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Stock-Based Compensation (Summary Of RSU Transactions) (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 Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Nonvested share units at beginning of period, Number of Share Units   141,884     141,884  
Granted, Number of Share Units         60,635  
Stock units vested and issued, Number of Share Units         (39,526)  
Forfeited, Number of Share Units         (617)  
Nonvested share units at end of period, Number of Share Units 162,376       162,376  
Nonvested share units at beginning of period, Weighted Average Fair Value   $ 34.39     $ 34.39  
Granted, Weighted Average Fair Value         49.48 $ 36.01
Share units vested, Weighted Average Fair Value         31.25  
Forfeited, Weighted Average Fair Value         41.75  
Nonvested share units at end of period, Weighted Average Fair Value $ 40.72       $ 40.72