Investments - Composition of Investment Portfolio At Cost And Fair Value (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024		Dec. 31, 2023		May 12, 2021
Schedule of Equity Method Investments [Line Items]
Cost		$ 3,117,330		$ 2,467,727		$ 602,400
Fair Value		$ 3,094,065		$ 2,458,929
Percent of Total Net Assets		156.50%	[1]	188.10%	[2]
Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio		100.00%		100.00%
Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio		100.00%		100.00%
Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Cost		$ 2,552,342		$ 1,981,715
Fair Value		$ 2,503,156		$ 1,958,306
Percent of Total Net Assets		127.00%		150.00%
Senior debt and 1st lien notes | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio		82.00%		80.00%
Senior debt and 1st lien notes | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio		81.00%		80.00%
Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Cost		$ 125,971		$ 158,720
Fair Value		$ 122,748		$ 148,450
Percent of Total Net Assets		6.00%		11.00%
Subordinated debt and 2nd lien notes | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio		4.00%		7.00%
Subordinated debt and 2nd lien notes | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio		4.00%		6.00%
Structured products
Schedule of Equity Method Investments [Line Items]
Cost		$ 79,722		$ 27,146
Fair Value		$ 80,401		$ 23,947
Percent of Total Net Assets		4.00%		2.00%
Structured products | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio		3.00%		1.00%
Structured products | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio		3.00%		1.00%
Equity shares
Schedule of Equity Method Investments [Line Items]
Cost		$ 298,038		$ 254,999
Fair Value		$ 337,684		$ 297,213
Percent of Total Net Assets		17.00%		23.00%
Equity shares | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio		10.00%		10.00%
Equity shares | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio		11.00%		12.00%
Equity warrants
Schedule of Equity Method Investments [Line Items]
Cost		$ 4		$ 4
Fair Value		$ 2,813		$ 2,475
Percent of Total Net Assets		0.00%		0.00%
Equity warrants | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio		0.00%		0.00%
Equity warrants | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio		0.00%		0.00%
Royalty rights
Schedule of Equity Method Investments [Line Items]
Cost		$ 9,066
Fair Value		$ 14,583
Percent of Total Net Assets		1.00%
Royalty rights | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio		0.00%
Royalty rights | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio		0.00%
Investment in joint ventures
Schedule of Equity Method Investments [Line Items]
Cost		$ 41,986		$ 45,143
Fair Value		$ 22,480		$ 28,538
Percent of Total Net Assets		1.00%		2.00%
Investment in joint ventures | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio		1.00%		2.00%
Investment in joint ventures | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio		1.00%		1.00%
Short-term investments
Schedule of Equity Method Investments [Line Items]
Cost		$ 10,201		$ 0
Fair Value		$ 10,200		$ 0
Percent of Total Net Assets	[1]	0.50%
Short-term investments | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio		0.00%
Short-term investments | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio		0.00%

[1] Fair value as a percentage of net assets.

[2] Fair value as a percentage of net assets.