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Shareholders' Equity (Summary Of Options Outstanding And Aggregate Intrinsic Value) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Shareholders' Equity [Abstract]      
Options, Outstanding at beginning of year 14,192 16,601 [1] 21,582
Options, Granted 2,125 2,139 1,845
Options, Exercised (2,324) (4,062) (6,039)
Options, Forfeited (656)    
Options, Outstanding at December 31 13,337 14,192 16,601 [1]
Options, Exercisable at December 31 8,429 8,695 10,469
Aggregate intrinsic value, Outstanding at beginning of year $ 318,075    
Aggregate intrinsic value, Outstanding as of December 31 321,753 318,075  
Aggregate intrinsic value, Exercisable as of December 31 $ 239,032    
[1] As of December 31, 2011, approximately 13.2 million options were outstanding and expected to vest. Options expected to vest reflect an estimated forfeiture rate for purposes of determining related compensation expense.