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Common Stock, Preferred Stock and Equity Plans - Stock Options Outstanding and Exercisable (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Stock options outstanding and exercisable  
Options outstanding (in shares) | shares 9,767
Options outstanding, weighted-average remaining contractual life 6 years 11 months 12 days
Options outstanding, weighted-average exercise price (usd per share) $ 91.57
Options exercisable (in shares) | shares 5,313
Options exercisable, weighted-average exercise price (usd per share) $ 80.14
$18.93–$20.00  
Stock options outstanding and exercisable  
Exercise price, low end of range (usd per share) 18.93
Exercise price, high end of range (usd per share) $ 20.00
Options outstanding (in shares) | shares 128
Options outstanding, weighted-average remaining contractual life 1 month 6 days
Options outstanding, weighted-average exercise price (usd per share) $ 18.93
Options exercisable (in shares) | shares 128
Options exercisable, weighted-average exercise price (usd per share) $ 18.93
$20.01–$40.00  
Stock options outstanding and exercisable  
Exercise price, low end of range (usd per share) 20.01
Exercise price, high end of range (usd per share) $ 40
Options outstanding (in shares) | shares 810
Options outstanding, weighted-average remaining contractual life 1 year 10 months 17 days
Options outstanding, weighted-average exercise price (usd per share) $ 34.43
Options exercisable (in shares) | shares 810
Options exercisable, weighted-average exercise price (usd per share) $ 34.43
$40.01–$60.00  
Stock options outstanding and exercisable  
Exercise price, low end of range (usd per share) 40.01
Exercise price, high end of range (usd per share) $ 60
Options outstanding (in shares) | shares 798
Options outstanding, weighted-average remaining contractual life 4 years 5 months 27 days
Options outstanding, weighted-average exercise price (usd per share) $ 49.15
Options exercisable (in shares) | shares 798
Options exercisable, weighted-average exercise price (usd per share) $ 49.15
$60.01–$80.00  
Stock options outstanding and exercisable  
Exercise price, low end of range (usd per share) 60.01
Exercise price, high end of range (usd per share) $ 80
Options outstanding (in shares) | shares 746
Options outstanding, weighted-average remaining contractual life 6 years 2 months 9 days
Options outstanding, weighted-average exercise price (usd per share) $ 75.49
Options exercisable (in shares) | shares 653
Options exercisable, weighted-average exercise price (usd per share) $ 75.40
$80.01–$100.00  
Stock options outstanding and exercisable  
Exercise price, low end of range (usd per share) 80.01
Exercise price, high end of range (usd per share) $ 100
Options outstanding (in shares) | shares 4,350
Options outstanding, weighted-average remaining contractual life 8 years 26 days
Options outstanding, weighted-average exercise price (usd per share) $ 89.31
Options exercisable (in shares) | shares 1,514
Options exercisable, weighted-average exercise price (usd per share) $ 89.51
$100.01–$120.00  
Stock options outstanding and exercisable  
Exercise price, low end of range (usd per share) 100.01
Exercise price, high end of range (usd per share) $ 120.00
Options outstanding (in shares) | shares 1,087
Options outstanding, weighted-average remaining contractual life 7 years 1 month 10 days
Options outstanding, weighted-average exercise price (usd per share) $ 109.34
Options exercisable (in shares) | shares 633
Options exercisable, weighted-average exercise price (usd per share) $ 109.24
$120.01–$140.00  
Stock options outstanding and exercisable  
Exercise price, low end of range (usd per share) 120.01
Exercise price, high end of range (usd per share) $ 140.00
Options outstanding (in shares) | shares 1,223
Options outstanding, weighted-average remaining contractual life 7 years 7 months 17 days
Options outstanding, weighted-average exercise price (usd per share) $ 130.20
Options exercisable (in shares) | shares 734
Options exercisable, weighted-average exercise price (usd per share) $ 129.89
$140.01–$160.00  
Stock options outstanding and exercisable  
Exercise price, low end of range (usd per share) 140.01
Exercise price, high end of range (usd per share) $ 160.00
Options outstanding (in shares) | shares 0
Options outstanding, weighted-average exercise price (usd per share) $ 0.00
Options exercisable (in shares) | shares 0
Options exercisable, weighted-average exercise price (usd per share) $ 0.00
$160.01–$163.74  
Stock options outstanding and exercisable  
Exercise price, low end of range (usd per share) 160.01
Exercise price, high end of range (usd per share) $ 163.74
Options outstanding (in shares) | shares 625
Options outstanding, weighted-average remaining contractual life 9 years 6 months 15 days
Options outstanding, weighted-average exercise price (usd per share) $ 162.94
Options exercisable (in shares) | shares 43
Options exercisable, weighted-average exercise price (usd per share) $ 162.94