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	6 Months Ended
	Jun. 30, 2012
Share-Based Compensation [Abstract]
Options Outstanding as of December 31, 2011, Number of Shares	65,027
Granted, Number of Shares	7,623
Exercised, Number of Shares	(2,839)
Forfeited and Expired, Number of Shares	(1,162)
Options Outstanding as of June 30, 2012, Number of Shares	68,649
Options Exercisable as of June 30, 2012, Number of Shares	55,406
Options Outstanding as of December 31, 2011, Weighted-Average Exercise Price	$ 15.91
Granted, Weighted-Average Exercise Price	$ 12.99
Exercised, Weighted-Average Exercise Price	$ 6.76
Forfeited and Expired, Weighted-Average Exercise Price	$ 18.07
Options Outstanding as of June 30, 2012, Weighted-Average Exercise Price	$ 15.93
Options Exercisable as of June 30, 2012, Weighted-Average Exercise Price	$ 15.89
Options Outstanding as of June 30, 2012, Weighted-Average Remaining Contractual Term in Years	5 years 18 days
Options Exercisable as of June 30, 2012, Weighted-Average Remaining Contractual Term in Years	4 years 1 month 13 days
Options Outstanding as of June 30, 2012, Aggregate Intrinsic Value	$ 94,692
Options Exercisable as of June 30, 2012, Aggregate Intrinsic Value	$ 94,459