Investments - Summary of Investments at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Summary Of Investment Holdings [Line Items]
Cost	$ 1,612,888	$ 1,592,688
Fair Value	1,610,775	1,582,075
Unrealized Appreciation/ (Depreciation)	(2,113)	(10,613)
Senior Secured First Lien
Summary Of Investment Holdings [Line Items]
Cost	439,999	436,249
Fair Value	432,906	429,210
Unrealized Appreciation/ (Depreciation)	(7,093)	(7,039)
Unitranche First Lien
Summary Of Investment Holdings [Line Items]
Cost	1,003,730	976,366
Fair Value	1,005,267	973,864
Unrealized Appreciation/ (Depreciation)	1,537	(2,502)
Unitranche First Lien Last Out
Summary Of Investment Holdings [Line Items]
Cost	5,436	15,627
Fair Value	5,604	13,544
Unrealized Appreciation/ (Depreciation)	168	(2,083)
Senior Secured Second Lien
Summary Of Investment Holdings [Line Items]
Cost	53,948	62,659
Fair Value	49,487	58,212
Unrealized Appreciation/ (Depreciation)	(4,461)	(4,447)
Unsecured Debt One
Summary Of Investment Holdings [Line Items]
Cost	14,681	3,915
Fair Value	15,633	4,061
Unrealized Appreciation/ (Depreciation)	952	146
Equity & Other
Summary Of Investment Holdings [Line Items]
Cost	42,861	40,165
Fair Value	57,156	50,050
Unrealized Appreciation/ (Depreciation)	14,295	9,885
LLC/LP Equity Interests
Summary Of Investment Holdings [Line Items]
Cost	52,233	57,707
Fair Value	44,722	53,134
Unrealized Appreciation/ (Depreciation)	$ (7,511)	$ (4,573)