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Equity Incentive Plans (Summary Of Nonvested Share Activity) (Details) (USD $)
In Millions, except 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, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Number of Shares, Outstanding at December 31, 2010 372,308    
Number of Shares, Granted 137,020    
Number of Shares, Vested (158,465)    
Number of Shares, Outstanding at December 31, 2011 350,863 372,308  
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2010 $ 33.89    
Weighted Average Grant Date Fair Value, Granted $ 45.85    
Weighted Average Grant Date Fair Value, Vested $ 34.90    
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2011 $ 38.11 $ 33.89  
Weighted Average Life Remaining, Outstanding at September 30, 2011 0.77    
Share based compensation, future vesting period minimum (in years) three    
Share based compensation, future vesting period maximum (in years) five    
Fair value of non-vested shares $ 7.3 $ 5.0 $ 2.8