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Earnings Per Share (Schedule Of Number Of Anti-Dilutive Stock Options And Restricted Stock Units) (Details)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock Options [Member]
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Weighted average number of anti-dilutive securities 597 501 878
Restricted Stock Units [Member]
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Weighted average number of anti-dilutive securities     2