GOODWILL AND INTANGIBLE ASSETS (Goodwill) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 143,855,000
Foreign currency translation	(113,000)
Goodwill, ending balance	143,742,000
Goodwill impairment	0	$ 0
Credit Group
Goodwill [Roll Forward]
Goodwill, beginning balance	32,196,000
Foreign currency translation	0
Goodwill, ending balance	32,196,000
Private Equity Group
Goodwill [Roll Forward]
Goodwill, beginning balance	58,600,000
Foreign currency translation	0
Goodwill, ending balance	58,600,000
Real Estate Group
Goodwill [Roll Forward]
Goodwill, beginning balance	53,059,000
Foreign currency translation	(113,000)
Goodwill, ending balance	$ 52,946,000