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RELATED PARTY TRANSACTIONS WITH IAC - Narrative (Details) - USD ($)
shares in Millions
3 Months Ended 12 Months Ended
Oct. 10, 2018
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Services Agreement          
Related Party Transaction [Line Items]          
Automatic renewal periods for related party agreement     1 year    
Employee Matters Agreement          
Related Party Transaction [Line Items]          
Voting interest (as a percent)     80.00%    
IAC | Services Agreement          
Related Party Transaction [Line Items]          
Payments received from related parties     $ 4,800,000 $ 4,800,000 $ 5,700,000
Amounts due to related party     0 0 $ 100,000
IAC | Tax Sharing Agreement          
Related Party Transaction [Line Items]          
Payments of distributions to affiliates   $ 11,400,000      
Taxes payable     $ 900,000 $ 200,000  
IAC | Employee Matters Agreement          
Related Party Transaction [Line Items]          
Shares received from related party pursuant to employee matters agreement (in shares)     0.3 0.5 0.9
IAC | Sublease Agreement          
Related Party Transaction [Line Items]          
Payments received from related parties     $ 1,800,000 $ 1,400,000  
IAC | Angie's List Transaction Agreement | Class B Common Stock          
Related Party Transaction [Line Items]          
Stock received from related party (shares) 5.1        
IAC | Tax Sharing Agreement          
Related Party Transaction [Line Items]          
Refunds received from related party     3,100,000    
IAC | Sublease Agreement          
Related Party Transaction [Line Items]          
Amounts due from related party     $ 100,000 $ 100,000