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Stock-Based Compensation (Summary Of Stock Option Transactions) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Exercised, Shares (54,672) (22,786) (20,201) (4,270) (3,411) (56,106)    
Stock Options [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Outstanding at beginning of period, Shares     948,270       948,270  
Granted, Shares             0 0
Forfeited, Shares             (7,219)  
Expired, Shares             (984)  
Exercised, Shares             (97,659)  
Outstanding at end of period, Shares 842,408           842,408  
Exercisable at end of period, Shares 609,410           609,410  
Outstanding at beginning of period, Weighted Average Exercise Price     $ 35.22       $ 35.22  
Forfeited, Weighted Average Exercise Price             35.91  
Expired, Weighted Average Exercise Price             33.93  
Exercised, Weighted Average Exercise Price             33.72  
Outstanding at end of period, Weighted Average Exercise Price $ 35.22           35.22  
Exercisable at end of period, Weighted Average Exercise Price $ 35.17           $ 35.17  
Outstanding at end of period, Weighted Average Remaining Life (years)             7 years 1 month 6 days  
Exercisable at end of period, Weighted Average Remaining Life (years)             7 years  
Outstanding at end of period, Aggregate Intrinsic Value $ 9,009,081           $ 9,009,081  
Exercisable at end of period, Aggregate Intrinsic Value $ 6,650,661           $ 6,650,661