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Share-based Compensation and Non-Qualified Deferred Compensation Plan (Summary Of Share Incentive Plans) (Details) - $ / shares
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Nonvested share awards outstanding at December 31, 2018, Share Awards Outstanding 390,681  
Granted, Share Awards Outstanding 197,372  
Exercised/Vested, Share Awards Outstanding (254,854)  
Forfeited, Share Awards Outstanding (11,002)  
Nonvested share awards outstanding at June 30, 2019, Share Awards Outstanding 322,197  
Nonvested share awards outstanding at December 31, 2018, Weighted Average Exercise/Grant Price $ 79.82  
Granted, Weighted Average Exercise/Grant Price 98.71 $ 82.73
Exercised/Vested, Weighted Average Exercise/Grant Price 81.40  
Forfeited, Weighted Average Exercise/Grant Price 84.29  
Nonvested share awards outstanding at June 30, 2019, Weighted Average Exercise/Grant Price $ 89.99