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Stockholders' Equity (Summary of Activity Related to Stock Option Plans) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Shares Available for Grant, Beginning Balances 8,699,941 10,739,915 13,289,953
Options Outstanding, Number of Shares, Beginning Balances 20,479,278 21,647,350 22,437,347
Options Outstanding, Number of Shares, Granted 2,588,380 2,039,974 2,550,038
Options Outstanding, Number of Shares, Exercised (2,208,052) (3,205,911) (3,338,474)
Options Outstanding, Number of Shares, Expired (280) (2,135) (1,561)
Shares Available for Grant, Ending Balances 6,111,561 8,699,941 10,739,915
Options Outstanding, Number of Shares, Ending Balances 20,859,326 20,479,278 21,647,350
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Options Outstanding, Weighted-Average Exercise Price, Beginning Balances (in USD per share) $ 89.61 $ 61.13 $ 44.83
Options Outstanding, Weighted-Average Exercise Price, Granted (in USD per share) 320.66 311.66 159.56
Options Outstanding, Weighted-Average Exercise Price, Exercised (in USD per share) 32.88 38.66 26.79
Options Outstanding, Weighted-Average Exercise Price, Expired (in USD per share) 6.74 4.60 3.25
Options Outstanding, Weighted-Average Exercise Price, Ending Balances (in USD per share) $ 124.28 $ 89.61 $ 61.13
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Options Outstanding, Number of Shares, Vested and exercisable 20,859,326    
Options Outstanding, Weighted-Average Exercise Price, Vested and exercisable (in USD per share) $ 124.28    
Weighted-Average Remaining Contractual Term, Vested and exercisable 5 years 6 months 25 days    
Aggregate Intrinsic Value, Vested and exercisable $ 4,230,013