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Stock-Based Compensation (Summary Of Restricted Stock Transactions) (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity compensation plan, shares (4,736) (57,052) (4,874) (192,407)  
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   1,068     1,068
Equity compensation plan, shares         0
Vested, number of shares        
Nonvested share units at end of period, Number of Share Units 1,068       1,068
Nonvested share units at beginning of period, Weighted Average Fair Value   $ 46.83     $ 46.83
Granted, Weighted Average Fair Value         0
Share units vested, Weighted Average Fair Value        
Nonvested share units at end of period, Weighted Average Fair Value $ 46.83       $ 46.83