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Share-Based Compensation - Option Summary (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Number of Outstanding Options, Exercise Price Range | shares 122,072
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 5 years
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 116.39
Number of Exercisable Options, Exercise Price Range | shares 35,437
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range $ 94.17
$50.01 - $60.00  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit 50.01
Exercise Price Range, Upper Range Limit $ 60
Number of Outstanding Options, Exercise Price Range | shares 874
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 1 year 2 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 58.26
Number of Exercisable Options, Exercise Price Range | shares 874
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range $ 58.26
$60.01 - $70.00  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit 60.01
Exercise Price Range, Upper Range Limit $ 70
Number of Outstanding Options, Exercise Price Range | shares 0
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 0 years
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 0
Number of Exercisable Options, Exercise Price Range | shares 0
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range $ 0
$70.01 - $80.00  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit 70.01
Exercise Price Range, Upper Range Limit $ 80
Number of Outstanding Options, Exercise Price Range | shares 42,272
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 4 years 1 month
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 72.19
Number of Exercisable Options, Exercise Price Range | shares 19,791
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range $ 72.26
$80.01 - $90.00  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit 80.01
Exercise Price Range, Upper Range Limit $ 90
Number of Outstanding Options, Exercise Price Range | shares 2,797
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 3 years 2 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 87.3
Number of Exercisable Options, Exercise Price Range | shares 2,797
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range $ 87.3
$90.01 - $130.00  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit 90.01
Exercise Price Range, Upper Range Limit $ 130
Number of Outstanding Options, Exercise Price Range | shares 0
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 0 years
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 0
Number of Exercisable Options, Exercise Price Range | shares 0
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range $ 0
$130.01 - $140.00  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit 130.01
Exercise Price Range, Upper Range Limit $ 140
Number of Outstanding Options, Exercise Price Range | shares 40,287
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 5 years 2 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 134.6
Number of Exercisable Options, Exercise Price Range | shares 11,975
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range $ 134.6
$140.01 - $150.00  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit 140.01
Exercise Price Range, Upper Range Limit $ 150
Number of Outstanding Options, Exercise Price Range | shares 0
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 0 years
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 0
Number of Exercisable Options, Exercise Price Range | shares 0
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range $ 0
$150.01 - $160.00  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit 150.01
Exercise Price Range, Upper Range Limit $ 160
Number of Outstanding Options, Exercise Price Range | shares 35,842
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 6 years 2 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 151.75
Number of Exercisable Options, Exercise Price Range | shares 0
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range $ 0