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Stock-Based Compensation (Summary Of RSU Transactions) (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted, Number of Share Units 4,165 5,099 134,257 4,423 3,969 181,670    
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     130,085       130,085  
Granted, Number of Share Units             55,686  
Stock units vested and issued, Number of Share Units             (40,971)  
Forfeited, Number of Share Units             (4,398)  
Nonvested share units at end of period, Number of Share Units 140,402           140,402  
Nonvested share units at beginning of period, Weighted Average Fair Value     $ 33.13       $ 33.13  
Granted, Weighted Average Fair Value             36.01 $ 35.15
Share units vested, Weighted Average Fair Value             32.89  
Forfeited, Weighted Average Fair Value             35.26  
Nonvested share units at end of period, Weighted Average Fair Value $ 34.28           $ 34.28