BORROWINGS - Schedule of Components of Interest Expense and Debt Financing Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Debt Instrument [Line Items]
Borrowing interest expense	$ 18,353	$ 22,287	$ 56,071	$ 55,313
Unused fees	230	232	701	909
Accretion of original issue discount	28	0	77	0
Amortization of deferred financing costs	601	679	3,150	2,638
Net fair value adjustment for hedging transaction	(6)	0	(45)	0
Total interest and debt financing expenses	$ 19,206	$ 23,198	$ 59,954	$ 58,860
Average interest rate	6.64%	7.74%	6.61%	7.70%
Average daily borrowings	$ 1,109,586	$ 1,156,703	$ 1,148,593	$ 974,676
Wells Fargo Financing Facility | Credit Facility | Secured Debt
Debt Instrument [Line Items]
Borrowing interest expense	0	1,783	396	5,596
Unused fees	0	109	55	285
Amortization of deferred financing costs	0	73	734	941
Total interest and debt financing expenses	0	1,965	1,185	6,822
SMBC Financing Facility | Credit Facility | Secured Debt
Debt Instrument [Line Items]
Borrowing interest expense	0	3,582	0	5,680
Unused fees	0	18	0	187
Amortization of deferred financing costs	0	112	0	333
Total interest and debt financing expenses	0	3,712	0	6,200
Revolving Credit Facility | Credit Facility | Secured Debt
Debt Instrument [Line Items]
Borrowing interest expense	1,015	2,377	5,317	4,091
Unused fees	230	105	646	437
Amortization of deferred financing costs	120	130	355	360
Total interest and debt financing expenses	1,365	2,612	6,318	4,888
CLO-I | Credit Facility | Secured Debt
Debt Instrument [Line Items]
Borrowing interest expense	4,769	6,204	14,565	18,390
Amortization of deferred financing costs	84	152	957	452
Total interest and debt financing expenses	4,853	6,356	15,522	18,842
CLO-II | Credit Facility | Secured Debt
Debt Instrument [Line Items]
Borrowing interest expense	3,718	4,280	11,056	12,752
Amortization of deferred financing costs	104	111	279	332
Total interest and debt financing expenses	3,822	4,391	11,335	13,084
CLO-III | Credit Facility | Secured Debt
Debt Instrument [Line Items]
Borrowing interest expense	3,514	4,061	10,446	8,804
Amortization of deferred financing costs	101	101	299	220
Total interest and debt financing expenses	3,615	4,162	10,745	9,024
2030 Notes | Credit Facility | Secured Debt
Debt Instrument [Line Items]
Borrowing interest expense	5,337	0	14,291	0
Accretion of original issue discount	28	0	77	0
Amortization of deferred financing costs	192	0	526	0
Net fair value adjustment for hedging transaction	(6)	0	(45)	0
Total interest and debt financing expenses	$ 5,551	$ 0	$ 14,849	$ 0