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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Jun. 01, 2017
Dec. 31, 2016
Goodwill [Line Items]      
Carrying value of goodwill $ 83,500   $ 89,000
Public Markets      
Goodwill [Line Items]      
Carrying value of goodwill 53,500   59,000
Principal Activities      
Goodwill [Line Items]      
Carrying value of goodwill $ 30,000   $ 30,000
PAAMCO Prisma      
Goodwill [Line Items]      
Carrying value of goodwill   $ 5,500