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Stock Plans (Schedule Of Weighted Average Exercise Price Of Stock Option Plans) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares, Outstanding Ending Balance 4,450    
Weighted Average Exercise Price Per Share, Outstanding Ending Balance $ 21.85    
Stock Option Plans [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares, Outstanding Beginning Balance 5,316 7,289 9,178
Number of Shares, Granted         
Number of Shares, Exercised (806) (1,726) (1,700)
Number of Shares, Forfeited (60) (247) (189)
Number of Shares, Outstanding Ending Balance 4,450 5,316 7,289
Weighted Average Exercise Price Per Share, Outstanding Beginning Balance $ 22.04 $ 22.34 $ 20.98
Weighted Average Exercise Price Per Share, Granted         
Weighted Average Exercise Price Per Share, Exercised $ 22.73 $ 22.22 $ 14.68
Weighted Average Exercise Price Per Share, Forfeited $ 26.05 $ 29.66 $ 25.42
Weighted Average Exercise Price Per Share, Outstanding Ending Balance $ 21.85 $ 22.04 $ 22.34
Restricted Stock Plans [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares/Units, Outstanding Beginning Balance 3,996 5,369 5,002
Number of Share/Units, Exercised         
Number of Shares/Units, Granted 1,402 1,545 2,827
Number of Shares/Units, Restrictions lapsed (2,389) (2,722) (2,125)
Number of Shares/Units, Forfeited (94) (196) (335)
Number of Shares/Units, Outstanding Ending Balance 2,915 3,996 5,369
Weighted Average Grant Date Fair Value, Outstanding Beginning Balance $ 23.44 $ 24.87 $ 31.00
Weighted Average Grant Date Fair Value, Exercised         
Weighted Average Grant Date Fair Value, Granted $ 32.02 $ 26.81 $ 16.36
Weighted Average Grant Date Fair Value, Restrictions Lapsed $ 25.27 $ 28.17 $ 27.80
Weighted Average Grant Date Fair Value, Forfeited $ 23.09 $ 23.48 $ 25.98
Weighted Average Grant Date Fair Value, Outstanding Ending Balance $ 26.08 $ 23.44 $ 24.87