Employee Benefit Plans (Schedule Of Stock Option Activity) (Details) (Stock Options [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Beginning Balance (in shares)	3,950
Number of Shares, Granted (in shares)	1,272
Number of Shares, Cancelled and expired (in shares)	(313)
Number of Shares, Exercised (in shares)	(472)
Number of Shares, Ending Balance (in shares)	4,437
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Options, Outstanding, Weighted Average Exercise Price, Beginning Balance (in dollars per share)	$ 27.03
Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 33.81
Options, Cancelled and expired, Weighted Average Exercise Price (in dollars per share)	$ 30.34
Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)	$ 22.79
Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)	$ 29.19