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BUSINESS COMBINATIONS - PURCHASE PRICE (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 29, 2017
Dec. 31, 2017
Dec. 31, 2016
Class A Common Stock      
Business Acquisition      
Common stock   $ 63 $ 0
Angie's List      
Business Acquisition      
Cash consideration for holders who elected to receive $8.50 in cash per share of Angie's List common stock $ 1,900 $ 35,621  
Total purchase price 781,384    
Angie's List | Class A Common Stock      
Business Acquisition      
Common stock 763,684    
Cash consideration for holders who elected to receive $8.50 in cash per share of Angie's List common stock 1,913    
Angie's List | Class A Common Stock | Stock Options      
Business Acquisition      
Consideration transferred, equity interests 11,749    
Angie's List | Class A Common Stock | RSUs      
Business Acquisition      
Consideration transferred, equity interests $ 4,038