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Stock-Based Compensation (Summary Of Nonvested Share Activity) (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted, Number of Share Units 4,594 223,495 5,099 134,257    
Restricted Stock [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         11,952 0
Stock units vested and issued, Number of Share Units          
Nonvested share units at end of period, Number of Share Units 11,952       11,952  
Nonvested share units at beginning of period, Weighted Average Fair Value        
Granted, Weighted Average Fair Value         33.47  
Share units vested, Weighted Average Fair Value          
Nonvested share units at end of period, Weighted Average Fair Value $ 33.47       $ 33.47  
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         8,456  
Stock units vested and issued, Number of Share Units         (8,456)  
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         40.80 $ 38.82
Share units vested, Weighted Average Fair Value         40.80  
Nonvested share units at end of period, Weighted Average Fair Value