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Employee Stock-Based Compensation and Benefit Plans (Schedule of Non-vested Stock Unit Activity) (Details) - Non-vested stock - $ / shares
1 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Jan. 31, 2016
Mar. 31, 2015
Dec. 31, 2017
Number of Shares          
Non-vested stock units at December 31, 2016 (in shares)         4,391,836
Granted (in shares)         3,155,701
Vested (in shares)         (2,259,454)
Forfeited (in shares)         (1,592,566)
Adjustment due to the Spin-Off of the GoTo Business (in shares)         927,029
Non-vested stock units at December 31, 2017 (in shares)         4,622,546
Weighted- Average Fair Value at Grant Date          
Non-vested stock units at December 31, 2016 (in dollars per share)         $ 70.67
Granted (in dollars per share) $ 104.05 $ 66.18 $ 49.68 $ 61.01 86.41
Vested (in dollars per share)         66.39
Forfeited (in dollars per share)         55.42
Adjustment due to the Spin-Off of the GoTo Business (in dollars per share)         5.57
Non-vested stock units at December 31, 2017 (in dollars per share)         $ 82.83