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Stock-Based Compensation - Exercise Prices for Stock Options (Details) - Employee And Non Employee Stock Option
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Exercise prices for stock options outstanding and exercisable:  
Number of stock options outstanding (in shares) | shares 5,013,038
Options outstanding, Weighted-average remaining contractual term 5 years
Options outstanding, Weighted-average exercise price (in dollars per share) $ 41.80
Number of stock options exercisable (in shares) | shares 3,710,138
Options exercisable, Weighted-average remaining contractual life 4 years
Options exercisable, Weighted-average exercise price (in dollars per share) $ 38.59
Range of Exercise Prices $0.00 - $20.00  
Exercise prices for stock options outstanding and exercisable:  
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) 0.00
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) $ 20.00
Number of stock options outstanding (in shares) | shares 51,359
Options outstanding, Weighted-average remaining contractual term 2 years
Options outstanding, Weighted-average exercise price (in dollars per share) $ 18.74
Number of stock options exercisable (in shares) | shares 51,359
Options exercisable, Weighted-average remaining contractual life 2 years
Options exercisable, Weighted-average exercise price (in dollars per share) $ 18.74
Range of Exercise Prices $20.01 - $25.00  
Exercise prices for stock options outstanding and exercisable:  
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) 20.01
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) $ 25.00
Number of stock options outstanding (in shares) | shares 429,306
Options outstanding, Weighted-average remaining contractual term 1 year
Options outstanding, Weighted-average exercise price (in dollars per share) $ 20.18
Number of stock options exercisable (in shares) | shares 429,306
Options exercisable, Weighted-average remaining contractual life 1 year
Options exercisable, Weighted-average exercise price (in dollars per share) $ 20.18
Range of Exercise Prices $25.01 - $30.00  
Exercise prices for stock options outstanding and exercisable:  
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) 25.01
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) $ 30.00
Number of stock options outstanding (in shares) | shares 3,300
Options outstanding, Weighted-average remaining contractual term 3 years
Options outstanding, Weighted-average exercise price (in dollars per share) $ 26.42
Number of stock options exercisable (in shares) | shares 3,300
Options exercisable, Weighted-average remaining contractual life 3 years
Options exercisable, Weighted-average exercise price (in dollars per share) $ 26.42
Range of Exercise Prices $30.01 - $35.00  
Exercise prices for stock options outstanding and exercisable:  
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) 30.01
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) $ 35.00
Number of stock options outstanding (in shares) | shares 352,500
Options outstanding, Weighted-average remaining contractual term 4 years
Options outstanding, Weighted-average exercise price (in dollars per share) $ 34.22
Number of stock options exercisable (in shares) | shares 352,500
Options exercisable, Weighted-average remaining contractual life 4 years
Options exercisable, Weighted-average exercise price (in dollars per share) $ 34.22
Range of Exercise Prices $35.01 - $40.00  
Exercise prices for stock options outstanding and exercisable:  
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) 35.01
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) $ 40.00
Number of stock options outstanding (in shares) | shares 1,985,200
Options outstanding, Weighted-average remaining contractual term 4 years
Options outstanding, Weighted-average exercise price (in dollars per share) $ 38.19
Number of stock options exercisable (in shares) | shares 1,832,500
Options exercisable, Weighted-average remaining contractual life 3 years
Options exercisable, Weighted-average exercise price (in dollars per share) $ 38.09
Range of Exercise Prices $40.01 to $45.00  
Exercise prices for stock options outstanding and exercisable:  
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) 40.01
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) $ 45.00
Number of stock options outstanding (in shares) | shares 277,000
Options outstanding, Weighted-average remaining contractual term 7 years
Options outstanding, Weighted-average exercise price (in dollars per share) $ 43.98
Number of stock options exercisable (in shares) | shares 111,400
Options exercisable, Weighted-average remaining contractual life 7 years
Options exercisable, Weighted-average exercise price (in dollars per share) $ 44.04
Range of Exercise Prices $45.01 to $50.00  
Exercise prices for stock options outstanding and exercisable:  
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) 45.01
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) $ 50.00
Number of stock options outstanding (in shares) | shares 766,973
Options outstanding, Weighted-average remaining contractual term 6 years
Options outstanding, Weighted-average exercise price (in dollars per share) $ 47.58
Number of stock options exercisable (in shares) | shares 577,473
Options exercisable, Weighted-average remaining contractual life 5 years
Options exercisable, Weighted-average exercise price (in dollars per share) $ 47.64
Range of Exercise Prices $50.01 and above  
Exercise prices for stock options outstanding and exercisable:  
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) 50.01
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) $ 55.00
Number of stock options outstanding (in shares) | shares 487,400
Options outstanding, Weighted-average remaining contractual term 7 years
Options outstanding, Weighted-average exercise price (in dollars per share) $ 52.24
Number of stock options exercisable (in shares) | shares 197,300
Options exercisable, Weighted-average remaining contractual life 6 years
Options exercisable, Weighted-average exercise price (in dollars per share) $ 51.99
Range Of Exercise Prices From Dollars 55.01 To 60.00  
Exercise prices for stock options outstanding and exercisable:  
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) 55.01
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) $ 60.00
Number of stock options outstanding (in shares) | shares 600,000
Options outstanding, Weighted-average remaining contractual term 8 years
Options outstanding, Weighted-average exercise price (in dollars per share) $ 56.97
Number of stock options exercisable (in shares) | shares 127,000
Options exercisable, Weighted-average remaining contractual life 8 years
Options exercisable, Weighted-average exercise price (in dollars per share) $ 56.95
Range Of Exercise Prices From Dollars 60.01 And Above  
Exercise prices for stock options outstanding and exercisable:  
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) $ 60.01
Number of stock options outstanding (in shares) | shares 60,000
Options outstanding, Weighted-average remaining contractual term 7 years
Options outstanding, Weighted-average exercise price (in dollars per share) $ 60.70
Number of stock options exercisable (in shares) | shares 28,000
Options exercisable, Weighted-average remaining contractual life 5 years
Options exercisable, Weighted-average exercise price (in dollars per share) $ 60.70