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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 18, 2018
Oct. 24, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]            
Amortization expense         $ 5.1 $ 5.5
China Branding Group Limited            
Finite-Lived Intangible Assets [Line Items]            
Impairment of intangible assets     $ 0.6 $ 5.8    
Certain Domain Names And Related Rights And Property | Intersearch Tax Solutions, Inc. (ITS)            
Finite-Lived Intangible Assets [Line Items]            
Proceeds from sale of other assets   $ 0.1        
Receivable with imputed interest   $ 0.2        
Tax extension related revenue generated, percent to be received   25.00%        
Percent of gross profit to be received in excess of threshold generated by sold properties   35.00%        
Gross profit threshold generated by sold properties   $ 0.3        
Receivable with imputed interest, effective yield (interest rate)   5.00%        
Receivable with imputed interest, principal amount due annually   $ 0.1        
Banks.com Domain Name And Related Rights And Property | Simply FinTech            
Finite-Lived Intangible Assets [Line Items]            
Proceeds from sale of other assets $ 0.5          
Gain on sale $ 0.4