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	12 Months Ended
	Dec. 31, 2012
Share-Based Compensation [Abstract]
Options outstanding as of December 31, 2011	65,027
Granted, Number of shares	7,734
Exercised, Number of shares	(6,887)
Forfeited and expired, Number of shares	(1,813)
Options outstanding as of December 31, 2012	64,061
Options expected to vest as of December 31, 2012	63,873
Options exercisable as of December 31, 2012	51,553
Options outstanding, Weighted-average exercise price	$ 15.91
Granted, Weighted-average exercise price	$ 12.98
Exercised, Weighted-average exercise price	$ 5.60
Forfeited and expired, Weighted-average exercise Price	$ 17.20
Options outstanding, Weighted-average exercise price	$ 16.63
Options expected to vest, Weighted-average exercise price	$ 16.64
Options exercisable, Weighted-average exercise price	$ 16.79
Options outstanding, Weighted-average remaining contractual term	4 years 9 months 29 days
Options expected to vest, Weighted-average remaining contractual term	4 years 9 months 29 days
Options exercisable, Weighted-average remaining contractual term	3 years 11 months 9 days
Options outstanding, Aggregate intrinsic value	$ 65,024
Options expected to vest, Aggregate intrinsic value	65,018
Options exercisable, Aggregate intrinsic value	$ 64,838