Share-Based Compensation (Summary Of Information Concerning Stock Options Outstanding Including Related Transactions Under The Stock Option Plans) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Share-Based Compensation [Abstract]
Options Outstanding as of December 31, 2011, Number of Shares	65,027
Granted, Number of Shares	7,701
Exercised, Number of Shares	(4,364)
Forfeited and Expired, Number of Shares	(1,404)
Options Outstanding as of September 30, 2012, Number of Shares	66,960
Options Exercisable as of September 30, 2012, Number of Shares	53,747
Options Outstanding as of December 31, 2011, Weighted-Average Exercise Price	$ 15.91
Granted, Weighted-Average Exercise Price	$ 12.98
Exercised, Weighted-Average Exercise Price	$ 6.07
Forfeited and Expired, Weighted-Average Exercise Price	$ 17.85
Options Outstanding as of September 30, 2012, Weighted-Average Exercise Price	$ 16.18
Options Exercisable as of September 30, 2012, Weighted-Average Exercise Price	$ 16.21
Options Outstanding as of September 30, 2012, Weighted-Average Remaining Contractual Term in Years	4 years 10 months 21 days
Options Exercisable as of September 30, 2012, Weighted-Average Remaining Contractual Term in Years	3 years 11 months 16 days
Options Outstanding as of September 30, 2012, Aggregate Intrinsic Value	$ 92,589
Options Exercisable as of September 30, 2012, Aggregate Intrinsic Value	$ 92,260