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Stock-Based Compensation (Summary Of RSU Transactions) (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    
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   193,687     193,687  
Granted, Number of Share Units         71,376  
Stock units vested and issued, Number of Share Units         (54,926)  
Forfeited, Number of Share Units         (6,621)  
Nonvested share units at end of period, Number of Share Units 203,516       203,516  
Nonvested share units at beginning of period, Weighted Average Fair Value   $ 43.76     $ 43.76  
Granted, Weighted Average Fair Value         45.10 $ 44.44
Share units vested, Weighted Average Fair Value         36.76  
Forfeited, Weighted Average Fair Value         44.77  
Nonvested share units at end of period, Weighted Average Fair Value $ 46.12       $ 46.12