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Stock-Based Compensation (Summary Of Nonvested Share Activity) (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted, Number of Share Units (4,736) (57,052) (4,874) (192,407)    
Stock Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Nonvested share units at beginning of period, Number of Share Units        
Granted, Number of Share Units         (7,660)  
Stock units vested and issued, Number of Share Units         (7,660)  
Nonvested share units at end of period, Number of Share Units        
Nonvested share units at beginning of period, Weighted Average Fair Value        
Granted, Weighted Average Fair Value         46.66 $ 45.28
Share units vested, Weighted Average Fair Value         46.66  
Nonvested share units at end of period, Weighted Average Fair Value