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BUSINESS COMBINATIONS AND OTHER SALE TRANSACTIONS - The Palisades Group Sale Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
May 05, 2016
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Stated interest rate 10.00%        
Note receivable $ 5,000,000        
Gain on sale of The Palisades Group     $ 0 $ 163,000 $ 456,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | The Palisades Group          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on sale of The Palisades Group $ 3,700,000   3,694,000    
The Note   $ 2,400,000 $ 2,370,000    
Gain on repayment of notes receivable   $ 2,800,000