Employee Benefit Plans (Schedule Of Stock Option Activity) (Details) (Stock Options [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Beginning Balance (in shares)	4,324
Number of Shares, Options Granted (in shares)	138
Number of Shares, Options Exercised (in shares)	(108)
Number of Shares, Options Cancelled and expired (in shares)	(59)
Number of Shares, Ending Balance (in shares)	4,295
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)	$ 29.29
Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 36.80
Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)	$ 23.64
Options, Cancelled and expired, Weighted Average Exercise Price (in dollars per share)	$ 33.54
Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)	$ 29.62