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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	NOTE 19—SUBSEQUENT EVENTS In January 2018, the Company acquired The Future Customer, a leading boutique loyalty strategy and marketing company based in London. The acquisition was immaterial to the financial statements taken as a whole. On February 27, 2018, the Company’s board of directors approved a $0.14 per share cash dividend. The dividend will be paid on April 16, 2018 to shareholders of record as of the close of business on March 30, 2018.