EQUITY SECURITIES PORTFOLIO INVESTMENT - Narrative (Details) $ in Thousands, £ in Millions			3 Months Ended		6 Months Ended
	Apr. 03, 2020 USD ($)	Apr. 03, 2020 GBP (£)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Dec. 03, 2020
Offsetting Liabilities [Line Items]
Impairment of equity method investment			$ (30,934)	$ 0	$ (30,934)	$ 0
Noncontrolling Interests in Operating Subsidiaries
Offsetting Liabilities [Line Items]
Contributions from noncontrolling interests in subsidiaries					11,000
Life Sciences Portfolio
Offsetting Liabilities [Line Items]
Investment at fair value			$ 5,800		$ 5,800
MalinJ1
Offsetting Liabilities [Line Items]
Ownership percentage							63.90%
MalinJ1 | MalinJ1
Offsetting Liabilities [Line Items]
Equity method investment ownership			41.00%		41.00%
Option Agreement | Portfolio Companies
Offsetting Liabilities [Line Items]
Payments to acquire investments	$ 277,500	£ 223.9