Investments at Fair Value - Summary of Investments at Fair Value (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	[1]	$ 3,539,153	$ 3,251,012
Fair Value		3,518,412	3,283,065
Net Unrealized Gain (Loss)		(20,741)	32,053
First-lien Debt Investments
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	[1]	3,298,006	2,956,079
Fair Value		3,302,504	2,996,177
Net Unrealized Gain (Loss)		4,498	40,098
Second-lien Debt Investments
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	[1]	53,151	51,423
Fair Value		19,844	35,975
Net Unrealized Gain (Loss)		(33,307)	(15,448)
Mezzanine Debt Investments
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	[1]	37,087	38,022
Fair Value		39,091	39,471
Net Unrealized Gain (Loss)		2,004	1,449
Equity and Other Investments
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	[1]	149,409	152,623
Fair Value		155,501	155,600
Net Unrealized Gain (Loss)		6,092	2,977
Structured Credit Investments
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	[1]	1,500	52,865
Fair Value		1,472	55,842
Net Unrealized Gain (Loss)		$ (28)	$ 2,977

[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.