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Unaudited Consolidated Schedule of Investments - Schedule of Investment Portfolio at Cost and Fair Value (Parenthetical) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Cost $ 2,446,920 $ 2,535,576
Fair Value $ 2,416,714 $ 2,488,715
Percentage of Total Net Assets 202.30% [1] 208.00% [2]
Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Cost $ 1,659,800 $ 1,705,353
Fair Value $ 1,632,057 $ 1,670,300
Percentage of Total Net Assets 137.00% 140.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 68.00% 67.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 68.00% 67.00%
Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Cost $ 214,860 $ 256,850
Fair Value $ 199,971 $ 238,215
Percentage of Total Net Assets 17.00% 20.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 9.00% 10.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 8.00% 10.00%
Structured products    
Schedule of Investments [Line Items]    
Cost $ 99,154 $ 107,314
Fair Value $ 91,493 $ 93,038
Percentage of Total Net Assets 7.00% 8.00%
Structured products | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.00% 4.00%
Structured products | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.00% 4.00%
Equity shares    
Schedule of Investments [Line Items]    
Cost $ 328,635 $ 320,335
Fair Value $ 382,531 $ 374,704
Percentage of Total Net Assets 32.00% 31.00%
Equity shares | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 13.00% 13.00%
Equity shares | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 16.00% 15.00%
Equity warrants    
Schedule of Investments [Line Items]    
Cost $ 76 $ 76
Fair Value $ 2,600 $ 2,392
Percentage of Total Net Assets 0.00% 0.00%
Equity warrants | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Equity warrants | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Royalty rights    
Schedule of Investments [Line Items]    
Cost $ 3,790  
Fair Value $ 3,819  
Percentage of Total Net Assets 0.00%  
Royalty rights | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00%  
Royalty rights | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00%  
Investment in joint ventures / PE fund    
Schedule of Investments [Line Items]    
Cost $ 140,605 $ 145,648
Fair Value $ 104,243 $ 110,066
Percentage of Total Net Assets 9.00% 9.00%
Investment in joint ventures / PE fund | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 6.00% 6.00%
Investment in joint ventures / PE fund | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.00% 4.00%
[1] Fair value as a percentage of net assets.
[2] Fair value as a percentage of net assets.