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Stock Option And Stock Award Plans (Summary Of Stock Options Outstanding) (Details) - $ / shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Options      
Number of Options, Outstanding, Beginning Balance 2,827,438 1,628,903 890,116
Number of Options, Granted 388,822 638,074 758,287
Number of Options, Forfeited and Expired (22,611) 701,535 (10,000)
Number of Options, Exercised (67,705) (141,074) (9,500)
Number of Options, Outstanding, Ending Balance 3,125,944 2,827,438 1,628,903
Weighted Average      
Weighted Average Option Exercise Price/Share, Outstanding, Beginning Balance $ 13.55 $ 19.13 $ 19.69
Weighted Average Option Exercise Price/Share, Granted 16.37 11.90 18.48
Weighted Average Option Exercise Price/Share, Forfeited and Expired 18.14 11.90 19.40
Weighted Average Option Exercise Price/Share, Exercised 13.51 11.87 19.40
Weighted Average Option Exercise Price/Share, Outstanding, Ending Balance 13.82 13.55 19.13
Minimum      
Option Exercise Price/Share Range      
Exercise Price, Outstanding, Beginning Balance 10.75 15.65 15.65
Exercise Price, Granted 16.37 10.75 18.48
Exercise Price, Forfeited and Expired 14.47 10.75 19.40
Exercise Price, Exercised 10.75 10.75 19.40
Exercise Price, Outstanding, Ending Balance 10.75 10.75 15.65
Maximum      
Option Exercise Price/Share Range      
Exercise Price, Outstanding, Beginning Balance 22.49 24.84 24.84
Exercise Price, Granted 16.37 14.62 18.48
Exercise Price, Forfeited and Expired 19.64 14.62 19.40
Exercise Price, Exercised 17.29 24.84 19.40
Exercise Price, Outstanding, Ending Balance $ 22.49 $ 22.49 $ 24.84