Stock-Based Compensation (Summary Of Stock Options Outstanding By Exercise Price Range) (Details) (USD $)	9 Months Ended
	Sep. 30, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding	600,140
Options Outstanding, Weighted Average Exercise Price	$ 18.79
Options Exercisable	600,140
Options Exercisable, Weighted Average Exercise Price Per Share	$ 18.79
Range Of Exercise Price, $6.60 - $6.60 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Exercise Price, Lower range limit	$ 6.60
Options Outstanding Exercise Price, Upper range limit	$ 6.60
Options Outstanding	451,923
Options Outstanding, Weighted Average Exercise Price	$ 6.60
Options Outstanding, Weighted Average Remaining Contractual Life	4 years 10 months 10 days
Options Exercisable	451,923
Options Exercisable, Weighted Average Exercise Price Per Share	$ 6.60
Range Of Exercise Price, $14.10 - $14.10 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Exercise Price, Lower range limit	$ 14.10
Options Outstanding Exercise Price, Upper range limit	$ 14.10
Options Outstanding	5,000
Options Outstanding, Weighted Average Exercise Price	$ 14.10
Options Outstanding, Weighted Average Remaining Contractual Life	7 years 9 months 29 days
Options Exercisable	5,000
Options Exercisable, Weighted Average Exercise Price Per Share	$ 14.10
Range Of Exercise Price, $28.90 - $28.90 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Exercise Price, Lower range limit	$ 28.90
Options Outstanding Exercise Price, Upper range limit	$ 28.90
Options Outstanding	50,625
Options Outstanding, Weighted Average Exercise Price	$ 28.90
Options Outstanding, Weighted Average Remaining Contractual Life	3 years 2 months 9 days
Options Exercisable	50,625
Options Exercisable, Weighted Average Exercise Price Per Share	$ 28.90
Range Of Exercise Price, $31.90 - $68.80 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Exercise Price, Lower range limit	$ 31.90
Options Outstanding Exercise Price, Upper range limit	$ 68.80
Options Outstanding	67,523
Options Outstanding, Weighted Average Exercise Price	$ 64.69
Options Outstanding, Weighted Average Remaining Contractual Life	1 year 29 days
Options Exercisable	67,523
Options Exercisable, Weighted Average Exercise Price Per Share	$ 64.69
Range Of Exercise Price, $80.30 - $96.70 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Exercise Price, Lower range limit	$ 80.30
Options Outstanding Exercise Price, Upper range limit	$ 96.70
Options Outstanding	22,569
Options Outstanding, Weighted Average Exercise Price	$ 94.29
Options Outstanding, Weighted Average Remaining Contractual Life	2 years 1 month 17 days
Options Exercisable	22,569
Options Exercisable, Weighted Average Exercise Price Per Share	$ 94.29
Range Of Exercise Price, $105.10 - $105.10 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Exercise Price, Lower range limit	$ 105.10
Options Outstanding Exercise Price, Upper range limit	$ 105.10
Options Outstanding	2,500
Options Outstanding, Weighted Average Exercise Price	$ 105.10
Options Outstanding, Weighted Average Remaining Contractual Life	1 year 10 months 2 days
Options Exercisable	2,500
Options Exercisable, Weighted Average Exercise Price Per Share	$ 105.10