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Stock Option And Stock Award Plans (Summary Of Stock Options Outstanding) (Details) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Options      
Number of Options, Outstanding, Beginning Balance 1,628,903 890,116 608,520
Number of Options, Granted 638,074 758,287 451,083
Share-based Compensation Arrangements by Share-based Payment Award, Options, Modification, Weighted Average Exercise Price $ 11.90    
Number of Options, Forfeited and Expired (141,074) (10,000) (96,089)
Number of Options, Exercised 0 (9,500) (73,398)
Number of Options, Outstanding, Ending Balance 2,827,438 1,628,903 890,116
Weighted Average      
Weighted Average Option Exercise Price/Share, Outstanding, Beginning Balance $ 19.13 $ 19.69 $ 19.75
Weighted Average Option Exercise Price/Share, Granted 11.90 18.48 19.35
Weighted Average Option Exercise Price/Share, Forfeited and Expired 11.87 19.40 19.58
Weighted Average Option Exercise Price/Share, Exercised 0 19.40 18.15
Weighted Average Option Exercise Price/Share, Outstanding, Ending Balance 13.55 19.13 19.69
Minimum      
Option Exercise Price/Share Range      
Exercise Price, Outstanding, Beginning Balance 15.65 15.65 15.65
Exercise Price, Granted 10.75 18.48 19.35
Exercise Price, Forfeited and Expired 10.75 19.40 15.65
Exercise Price, Exercised 0 19.40 15.65
Exercise Price, Outstanding, Ending Balance 10.75 15.65 15.65
Maximum      
Option Exercise Price/Share Range      
Exercise Price, Outstanding, Beginning Balance 24.84 24.84 24.84
Exercise Price, Granted 14.62 18.48 19.35
Exercise Price, Forfeited and Expired 24.84 19.40 24.84
Exercise Price, Exercised 0 19.40 22.49
Exercise Price, Outstanding, Ending Balance $ 22.49 $ 24.84 $ 24.84