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Share-Based Compensation Arrangements (Stock Options Outstanding and Options Exercisable) (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number of Share Options | shares 222,615
Options Outstanding, Weighted Average Remaining Life (Years) 7 years 1 month 24 days
Options Outstanding, Weighted Average Exercise Price $ 42.92
Options Exercisable, Number of Share Options | shares 87,990
Options Exercisable, Weighted Average Exercise Price $ 31.18
$15.01 to $20.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Ranges, Lower Range Limit 15.01
Exercise Price Ranges, Upper Range Limit $ 20.00
Options Outstanding, Number of Share Options | shares 6,900
Options Outstanding, Weighted Average Remaining Life (Years) 1 year 5 months 1 day
Options Outstanding, Weighted Average Exercise Price $ 17.52
Options Exercisable, Number of Share Options | shares 6,900
Options Exercisable, Weighted Average Exercise Price $ 17.52
$20.01 to $25.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Ranges, Lower Range Limit 20.01
Exercise Price Ranges, Upper Range Limit $ 25.00
Options Outstanding, Number of Share Options | shares 26,040
Options Outstanding, Weighted Average Remaining Life (Years) 3 years 25 days
Options Outstanding, Weighted Average Exercise Price $ 23.06
Options Exercisable, Number of Share Options | shares 26,040
Options Exercisable, Weighted Average Exercise Price $ 23.06
$25.01 to $30.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Ranges, Lower Range Limit 25.01
Exercise Price Ranges, Upper Range Limit $ 30.00
Options Outstanding, Number of Share Options | shares 0
Options Outstanding, Weighted Average Remaining Life (Years) 0 years
Options Outstanding, Weighted Average Exercise Price $ 0.00
Options Exercisable, Number of Share Options | shares 0
Options Exercisable, Weighted Average Exercise Price $ 0.00
$30.01 to $35.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Ranges, Lower Range Limit 30.01
Exercise Price Ranges, Upper Range Limit $ 35.00
Options Outstanding, Number of Share Options | shares 22,875
Options Outstanding, Weighted Average Remaining Life (Years) 4 years 11 months 22 days
Options Outstanding, Weighted Average Exercise Price $ 32.76
Options Exercisable, Number of Share Options | shares 22,875
Options Exercisable, Weighted Average Exercise Price $ 32.76
$35.01 to $40.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Ranges, Lower Range Limit 35.01
Exercise Price Ranges, Upper Range Limit $ 40.00
Options Outstanding, Number of Share Options | shares 36,175
Options Outstanding, Weighted Average Remaining Life (Years) 6 years 5 months 20 days
Options Outstanding, Weighted Average Exercise Price $ 39.35
Options Exercisable, Number of Share Options | shares 32,175
Options Exercisable, Weighted Average Exercise Price $ 39.55
$40.01 to $45.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Ranges, Lower Range Limit 40.01
Exercise Price Ranges, Upper Range Limit $ 45.00
Options Outstanding, Number of Share Options | shares 42,850
Options Outstanding, Weighted Average Remaining Life (Years) 7 years 9 months 18 days
Options Outstanding, Weighted Average Exercise Price $ 40.25
Options Exercisable, Number of Share Options | shares 0
Options Exercisable, Weighted Average Exercise Price $ 0
$45.01 to $50.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Ranges, Lower Range Limit 45.01
Exercise Price Ranges, Upper Range Limit $ 50.00
Options Outstanding, Number of Share Options | shares 0
Options Outstanding, Weighted Average Remaining Life (Years) 0 years
Options Outstanding, Weighted Average Exercise Price $ 0.00
Options Exercisable, Number of Share Options | shares 0
Options Exercisable, Weighted Average Exercise Price $ 0
$50.01 to $55.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Ranges, Lower Range Limit 50.01
Exercise Price Ranges, Upper Range Limit $ 55.00
Options Outstanding, Number of Share Options | shares 47,950
Options Outstanding, Weighted Average Remaining Life (Years) 9 years 9 months 17 days
Options Outstanding, Weighted Average Exercise Price $ 54.74
Options Exercisable, Number of Share Options | shares 0
Options Exercisable, Weighted Average Exercise Price $ 0
$55.01 to $60.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Ranges, Lower Range Limit 55.01
Exercise Price Ranges, Upper Range Limit $ 60.00
Options Outstanding, Number of Share Options | shares 39,825
Options Outstanding, Weighted Average Remaining Life (Years) 8 years 9 months 17 days
Options Outstanding, Weighted Average Exercise Price $ 58.05
Options Exercisable, Number of Share Options | shares 0
Options Exercisable, Weighted Average Exercise Price $ 0