Stock-Based Compensation (Summary Of Outstanding And Exercisable Options) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number	2,556,114
Options Outstanding, Weighted average remaining contractual life in years	3 years 8 months 15 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 21.38
Options Exercisable, Number	1,951,914
Options Exercisable, Weighted average exercise price	$ 19.96
$8.60 to $8.75 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number	453,568
Options Outstanding, Weighted average remaining contractual life in years	1 year 3 months 25 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 8.61
Options Exercisable, Number	453,568
Options Exercisable, Weighted average exercise price	$ 8.61
Range of exercise prices, lower limit	$ 8.60
Range of exercise prices, upper limit	$ 8.75
$13.20 to $23.19 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number	26,500
Options Outstanding, Weighted average remaining contractual life in years	3 years 5 months 19 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 18.18
Options Exercisable, Number	22,500
Options Exercisable, Weighted average exercise price	$ 17.29
Range of exercise prices, lower limit	$ 13.20
Range of exercise prices, upper limit	$ 23.19
$23.45 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number	1,936,046
Options Outstanding, Weighted average remaining contractual life in years	4 years 0 months 3 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 23.45
Options Exercisable, Number	1,441,846
Options Exercisable, Weighted average exercise price	$ 23.45
$23.88 to $40.01 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number	140,000
Options Outstanding, Weighted average remaining contractual life in years	7 years 3 months 18 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 34.73
Options Exercisable, Number	34,000
Options Exercisable, Weighted average exercise price	$ 25.17
Range of exercise prices, lower limit	$ 23.88
Range of exercise prices, upper limit	$ 40.01