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Share-Based Compensation Arrangements (Stock Options Outstanding and Options Exercisable) (Details)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number of Share Options | shares 219,279
Options Outstanding, Weighted Average Remaining Life (Years) 7 years 2 months
Options Outstanding, Weighted Average Exercise Price $ 32.70
Options Exercisable, Number of Share Options | shares 89,954
Options Exercisable, Weighted Average Exercise Price $ 25.34
$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 13,200
Options Outstanding, Weighted Average Remaining Life (Years) 2 years 11 months 4 days
Options Outstanding, Weighted Average Exercise Price $ 17.52
Options Exercisable, Number of Share Options | shares 13,200
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 54,090
Options Outstanding, Weighted Average Remaining Life (Years) 4 years 6 months 6 days
Options Outstanding, Weighted Average Exercise Price $ 23.08
Options Exercisable, Number of Share Options | shares 47,090
Options Exercisable, Weighted Average Exercise Price $ 22.84
$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 51,689
Options Outstanding, Weighted Average Remaining Life (Years) 6 years 10 months 26 days
Options Outstanding, Weighted Average Exercise Price $ 32.76
Options Exercisable, Number of Share Options | shares 29,564
Options Exercisable, Weighted Average Exercise Price $ 32.77
$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 46,900
Options Outstanding, Weighted Average Remaining Life (Years) 8 years 8 months 28 days
Options Outstanding, Weighted Average Exercise Price $ 39.39
Options Exercisable, Number of Share Options | shares 100
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 53,400
Options Outstanding, Weighted Average Remaining Life (Years) 9 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