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Equity Incentive Plans (Summary Of Nonvested Share Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Document Period End Date Dec. 31, 2019    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price $ 66.38    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Number of Shares, Outstanding at December 31, 2018 655,056    
Number of Shares, Granted 208,755    
Number of Shares, Vested (346,145)    
Number of Shares, Outstanding at December 31, 2019 509,338 655,056  
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2018 $ 64.16    
Weighted Average Grant Date Fair Value, Granted 74.13    
Weighted Average Grant Date Fair Value, Vested $ 64.66    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 8,328    
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2019 $ 67.88 $ 64.16  
Weighted Average Life Remaining, Outstanding at December 31, 2019 26 days    
Fair value of non-vested shares $ 22,700 $ 16,000 $ 15,100
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options $ 15,303