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Stock-Based Compensation (Summary Of Stock Option Transactions) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercised, Shares (56,106) (77,479)
Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding at beginning of period, Shares 1,041,756  
Granted, Shares 0  
Forfeited, Shares (9,516)  
Exercised, Shares (56,106)  
Outstanding at end of period, Shares 976,134  
Exercisable at end of period, Shares 438,341  
Outstanding at beginning of period, Weighted Average Exercise Price $ 34.22  
Forfeited, Weighted Average Exercise Price 35.75  
Exercised, Weighted Average Exercise Price 16.93  
Outstanding at end of period, Weighted Average Exercise Price 35.20  
Exercisable at end of period, Weighted Average Exercise Price $ 34.43  
Outstanding at end of period, Weighted Average Remaining Life (years) 8 years 7 months 6 days  
Exercisable at end of period, Weighted Average Remaining Life (years) 8 years 2 months 12 days  
Outstanding at end of period, Aggregate Intrinsic Value $ 5,366  
Exercisable at end of period, Aggregate Intrinsic Value $ 2,750