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Share-Based Compensation Arrangements (Stock Options Outstanding and Options Exercisable) (Details)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number of Share Options | shares 223,853
Options Outstanding, Weighted Average Remaining Life (Years) 7 years 2 months 20 days
Options Outstanding, Weighted Average Exercise Price $ 38.68
Options Exercisable, Number of Share Options | shares 80,003
Options Exercisable, Weighted Average Exercise Price $ 25.89
$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 11,700
Options Outstanding, Weighted Average Remaining Life (Years) 1 year 10 months 15 days
Options Outstanding, Weighted Average Exercise Price $ 17.52
Options Exercisable, Number of Share Options | shares 11,700
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 38,593
Options Outstanding, Weighted Average Remaining Life (Years) 3 years 10 months 18 days
Options Outstanding, Weighted Average Exercise Price $ 23.14
Options Exercisable, Number of Share Options | shares 38,593
Options Exercisable, Weighted Average Exercise Price $ 23.14
$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 29,710
Options Outstanding, Weighted Average Remaining Life (Years) 6 years
Options Outstanding, Weighted Average Exercise Price $ 32.76
Options Exercisable, Number of Share Options | shares 29,710
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 46,000
Options Outstanding, Weighted Average Remaining Life (Years) 7 years 9 months 2 days
Options Outstanding, Weighted Average Exercise Price $ 39.39
Options Exercisable, Number of Share Options | shares 0
Options Exercisable, Weighted Average Exercise Price $ 0.00
$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 50,800
Options Outstanding, Weighted Average Remaining Life (Years) 8 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 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
$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 47,050
Options Outstanding, Weighted Average Remaining Life (Years) 9 years 9 months 18 days
Options Outstanding, Weighted Average Exercise Price $ 58.05
Options Exercisable, Number of Share Options | shares 0
Options Exercisable, Weighted Average Exercise Price $ 0