MEMBERS' CAPITAL - Distributions Declared and Payable (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Dividends Payable [Line Items]
Per Unit Amount (in dollars per unit)			$ 0.94	$ 1.05
Total Amount	$ 31,299	$ 29,774	$ 61,798	$ 60,422
O 2025 Q1 Aggregate Dividends
Dividends Payable [Line Items]
Per Unit Amount (in dollars per unit)				$ 0.54
Total Amount				$ 30,648
O 2025 Q2 Aggregate Dividends
Dividends Payable [Line Items]
Per Unit Amount (in dollars per unit)				$ 0.51
Total Amount				$ 29,774
O 2026 Q1 Aggregate Dividends
Dividends Payable [Line Items]
Per Unit Amount (in dollars per unit)			$ 0.47
Total Amount			$ 30,499
O 2026 Q2 Aggregate Dividends
Dividends Payable [Line Items]
Per Unit Amount (in dollars per unit)			$ 0.47
Total Amount			$ 31,299