Investments at Fair Value - Summary of Investments at Fair Value (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	[1]	$ 3,323,282	$ 3,539,153
Fair Value		3,347,317	3,518,412
Net Unrealized Gain (Loss)		24,035	(20,741)
First-lien Debt Investments
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	[1]	2,934,162	3,298,006
Fair Value		2,984,501	3,302,504
Net Unrealized Gain (Loss)		50,339	4,498
Second-lien Debt Investments
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	[1]	69,631	53,151
Fair Value		30,678	19,844
Net Unrealized Gain (Loss)		(38,953)	(33,307)
Mezzanine Debt Investments
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	[1]	61,150	37,087
Fair Value		61,684	39,091
Net Unrealized Gain (Loss)		534	2,004
Equity and Other Investments
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	[1]	159,782	149,409
Fair Value		172,582	155,501
Net Unrealized Gain (Loss)		12,800	6,092
Structured Credit Investments
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	[1]	98,557	1,500
Fair Value		97,872	1,472
Net Unrealized Gain (Loss)		$ (685)	$ (28)

[1] The amortized cost represents the original cost adjusted for the amortization of discounts or premiums, as applicable, on debt investments using the effective interest method.