Items]    
Fair Value $ 37,542 $ 37,524
Percentage of Total Net Assets 3.10% 3.10%
Containers, Packaging and Glass | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.50% 1.50%
Energy: Electricity    
Schedule of Investments [Line Items]    
Fair Value $ 29,079 $ 20,874
Percentage of Total Net Assets 2.40% 1.70%
Energy: Electricity | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.20% 0.80%
Energy: Oil and Gas    
Schedule of Investments [Line Items]    
Fair Value $ 3,236 $ 3,240
Percentage of Total Net Assets 0.30% 0.30%
Energy: Oil and Gas | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.10% 0.10%
Environmental Industries    
Schedule of Investments [Line Items]    
Fair Value $ 51,501 $ 53,484
Percentage of Total Net Assets 4.20% 4.50%
Environmental Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.00% 2.10%
Healthcare and Pharmaceuticals    
Schedule of Investments [Line Items]    
Fair Value $ 190,321 $ 216,952
Percentage of Total Net Assets 15.70% 18.10%
Healthcare and Pharmaceuticals | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 7.50% 8.70%
High Tech Industries    
Schedule of Investments [Line Items]    
Fair Value $ 304,442 $ 303,082
Percentage of Total Net Assets 25.10% 25.40%
High Tech Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 12.00% 12.20%
Hotel, Gaming and Leisure    
Schedule of Investments [Line Items]    
Fair Value $ 55,991 $ 54,256
Percentage of Total Net Assets 4.60% 4.50%
Hotel, Gaming and Leisure | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.20% 2.20%
Investment Funds and Vehicles    
Schedule of Investments [Line Items]    
Fair Value $ 110,694 $ 110,066
Percentage of Total Net Assets 9.10% 9.20%
Investment Funds and Vehicles | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.40% 4.40%
Media: Advertising, Printing and Publishing    
Schedule of Investments [Line Items]    
Fair Value $ 38,931 $ 39,447
Percentage of Total Net Assets 3.20% 3.30%
Media: Advertising, Printing and Publishing | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.50% 1.60%
Media: Broadcasting and Subscription    
Schedule of Investments [Line Items]    
Fair Value $ 13,060 $ 13,277
Percentage of Total Net Assets 1.10% 1.10%
Media: Broadcasting and Subscription | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.50% 0.50%
Media: Diversified and Production    
Schedule of Investments [Line Items]    
Fair Value $ 65,449 $ 64,559
Percentage of Total Net Assets 5.40% 5.40%
Media: Diversified and Production | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.60% 2.60%
Metals and Mining    
Schedule of Investments [Line Items]    
Fair Value $ 9,015 $ 8,993
Percentage of Total Net Assets 0.70% 0.80%
Metals and Mining | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.40% 0.40%
Services: Business    
Schedule of Investments [Line Items]    
Fair Value $ 366,291 $ 326,762
Percentage of Total Net Assets 30.20% 27.30%
Services: Business | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 14.50% 13.20%
Services: Consumer    
Schedule of Investments [Line Items]    
Fair Value $ 61,307 $ 61,409
Percentage of Total Net Assets 5.10% 5.10%
Services: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.40% 2.50%
Structured products    
Schedule of Investments [Line Items]    
Fair Value $ 104,014 $ 102,922
Percentage of Total Net Assets 8.60% 8.60%
Structured products | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.10% 4.10%
Telecommunications    
Schedule of Investments [Line Items]    
Fair Value $ 27,535 $ 27,565
Percentage of Total Net Assets 2.30% 2.30%
Telecommunications | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.10% 1.10%
Transportation: Cargo    
Schedule of Investments [Line Items]    
Fair Value $ 88,075 $ 96,450
Percentage of Total Net Assets 7.30% 8.10%
Transportation: Cargo | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 3.50% 3.90%
Transportation: Consumer    
Schedule of Investments [Line Items]    
Fair Value $ 12,882 $ 11,951
Percentage of Total Net Assets 1.10% 1.00%
Transportation: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.50% 0.50%
Utilities: Electric    
Schedule of Investments [Line Items]    
Fair Value $ 15,377 $ 22,696
Percentage of Total Net Assets 1.30% 1.90%
Utilities: Electric | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.60% 0.90%
Utilities: Oil and Gas    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 4,655
Percentage of Total Net Assets 0.00% 0.40%
Utilities: Oil and Gas | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.20%
[1] Fair value as a percentage of net assets.