Stock Option And Incentive Plan And Stock Purchase Plan (Schedule Of Stock Options Outstanding) (Details) (USD $)					12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2011 Exercise Price Of $32.62 - $34.14 [Member] years	Dec. 31, 2011 Exercise Price Of $92.71 [Member] years
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower					$ 32.62
Range of Exercise Prices, upper					$ 34.14
Exercise Price						$ 92.71
Number Outstanding at 12/31/11	155,623	324,938	963,895	1,206,402	8,779	146,844
Weighted-Average Remaining Contractual Life (Years)					0.1	9.1
Outstanding, Weighted-Average Exercise Price	$ 89.35	$ 32.65	$ 34.44	$ 34.23	$ 33.10	$ 92.71
Number Exercisable at 12/31/11		324,938	963,895		8,779	4,854
Exercisable, Weighted-Average Exercise Price		$ 32.65	$ 34.44		$ 33.10	$ 92.71