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INVESTMENTS - Narrative (Details) - USD ($)
12 Months Ended 36 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Schedule of Cost-method Investments [Line Items]        
Impairment loss on investment in unconsolidated affiliate $ 2,170,000 $ 20,696,000  
Unrealized losses on investments in debt or marketable equity securities       $ 0
Impairment losses on debt and equity securities       $ 0
Impairment loss on unconsolidated affiliate   2,170,000    
Equity in loss of unconsolidated affiliate 3,422,000  
Klablab        
Schedule of Cost-method Investments [Line Items]        
Ownership percentage   51.00%    
Synthonics        
Schedule of Cost-method Investments [Line Items]        
Voting interest percentage 18.30%     18.30%
Mindjet        
Schedule of Cost-method Investments [Line Items]        
Voting interest percentage 19.30%     19.30%
Carrying value of other investments $ 2,300,000 $ 2,300,000   $ 2,300,000
Abandonment of business | Klablab        
Schedule of Cost-method Investments [Line Items]        
Loss on abandonment   $ 2,000,000    
Equity Securities | Mindjet        
Schedule of Cost-method Investments [Line Items]        
Equity method investment     $ 0