Share-Based Compensation Arrangements (Stock Options Outstanding and Options Exercisable) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	428,388
Options Outstanding, Weighted Average Remaining Life (Years)	5 years 11 months
Options Outstanding, Weighted Average Exercise Price	$ 24.50
Options Exercisable, Number	206,938
Options Exercisable, Weighted Average Exercise Price	$ 25.20
$16.39 to $19.66 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Ranges, Lower Range Limit	$ 16.36
Exercise Price Ranges, Upper Range Limit	$ 19.66
Options Outstanding, Number of Shares	65,282
Options Outstanding, Weighted Average Remaining Life (Years)	6 years
Options Outstanding, Weighted Average Exercise Price	$ 17.59
Options Exercisable, Number	44,282
Options Exercisable, Weighted Average Exercise Price	$ 17.44
$19.67 to $22.94 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Ranges, Lower Range Limit	$ 19.67
Exercise Price Ranges, Upper Range Limit	$ 22.94
Options Outstanding, Number of Shares	55,700
Options Outstanding, Weighted Average Remaining Life (Years)	7 years 3 months 22 days
Options Outstanding, Weighted Average Exercise Price	$ 21.71
Options Exercisable, Number	1,500
Options Exercisable, Weighted Average Exercise Price	$ 21.71
$22.95 to $26.22 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Ranges, Lower Range Limit	$ 22.95
Exercise Price Ranges, Upper Range Limit	$ 26.22
Options Outstanding, Number of Shares	159,192
Options Outstanding, Weighted Average Remaining Life (Years)	6 years 7 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 23.70
Options Exercisable, Number	67,542
Options Exercisable, Weighted Average Exercise Price	$ 24.12
$26.23 to $29.49 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Ranges, Lower Range Limit	$ 26.23
Exercise Price Ranges, Upper Range Limit	$ 29.49
Options Outstanding, Number of Shares	93,614
Options Outstanding, Weighted Average Remaining Life (Years)	1 year 7 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 27.50
Options Exercisable, Number	93,614
Options Exercisable, Weighted Average Exercise Price	$ 27.50
$29.50 to $32.77 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Ranges, Lower Range Limit	$ 29.50
Exercise Price Ranges, Upper Range Limit	$ 32.77
Options Outstanding, Number of Shares	54,600
Options Outstanding, Weighted Average Remaining Life (Years)	9 years 9 months 7 days
Options Outstanding, Weighted Average Exercise Price	$ 32.77
Options Exercisable, Number	0
Options Exercisable, Weighted Average Exercise Price	$ 0.00