FAIR VALUE - Consolidated Funds Summary of Changes in Fair Value of Level III Investments (Details) - Consolidated Funds - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 2,390,273	$ 1,928,376
Transfers into Level III	5,580	5,819
Transfers out of Level III	(5,451)	(23,164)
Purchases	335,934	548,904
Sales	(63,287)	(108,874)
Realized gain (losses), net	21,656	(125,513)
Unrealized appreciation (depreciation), net	(17,511)	187,153
Ending balance	2,667,194	2,412,701
Net change in unrealized appreciation (depreciation) attributable to assets still held at end of period	(17,654)	(521)
Corporate debt – bank debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	702,497	597,188
Transfers into Level III	159	4,407
Transfers out of Level III	(4,473)	(20,683)
Purchases	278,808	351,155
Sales	(2,863)	(65,804)
Realized gain (losses), net	31	2,888
Unrealized appreciation (depreciation), net	(11,843)	(1,857)
Ending balance	962,316	867,294
Net change in unrealized appreciation (depreciation) attributable to assets still held at end of period	(11,987)	(486)
Corporate debt – all other
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	219,503	229,576
Transfers into Level III	5,421	1,412
Transfers out of Level III	(978)	(2,475)
Purchases	657	1,962
Sales	0	(7)
Realized gain (losses), net	(228)	(22)
Unrealized appreciation (depreciation), net	2,789	(5,956)
Ending balance	227,164	224,490
Net change in unrealized appreciation (depreciation) attributable to assets still held at end of period	2,789	(67)
Equities – common stock
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	777,198	581,748
Transfers into Level III	0	0
Transfers out of Level III	0	(6)
Purchases	44,992	100,462
Sales	(25,201)	(43,063)
Realized gain (losses), net	12,868	(128,379)
Unrealized appreciation (depreciation), net	(48)	179,516
Ending balance	809,809	690,278
Net change in unrealized appreciation (depreciation) attributable to assets still held at end of period	(49)	37
Equities – Preferred Stock
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	616,604	486,030
Transfers into Level III	0	0
Transfers out of Level III	0	0
Purchases	4,191	91,378
Sales	(35,223)	0
Realized gain (losses), net	8,987	0
Unrealized appreciation (depreciation), net	(11,959)	16,344
Ending balance	582,600	593,752
Net change in unrealized appreciation (depreciation) attributable to assets still held at end of period	(11,959)	(7)
Real estate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	74,471	33,834
Transfers into Level III	0	0
Transfers out of Level III	0	0
Purchases	7,286	3,947
Sales	0	0
Realized gain (losses), net	(2)	0
Unrealized appreciation (depreciation), net	3,550	(894)
Ending balance	85,305	36,887
Net change in unrealized appreciation (depreciation) attributable to assets still held at end of period	$ 3,552	$ 2