Share-Based Compensation Plan (Stock Options Outstanding Per Range of Exercise Prices) (Details) (Stock Options [Member], USD $)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding	1,073,990
Options Outstanding, Weighted Average Exercise Price Per Share	$ 26.84
Options Outstanding, Weighted Average Contractual Term	5 years 8 months 5 days
Options Exercisable, Weighted Average Exercise Price Per Share	$ 28.45
Options Exercisable, Weighted Average Contractual Term	3 years 9 months 18 days
Minimum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price per share, lower price range limit	$ 19.43
Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price per share, upper price range limit	$ 39.69
Range of Exercise Prices Per Share, $19.43 - 21.10 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding	122,253
Options Outstanding, Weighted Average Exercise Price Per Share	$ 20.37
Options Outstanding, Weighted Average Contractual Term	6 years 6 months 22 days
Options Exercisable, Number Exercisable	91,525
Options Exercisable, Weighted Average Exercise Price Per Share	$ 20.51
Options Exercisable, Weighted Average Contractual Term	6 years 3 months 22 days
Range of Exercise Prices Per Share, $19.43 - 21.10 [Member] | Minimum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price per share, lower price range limit	$ 19.43
Range of Exercise Prices Per Share, $19.43 - 21.10 [Member] | Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price per share, upper price range limit	$ 21.10
Range of Exercise Prices Per Share, $23.78 - 25.14 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding	692,450
Options Outstanding, Weighted Average Exercise Price Per Share	$ 24.57
Options Outstanding, Weighted Average Contractual Term	7 years 1 month 10 days
Options Exercisable, Number Exercisable	309,098
Options Exercisable, Weighted Average Exercise Price Per Share	$ 24.50
Options Exercisable, Weighted Average Contractual Term	5 years 0 months 4 days
Range of Exercise Prices Per Share, $23.78 - 25.14 [Member] | Minimum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price per share, lower price range limit	$ 23.78
Range of Exercise Prices Per Share, $23.78 - 25.14 [Member] | Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price per share, upper price range limit	$ 25.14
Range of Exercise Prices Per Share, $32.28 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding	130,400
Options Outstanding, Weighted Average Exercise Price Per Share	$ 32.28
Options Outstanding, Weighted Average Contractual Term	1 year 11 months 19 days
Options Exercisable, Number Exercisable	130,400
Options Exercisable, Weighted Average Exercise Price Per Share	$ 32.28
Options Exercisable, Weighted Average Contractual Term	1 year 11 months 19 days
Range of Exercise Prices Per Share, $32.28 [Member] | Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price per share, upper price range limit	$ 32.28
Range of Exercise Prices Per Share, $39.69 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding	128,887
Options Outstanding, Weighted Average Exercise Price Per Share	$ 39.69
Options Outstanding, Weighted Average Contractual Term	11 months 12 days
Options Exercisable, Number Exercisable	128,887
Options Exercisable, Weighted Average Exercise Price Per Share	$ 39.69
Options Exercisable, Weighted Average Contractual Term	11 months 12 days
Range of Exercise Prices Per Share, $39.69 [Member] | Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price per share, upper price range limit	$ 39.69