Stock Compensation Plans (Schedule Of Stock Option Activity) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Stock Compensation Plans [Abstract]
Shares Subject to Options, Outstanding, beginning of the year	2,274,627
Shares Subject to Options, Granted	383,275
Shares Subject to Options, Exercised	(683,132)
Shares Subject to Options, Forfeited or expired	(842,224)
Shares Subject to Options, Outstanding, end of the year	1,132,546
Shares Subject to Options, Exercisable, end of the year	628,325
Weighted Average Exercise Price, Outstanding, beginning of the year	$ 56.17
Weighted Average Exercise Price, Granted	$ 57.92
Weighted Average Exercise Price, Exercised	$ 50.22
Weighted Average Exercise Price, Forfeited or expired	$ 60.44
Weighted Average Exercise Price, Outstanding, end of the year	$ 57.17
Weighted Average Exercise Price, Exercisable, end of the year	$ 56.31
Weighted Average Remaining Contractual Life In Years, Outstanding, end of the year	6.8
Weighted Average Remaining Contractual Life In Years, Exercisable, end of the year	5.2
Aggregate Intrinsic Value, Outstanding, end of the year	$ 5,613
Aggregate Intrinsic Value, Exercisable, end of the year	$ 4,053