Employee Benefit Plans (Schedule Of Ranges Of Outstanding And Exercisable Stock Options) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Shares Outstanding	4,324
Options Outstanding, Weighted-Average Remaining Contractual Life	7 years 4 months 24 days
Options outstanding, Weighted-Average Exercise Price Per Share	$ 29.29
Options Exercisable, Shares Exercisable	2,100
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 25.94
0.00 - 10.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Shares Outstanding	1
Options Outstanding, Weighted-Average Remaining Contractual Life	1 year 6 months 22 days
Options outstanding, Weighted-Average Exercise Price Per Share	$ 9.26
Options Exercisable, Shares Exercisable	1
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 9.26
Range of Exercise Prices, Lower range (in dollars per share)	$ 0.00
Range of Exercies Prices, Upper range (in dollars per share)	$ 10.00
10.01 - 20.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Shares Outstanding	489
Options Outstanding, Weighted-Average Remaining Contractual Life	5 years 2 months 19 days
Options outstanding, Weighted-Average Exercise Price Per Share	$ 13.45
Options Exercisable, Shares Exercisable	466
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 13.42
Range of Exercise Prices, Lower range (in dollars per share)	$ 10.01
Range of Exercies Prices, Upper range (in dollars per share)	$ 20.00
20.01 - 30.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Shares Outstanding	1,262
Options Outstanding, Weighted-Average Remaining Contractual Life	6 years 0 months 15 days
Options outstanding, Weighted-Average Exercise Price Per Share	$ 24.82
Options Exercisable, Shares Exercisable	935
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 25.31
Range of Exercise Prices, Lower range (in dollars per share)	$ 20.01
Range of Exercies Prices, Upper range (in dollars per share)	$ 30.00
30.01 - 40.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Shares Outstanding	2,463
Options Outstanding, Weighted-Average Remaining Contractual Life	8 years 5 months 16 days
Options outstanding, Weighted-Average Exercise Price Per Share	$ 34.26
Options Exercisable, Shares Exercisable	680
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 35.01
Range of Exercise Prices, Lower range (in dollars per share)	$ 30.01
Range of Exercies Prices, Upper range (in dollars per share)	$ 40.00
40.01 - 50.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Shares Outstanding	109
Options Outstanding, Weighted-Average Remaining Contractual Life	9 years 1 month 2 days
Options outstanding, Weighted-Average Exercise Price Per Share	$ 40.01
Options Exercisable, Shares Exercisable	18
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 40.01
Range of Exercise Prices, Lower range (in dollars per share)	$ 40.01
Range of Exercies Prices, Upper range (in dollars per share)	$ 50.00