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Incentive Plans (Summary Of Activity Of Executive Continuity And Restricted Stock Award Program) (Details) (Executive Continuity And Restricted Stock Award Program [Member], USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Executive Continuity And Restricted Stock Award Program [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares/Units, Outstanding 128,917 167,500 83,000
Shares/Units, Granted 88,715 21,500 177,000
Shares/Units, Shares issued (61,083) (55,083) (92,500)
Shares/Units, Forfeited (5,000) (5,000)  
Shares/Units, Outstanding 151,549 128,917 167,500
Weighted Average Grant Date Fair Value, Outstanding $ 27.86 $ 26.95 $ 33.93
Weighted Average Grant Date Fair Value, Granted $ 31.91 $ 27.01 $ 25.63
Weighted Average Grant Date Fair Value, Shares issued $ 27.13 $ 24.84 $ 30.69
Weighted Average Grant Date Fair Value, Outstanding $ 30.49 $ 27.86 $ 26.95
Weighted Average Grant Date Fair Value, Forfeited $ 28.91 $ 26.78