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Share-Based Compensation - Option Summary (Details)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Number of Outstanding Options, Exercise Price Range | shares 111,255
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 5 years 4 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 97.71
Number of Exercisable Options, Exercise Price Range | shares 11,771
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range $ 72.95
$30.01 - $40.00  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit 30.01
Exercise Price Range, Upper Range Limit $ 40
Number of Outstanding Options, Exercise Price Range | shares 552
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 1 year 2 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 38.13
Number of Exercisable Options, Exercise Price Range | shares 552
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range $ 38.13
$40.01 - $50.00  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit 40.01
Exercise Price Range, Upper Range Limit $ 50
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
$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 2 years 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 7,984
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 52,946
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 5 years
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 72.21
Number of Exercisable Options, Exercise Price Range | shares 2,361
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range $ 72.72
$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 14,406
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 4 years 2 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 87.3
Number of Exercisable Options, Exercise Price Range | shares 0
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 42,477
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 6 years 2 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 134.6
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range $ 0