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Share-Based Compensation Arrangements (Stock Options Outstanding and Options Exercisable) (Details)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number of Share Options | shares 309,116
Options Outstanding, Weighted Average Remaining Life (Years) 6 years 5 days
Options Outstanding, Weighted Average Exercise Price $ 26.84
Options Exercisable, Number of Share Options | shares 189,791
Options Exercisable, Weighted Average Exercise Price $ 21.78
$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 53,132
Options Outstanding, Weighted Average Remaining Life (Years) 3 years 10 months 25 days
Options Outstanding, Weighted Average Exercise Price $ 17.61
Options Exercisable, Number of Share Options | shares 53,132
Options Exercisable, Weighted Average Exercise Price $ 17.61
$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
Options Outstanding, Number of Share Options | shares 138,870
Options Outstanding, Weighted Average Remaining Life (Years) 4 years 8 months
Options Outstanding, Weighted Average Exercise Price $ 23.14
Options Exercisable, Number of Share Options | shares 131,870
Options Exercisable, Weighted Average Exercise Price $ 23.05
$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
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
Options Outstanding, Number of Share Options | shares 70,214
Options Outstanding, Weighted Average Remaining Life (Years) 7 years 9 months 7 days
Options Outstanding, Weighted Average Exercise Price $ 32.76
Options Exercisable, Number of Share Options | shares 4,689
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
Options Outstanding, Number of Share Options | shares 46,900
Options Outstanding, Weighted Average Remaining Life (Years) 9 years 8 months 26 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