SEGMENT REPORTING (Reconciliation of Income Before Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Economic net income
Income (loss) before taxes	$ (296,413)	$ 135,960
Adjustments:
Equity compensation expense	32,557	27,552
Consolidated Funds
Adjustments:
Income (loss) before taxes of non-controlling interests in Consolidated Funds, net of eliminations	(166,406)	17,624
Total investment income - realized	(113,225)	(93,184)
Operating segment
Economic net income
Income (loss) before taxes	(296,413)	135,960
Adjustments:
Depreciation and amortization expense	5,542	5,824
Equity compensation expense	32,557	27,552
Transaction support expense	3,137	1,773
Deferred placement fees	5,415	521
Other expense	0	(1)
Total performance (income) loss - unrealized	387,657	(146,575)
Total performance related compensation - unrealized	(285,892)	107,303
Total investment (income) loss - unrealized	100,633	(11,205)
Realized income	198,383	158,306
Total performance income - realized	(151,770)	(68,573)
Total performance related compensation - realized	117,993	49,217
Total investment income - realized	(13,771)	(14,385)
Fee related earnings	150,835	124,565
Operating segment \| Consolidated Funds
Adjustments:
Income (loss) before taxes of non-controlling interests in Consolidated Funds, net of eliminations	166,378	(17,045)
OMG
Adjustments:
OMG expense, net	58,872	53,323
Realized income	64,238	53,674
Total performance income - realized	0	0
Total performance related compensation - realized	0	0
Total investment income - realized	6,507	381
Fee related earnings	(57,731)	(53,293)
Subsidiaries \| Operating segment
Adjustments:
Income (loss) before taxes of non-controlling interests in Consolidated Funds, net of eliminations	$ 20,497	$ 876

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