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Unaudited Consolidated Schedule Of Investments - Schedule Of Investment Portfolio at Cost and Fair value(Parenthetical) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024		Dec. 31, 2023
Schedule of Investments [Line Items]
Cost	$ 2,551,299		$ 2,535,576
Fair Value	$ 2,527,537		$ 2,488,715
Percentage of Total Net Assets	208.60%	[1]	208.00%
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	$ 1,699,117		$ 1,705,353
Fair Value	$ 1,658,742		$ 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	67.00%		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	66.00%		67.00%
Subordinated debt and 2nd lien notes
Schedule of Investments [Line Items]
Cost	$ 260,225		$ 256,850
Fair Value	$ 246,902		$ 238,215
Percentage of Total Net Assets	21.00%		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	10.00%		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	10.00%		10.00%
Structured products
Schedule of Investments [Line Items]
Cost	$ 105,043		$ 107,314
Fair Value	$ 95,131		$ 93,038
Percentage of Total Net Assets	8.00%		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	$ 343,533		$ 320,335
Fair Value	$ 413,482		$ 374,704
Percentage of Total Net Assets	34.00%		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	$ 129		$ 76
Fair Value	$ 2,586		$ 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%
Investment in joint ventures / PE fund
Schedule of Investments [Line Items]
Cost	$ 143,252		$ 145,648
Fair Value	$ 110,694		$ 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.

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