INVESTMENTS - Schedule of Investments (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2025		Dec. 31, 2024
Schedule of Investments [Line Items]
Cost	$ 1,999,126		$ 2,098,575
Fair Value	1,967,882		2,081,379
Investments at fair value	2,009,911	[1]	2,122,221	[2]
Subordinated Debt, Second Lien
Schedule of Investments [Line Items]
Cost	76,695		71,622
Investments at fair value	72,488		67,780
Subordinated Debt, Mezzanine Debt
Schedule of Investments [Line Items]
Cost	94,207		94,978
Investments at fair value	83,950		89,740
Structured Debt
Schedule of Investments [Line Items]
Cost	4,525		4,357
Investments at fair value	$ 2,489		$ 1,618
Investment Owned at Fair Value | Investment Type Concentration Risk
Schedule of Investments [Line Items]
% of Fair Value	100.00%		100.00%
First-Lien Debt
Schedule of Investments [Line Items]
Cost	$ 1,780,984		$ 1,893,409
Fair Value	$ 1,768,014		$ 1,885,643
First-Lien Debt | Investment Owned at Fair Value | Investment Type Concentration Risk
Schedule of Investments [Line Items]
% of Fair Value	89.84%		90.59%
Subordinated Debt
Schedule of Investments [Line Items]
Cost	$ 175,427		$ 170,957
Fair Value	$ 158,927		$ 159,138
Subordinated Debt | Investment Owned at Fair Value | Investment Type Concentration Risk
Schedule of Investments [Line Items]
% of Fair Value	8.08%		7.65%
Equity Investments
Schedule of Investments [Line Items]
Cost	$ 42,715		$ 34,209
Fair Value	40,941		36,598
Investments at fair value	$ 40,941	[1]	$ 36,598	[2]
Equity Investments | Investment Owned at Fair Value | Investment Type Concentration Risk
Schedule of Investments [Line Items]
% of Fair Value	2.08%		1.76%

[1] Investment valued using unobservable inputs (Level 3), unless noted otherwise. See Note 2 “Significant Accounting Policies – Valuation of Portfolio Investments” and Note 5 "Fair Value Measurements" for more information.

[2] Investment valued using unobservable inputs (Level 3). See Note 2 “Significant Accounting Policies – Valuation of Portfolio Investments” and Note 5 "Fair Value Measurements" for more information.