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Share-Based Compensation - Weighted-Average Assumptions and Resulting Grant Date Fair Value (Details) - Employee Stock Option [Member] - $ / shares
shares in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]    
Shares underlying options granted (in shares) 1,009 880
Weighted-average grant date fair value (in dollars per share) $ 40.17 $ 57.49
Weighted-average volatility 39.00% 39.00%
Weighted-average expected term (years) 4 years 2 months 4 years 2 months
Range of risk-free rates, minimum 1.00% 1.10%
Range of risk-free rates, maximum 1.50% 1.30%
Expected dividend yield 0.00% 0.00%