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Disposition of Buyer Platform - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 07, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disposition        
Other income to be recognized related to sale of trade name rights $ 1,000      
Time period for ratable recognition of other income 18 months      
Gain on sale of discontinued operations, net of income taxes   $ 14,626 $ 0 $ 0
Discontinued operations, disposed of by sale | Buyer Platform        
Disposition        
Gain on sale of discontinued operations, net of income taxes $ 14,626 $ 14,626 $ 0 $ 0
Discontinued operations, disposed of by sale | Buyer Platform | Taptica Ltd        
Disposition        
Total consideration 50,000      
Trade Names        
Disposition        
Proceeds from sale of right to use trade name (included in total consideration) $ 1,000      
Time period following closing for buyer's right to use trade name 18 months