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Share-Based Compensation Share-Based Compensation Price Ranges (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding Stock Options (in shares) | shares 1,879,151
Outstanding Stock Options Weighted Average Remaining Contractual Term (in years) 3 years 9 months 4 days
Outstanding Stock Options Weighted Average Exercise Price (in dollars per share) $ 48.19
Exercisable Stock Options (in shares) | shares 1,358,874
Exercisable Stock Options, Weighted Average Exercise Price (in dollars per share) $ 31.52
Exercise Price Range 18.44 to 24.50 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding Stock Options (in shares) | shares 817,077
Outstanding Stock Options Weighted Average Remaining Contractual Term (in years) 1 year 3 months 30 days
Outstanding Stock Options Weighted Average Exercise Price (in dollars per share) $ 21.42
Exercisable Stock Options (in shares) | shares 817,077
Exercisable Stock Options, Weighted Average Exercise Price (in dollars per share) $ 21.42
Exercise price range per share, lower range (in dollars per share) 18.44
Exercise price range per share, upper range (in dollars per share) $ 24.50
Exercise Price Range 24.51 to 69.85 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding Stock Options (in shares) | shares 719,599
Outstanding Stock Options Weighted Average Remaining Contractual Term (in years) 4 years 6 months 5 days
Outstanding Stock Options Weighted Average Exercise Price (in dollars per share) $ 51.06
Exercisable Stock Options (in shares) | shares 541,797
Exercisable Stock Options, Weighted Average Exercise Price (in dollars per share) $ 46.75
Exercise price range per share, lower range (in dollars per share) 24.51
Exercise price range per share, upper range (in dollars per share) $ 69.85
Exercise Price Range 69.86 to 138.11 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding Stock Options (in shares) | shares 342,475
Outstanding Stock Options Weighted Average Remaining Contractual Term (in years) 7 years 11 months 15 days
Outstanding Stock Options Weighted Average Exercise Price (in dollars per share) $ 106.05
Exercisable Stock Options (in shares) | shares 0
Exercisable Stock Options, Weighted Average Exercise Price (in dollars per share) $ 0.00
Exercise price range per share, lower range (in dollars per share) 69.86
Exercise price range per share, upper range (in dollars per share) $ 138.11