Shareholders' Equity (Summary Of Outstanding Stock Options Issued Under All Plans) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding	1,850	2,151	2,067	1,763
Weighted Avg Remaining Contractual Life	5 years
Options Outstanding, Weighted Avg. Exercise Price	$ 15.37	$ 14.48	$ 14.82	$ 15.05
Options Exercisable	1,263	1,334	1,217
Options Exercisable, Weighted Avg. Exercise Price	$ 17.11	$ 16.13	$ 16.65
$4.58 To $11.59 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Range of Exercise Prices, minimum	$ 4.58
Options Outstanding, Range of Exercise Prices, maximum	$ 11.59
Options Outstanding	592
Weighted Avg Remaining Contractual Life	6 years 8 months 12 days
Options Outstanding, Weighted Avg. Exercise Price	$ 10.52
Options Exercisable	274
Options Exercisable, Weighted Avg. Exercise Price	$ 10.31
$11.89 To $15.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Range of Exercise Prices, minimum	$ 11.89
Options Outstanding, Range of Exercise Prices, maximum	$ 15.50
Options Outstanding	681
Weighted Avg Remaining Contractual Life	6 years 3 months 18 days
Options Outstanding, Weighted Avg. Exercise Price	$ 13.62
Options Exercisable	412
Options Exercisable, Weighted Avg. Exercise Price	$ 14.20
$16.93 To $24.71 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Range of Exercise Prices, minimum	$ 16.93
Options Outstanding, Range of Exercise Prices, maximum	$ 24.71
Options Outstanding	502
Weighted Avg Remaining Contractual Life	1 year 4 months 24 days
Options Outstanding, Weighted Avg. Exercise Price	$ 21.74
Options Exercisable	502
Options Exercisable, Weighted Avg. Exercise Price	$ 21.74
$26.12 To $28.43 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Range of Exercise Prices, minimum	$ 26.12
Options Outstanding, Range of Exercise Prices, maximum	$ 28.43
Options Outstanding	75
Weighted Avg Remaining Contractual Life	3 years 9 months 18 days
Options Outstanding, Weighted Avg. Exercise Price	$ 26.89
Options Exercisable	75
Options Exercisable, Weighted Avg. Exercise Price	$ 26.89