Investments - Summary of Investments at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Summary Of Investment Holdings [Line Items]
Cost	$ 1,592,688	$ 1,291,456
Fair Value	1,582,075	1,262,956
Unrealized Appreciation/ (Depreciation)	(10,613)	(28,500)
Senior Secured First Lien
Summary Of Investment Holdings [Line Items]
Cost	436,249	312,345
Fair Value	429,210	301,001
Unrealized Appreciation/ (Depreciation)	(7,039)	(11,344)
Unitranche First Lien
Summary Of Investment Holdings [Line Items]
Cost	976,366	842,867
Fair Value	973,864	824,107
Unrealized Appreciation/ (Depreciation)	(2,502)	(18,760)
Unitranche First Lien Last Out
Summary Of Investment Holdings [Line Items]
Cost	15,627	14,879
Fair Value	13,544	13,827
Unrealized Appreciation/ (Depreciation)	(2,083)	(1,052)
Senior Secured Second Lien
Summary Of Investment Holdings [Line Items]
Cost	62,659	67,001
Fair Value	58,212	60,877
Unrealized Appreciation/ (Depreciation)	(4,447)	(6,124)
Unsecured Debt One
Summary Of Investment Holdings [Line Items]
Cost	3,915	4,984
Fair Value	4,061	4,533
Unrealized Appreciation/ (Depreciation)	146	(451)
Equity & Other
Summary Of Investment Holdings [Line Items]
Cost	40,165	35,993
Fair Value	50,050	44,851
Unrealized Appreciation/ (Depreciation)	9,885	8,858
LLC/LP Equity Interests
Summary Of Investment Holdings [Line Items]
Cost	57,707	13,387
Fair Value	53,134	13,760
Unrealized Appreciation/ (Depreciation)	$ (4,573)	$ 373