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Stock-Based Compensation (Summary of Stock Option Activity) (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Stock-Based Compensation [Abstract]  
Number of Shares, Outstanding at December 31, 2018 | shares 4,816
Number of Shares, Granted | shares 1,068
Number of Shares, Exercised | shares (1,290)
Number of Shares, Forfeited/canceled | shares (56)
Number of Shares,Outstanding at September 30, 2019 | shares 4,538
Number of Shares, Exercisable at September 30, 2019 | shares 1,939
Number of Shares, Unvested at September 30, 2019 | shares 2,599
Weighted-Average Exercise Price Per Share, Outstanding at December 31, 2018 | $ / shares $ 114.48
Weighted-Average Exercise Price Per Share, Granted | $ / shares 183.41
Weighted-Average Exercise Price Per Share, Exercised | $ / shares 103.43
Weighted-Average Exercise Price Per Share, Forfeited/canceled | $ / shares 139.03
Weighted-Average Exercise Price Per Share, Outstanding at September 30, 2019 | $ / shares 133.55
Weighted-Average Exercise Price Per Share, Exercisable at September 30, 2019 | $ / shares 109.35
Weighted-Average Exercise Price Per Share, Unvested at September 30, 2019 | $ / shares $ 151.62
Weighted-Average Remaining Contractual Life (in years), Outstanding at September 30, 2019 4 years 4 months 24 days
Weighted-Average Remaining Contractual Life (in years), Exercisable at September 30, 2019 3 years
Weighted-Average Remaining Contractual Life (in years), Unvested at September 30, 2019 5 years 4 months 24 days
Aggregate Intrinsic Value, Outstanding at September 30, 2019 | $ $ 488,143
Aggregate Intrinsic Value, Exercisable at September 30, 2019 | $ 255,552
Aggregate Intrinsic Value, Unvested at September 30, 2019 | $ $ 232,591