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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Earnings Per Share [Abstract]      
Net income $ 543,966 $ 452,826 $ 357,523
Weighted average Ordinary shares outstanding (in thousands) 206,917 208,106 209,371
Employee stock options and RSUs (in thousands) 7,005 4,827 2,837
Diluted weighted average Ordinary shares outstanding (in thousands) 213,922 212,933 212,208
Basic earnings per Ordinary share $ 2.63 $ 2.18 $ 1.71
Diluted earnings per Ordinary share $ 2.54 $ 2.13 $ 1.68