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SUPPLEMENTAL CASH FLOW INFORMATION - NARRATIVE (Details) - Common Stock - USD ($)
shares in Thousands, $ in Thousands
Dec. 31, 2017
Sep. 29, 2017
Dec. 31, 2016
Class of Stock [Line Items]      
Common stock issued (shares) 62,818   0
Common stock $ 63   $ 0
Angie's List      
Class of Stock [Line Items]      
Common stock issued (shares)   61,300  
Common stock   $ 763,684