Stock Based Compensation And Other Incentive Plans (Schedule Of Stock Option Activity Under Incentive Plan) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Based Compensation And Other Incentive Plans [Abstract]
Options outstanding at January 1	4,544
Granted, Common Shares	728
Exercised, Common Shares	(199)	(155)	(13)
Cancelled, Common Shares	(88)
Expired, Common Shares	(32)
Options outstanding at December 31	4,953	4,544
Options exercisable at December 31	3,157
Options outstanding at January 1, Weighted Average Exercise Price	$ 25.18
Granted, Weighted Average Exercise Price	$ 32.18
Exercised, Weighted Average Exercise Price	$ 11.61
Cancelled, Weighted Average Exercise Price	$ 23.74
Expired, Weighted Average Exercise Price	$ 52.69
Options outstanding at December 31, Weighted Average Exercise Price	$ 26.60	$ 25.18
Options exercisable at December 31, Weighted Average Exercise Price	$ 27.59
Options outstanding at December 31, Aggregate Intrinsic Value	$ 4,107
Options exercisable at December 31, Aggregate Intrinsic Value	$ 3,887
Options outstanding at December 31, Average Contract Life	5.76
Options exercisable at December 31 , Average Contract Life	4.35