Fair Value of Financial Instruments - Summary of Fair Value Measurements of Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Fair Value Disclosures [Line Items]
Subtotal	$ 1,566,053	$ 1,528,941
Investments Measured at NAV	44,722	53,134
Total Investments	1,610,775	1,582,075
Foreign Currency Forward Contracts - Assets	2,765	5,128
Foreign Currency Forward Contracts - Liabilities	(42)	(84)
Level 2
Fair Value Disclosures [Line Items]
Subtotal	40,461	58,794
Foreign Currency Forward Contracts - Assets	2,765	5,128
Foreign Currency Forward Contracts - Liabilities	(42)	(84)
Level 3
Fair Value Disclosures [Line Items]
Subtotal	1,525,592	1,470,147
Investments Measured at NAV	1,525,592	1,470,147
Senior Secured First Lien
Fair Value Disclosures [Line Items]
Subtotal	432,906	429,210
Senior Secured First Lien | Level 2
Fair Value Disclosures [Line Items]
Subtotal		19,265
Senior Secured First Lien | Level 3
Fair Value Disclosures [Line Items]
Subtotal	432,906	409,945
Unitranche First Lien
Fair Value Disclosures [Line Items]
Subtotal	1,005,267	973,864
Unitranche First Lien | Level 2
Fair Value Disclosures [Line Items]
Subtotal	25,001	25,083
Unitranche First Lien | Level 3
Fair Value Disclosures [Line Items]
Subtotal	980,266	948,781
Unitranche First Lien Last Out
Fair Value Disclosures [Line Items]
Subtotal	5,604	13,544
Unitranche First Lien Last Out | Level 3
Fair Value Disclosures [Line Items]
Subtotal	5,604	13,544
Senior Secured Second Lien
Fair Value Disclosures [Line Items]
Subtotal	49,487	58,212
Senior Secured Second Lien | Level 2
Fair Value Disclosures [Line Items]
Subtotal	14,279	13,305
Senior Secured Second Lien | Level 3
Fair Value Disclosures [Line Items]
Subtotal	35,208	44,907
Unsecured Debt
Fair Value Disclosures [Line Items]
Subtotal	15,633	4,061
Unsecured Debt | Level 3
Fair Value Disclosures [Line Items]
Subtotal	15,633	4,061
Equity & Other
Fair Value Disclosures [Line Items]
Subtotal	57,156	50,050
Equity & Other | Level 2
Fair Value Disclosures [Line Items]
Subtotal	1,181	1,141
Equity & Other | Level 3
Fair Value Disclosures [Line Items]
Subtotal	$ 55,975	$ 48,909