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Share-Based Compensation and Benefit Plans (Summary Of Share Incentive Plans) (Details) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Nonvested share awards outstanding, Beginning balance 239,728    
Granted, Share Awards Outstanding 188,636    
Exercised/Vested, Share Awards Outstanding (231,661)    
Forfeited, Share Awards Outstanding (12,575)    
Nonvested share awards outstanding, Ending balance 184,128 239,728  
Nonvested share awards outstanding, Weighted Average Exercise/Grant Price Beginning $ 103.48    
Granted, Weighted Average Exercise/Grant Price 105.87 $ 113.46 $ 98.84
Exercised/Vested, Weighted Average Exercise/Grant Price 101.97    
Forfeited, Weighted Average Exercise/Grant Price 107.41    
Nonvested share awards outstanding, Weighted Average Exercise/Grant Price Ending $ 107.57 $ 103.48