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SUBSEQUENT EVENTS: (Details) - Subsequent event - USD ($)
$ in Millions
Jul. 28, 2016
Aug. 04, 2016
Jul. 27, 2016
Subsequent Event      
Stock repurchase, share authorized $ 400   $ 300
Period in which shares can be repurchased in open market or privately negotiated transactions 18 months    
Acxiom Impact [Member] | Sale to Zeta Interactive      
Subsequent Event      
Total consideration received   $ 22