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Employee Stock And Incentive Plan (Summary Of Options Outstanding And Options Exercisable) (Details) - Stock Options [Member]
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Shares | shares 1,033,770
Options Outstanding, Weighted Average Remaining Life 8 years 4 months 24 days
Options Outstanding, Weighted Average Exercise Price $ 34.20
Options Exercisable, Shares | shares 164,117
Options Exercisable, Weighted Average Exercise Price $ 26.86
$13.00 - 14.99 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of prices, Lower limit 13.00
Range of prices, Upper limit $ 14.99
Options Outstanding, Shares | shares 47,388
Options Outstanding, Weighted Average Remaining Life 1 month 6 days
Options Outstanding, Weighted Average Exercise Price $ 13.72
Options Exercisable, Shares | shares 47,388
Options Exercisable, Weighted Average Exercise Price $ 13.72
$15.00 - 33.99 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of prices, Lower limit 15.00
Range of prices, Upper limit $ 33.99
Options Outstanding, Shares | shares 99,661
Options Outstanding, Weighted Average Remaining Life 7 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price $ 30.47
Options Exercisable, Shares | shares 67,649
Options Exercisable, Weighted Average Exercise Price $ 30.47
$34.00 - 34.99 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of prices, Lower limit 34.00
Range of prices, Upper limit $ 34.99
Options Outstanding, Shares | shares 138,113
Options Outstanding, Weighted Average Remaining Life 8 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price $ 34.51
Options Exercisable, Shares | shares 46,214
Options Exercisable, Weighted Average Exercise Price $ 34.51
$35.00 - 35.99 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of prices, Lower limit 35.00
Range of prices, Upper limit $ 35.99
Options Outstanding, Shares | shares 748,608
Options Outstanding, Weighted Average Remaining Life 9 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price $ 35.93
Options Exercisable, Shares | shares 2,866
Options Exercisable, Weighted Average Exercise Price $ 35.44