INVESTMENTS - Schedule of Investments (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2024		Dec. 31, 2023
Schedule of Investments [Line Items]
Amortized Cost	$ 2,075,365		$ 1,666,169
Fair Value	2,046,887		1,641,686
Investments at fair value	2,109,367	[1]	1,706,163	[2]
Subordinated Debt, Second Lien
Schedule of Investments [Line Items]
Amortized Cost	80,348		100,711
Investments at fair value	67,947		97,203
Subordinated Debt, Mezzanine Debt
Schedule of Investments [Line Items]
Amortized Cost	105,364		86,495
Investments at fair value	99,925		83,528
Structured Debt
Schedule of Investments [Line Items]
Amortized Cost	4,304		3,247
Investments at fair value	$ 1,583		$ 2,656
Investment Owned at Fair Value | Investment Type Concentration Risk
Schedule of Investments [Line Items]
% of Total Investments at Fair Value	100.00%		100.00%
First-Lien Debt
Schedule of Investments [Line Items]
Amortized Cost	$ 1,855,467		$ 1,450,120
Fair Value	$ 1,843,607		$ 1,427,492
First-Lien Debt | Investment Owned at Fair Value | Investment Type Concentration Risk
Schedule of Investments [Line Items]
% of Total Investments at Fair Value	90.07%		86.95%
Subordinated Debt
Schedule of Investments [Line Items]
Amortized Cost	$ 190,016		$ 190,454
Fair Value	$ 169,455		$ 183,387
Subordinated Debt | Investment Owned at Fair Value | Investment Type Concentration Risk
Schedule of Investments [Line Items]
% of Total Investments at Fair Value	8.28%		11.17%
Equity Investments
Schedule of Investments [Line Items]
Amortized Cost	$ 29,882		$ 25,595
Fair Value	33,825		30,807
Investments at fair value	$ 33,825	[1]	$ 30,807	[2]
Equity Investments | Investment Owned at Fair Value | Investment Type Concentration Risk
Schedule of Investments [Line Items]
% of Total Investments at Fair Value	1.65%		1.88%

[1] Investment valued using unobservable inputs (Level 3). See Note 2 “Significant Accounting Policies – Valuation of Portfolio Investments” and Note 4 "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 4 "Fair Value Measurements" for more information.