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BUSINESS COMBINATION - Preliminary Estimated Fair Value of Intangible Assets Acquired (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 29, 2017
Dec. 31, 2018
Acquired Intangible Assets [Line Items]    
Weighted-Average Useful Life (Years)   18 months
Angie's List    
Acquired Intangible Assets [Line Items]    
Total identifiable intangible assets acquired $ 317,300  
Angie's List | Service providers    
Acquired Intangible Assets [Line Items]    
Finite-lived intangible assets acquired $ 90,500  
Weighted-Average Useful Life (Years) 3 years  
Angie's List | Developed technology    
Acquired Intangible Assets [Line Items]    
Finite-lived intangible assets acquired $ 63,900  
Weighted-Average Useful Life (Years) 6 years  
Angie's List | Memberships    
Acquired Intangible Assets [Line Items]    
Finite-lived intangible assets acquired $ 15,900  
Weighted-Average Useful Life (Years) 3 years  
Angie's List | User base    
Acquired Intangible Assets [Line Items]    
Finite-lived intangible assets acquired $ 10,000  
Weighted-Average Useful Life (Years) 1 year  
Angie's List | Indefinite-lived trade names and trademarks    
Acquired Intangible Assets [Line Items]    
Indefinite-lived trade name and trademarks $ 137,000