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Stock-Based Compensation (Summary of Stock Option Activity) (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
$ / shares
shares
Stock-Based Compensation [Abstract]  
Number of Shares, Outstanding at December 31, 2019 | shares 4,507
Number of Shares, Granted | shares 10
Number of Shares, Exercised | shares (813)
Number of Shares, Forfeited/canceled | shares (17)
Number of Shares,Outstanding at March 31, 2020 | shares 3,687
Number of Shares, Exercisable at March 31, 2020 | shares 2,155
Number of Shares, Unvested at March 31, 2020 | shares 1,532
Weighted-Average Exercise Price Per Share, Outstanding at December 31, 2019 | $ / shares $ 133.68
Weighted-Average Exercise Price Per Share, Granted | $ / shares 240.99
Weighted-Average Exercise Price Per Share, Exercised | $ / shares 104.80
Weighted-Average Exercise Price Per Share, Forfeited/canceled | $ / shares 172.71
Weighted-Average Exercise Price Per Share, Outstanding at March 31, 2020 | $ / shares 140.15
Weighted-Average Exercise Price Per Share, Exercisable at March 31, 2020 | $ / shares 123.52
Weighted-Average Exercise Price Per Share, Unvested at March 31, 2020 | $ / shares $ 163.53
Weighted-Average Remaining Contractual Life (in years), Outstanding at March 31, 2020 4 years 4 months 24 days
Weighted-Average Remaining Contractual Life (in years), Exercisable at March 31, 2020 3 years 8 months 12 days
Weighted-Average Remaining Contractual Life (in years), Unvested at March 31, 2020 5 years 3 months 18 days
Aggregate Intrinsic Value, Outstanding at March 31, 2020 | $ $ 478,738
Aggregate Intrinsic Value, Exercisable at March 31, 2020 | $ 315,601
Aggregate Intrinsic Value, Unvested at March 31, 2020 | $ $ 163,137