GOODWILL AND INTANGIBLE ASSETS (Goodwill) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 143,855
Goodwill acquired during period	224,601
Foreign currency translation	1,038
Goodwill, ending balance	369,494
Credit Group
Goodwill [Roll Forward]
Goodwill, beginning balance	32,196
Goodwill acquired during period	0
Foreign currency translation	0
Goodwill, ending balance	32,196
Private Equity Group
Goodwill [Roll Forward]
Goodwill, beginning balance	58,600
Goodwill acquired during period	0
Foreign currency translation	0
Goodwill, ending balance	58,600
Real Estate Group
Goodwill [Roll Forward]
Goodwill, beginning balance	53,059
Goodwill acquired during period	0
Foreign currency translation	(48)
Goodwill, ending balance	53,011
Strategic Initiatives
Goodwill [Roll Forward]
Goodwill, beginning balance	0
Goodwill acquired during period	224,601
Foreign currency translation	1,086
Goodwill, ending balance	$ 225,687