INVESTMENTS - Schedule of Net Gains (Losses) from Investment Activities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	$ 74,577	$ (51,776)
Net Change in Unrealized Appreciation (Depreciation) on Investments	(127,849)	117,474
Consolidated VIEs \| Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	74,577	(51,776)
Net Change in Unrealized Appreciation (Depreciation) on Investments	(127,849)	117,474
Consolidated VIEs \| Investments and other financial instruments \| Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	68,510	(55,747)
Net Change in Unrealized Appreciation (Depreciation) on Investments	(101,214)	111,713
Consolidated VIEs \| CLO liabilities \| Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	0	35
Net Change in Unrealized Appreciation (Depreciation) on Investments	0	1,362
Consolidated VIEs \| Foreign-currency forward contracts \| Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	5,455	(351)
Net Change in Unrealized Appreciation (Depreciation) on Investments	(25,471)	5,735
Consolidated VIEs \| Total return and interest rate swaps \| Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	(627)	0
Net Change in Unrealized Appreciation (Depreciation) on Investments	716	633
Consolidated VIEs \| Options and futures \| Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	1,239	(206)
Net Change in Unrealized Appreciation (Depreciation) on Investments	(1,880)	(388)
Consolidated VIEs \| Commodity swaps \| Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	0	4,493
Net Change in Unrealized Appreciation (Depreciation) on Investments	$ 0	$ (1,581)