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Share-Based Compensation (Summary Of Stock Option Activity) (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding Shares, Beginning balance (in shares) | shares 42,500
Granted, (in shares) | shares 80,000
Exercised, (in shares) | shares (8,000)
Canceled or expired, (in shares) | shares (15,000)
Outstanding Shares, Ending balance (in share) | shares 99,500
Exercisable, (in shares) | shares 19,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Outstanding, Weighted-Average Exercise Price, Beginning balance (in dollars per share) | $ / shares $ 44.72
Granted, Weighted-Average Exercise Price (in dollars per share) | $ / shares 43.01
Exercised, Weighted-Average Exercise Price (in dollars per share) | $ / shares 44.75
Canceled or Expired, Weighted-Average Exercise Price (in dollars per share) | $ / shares 48.52
Outstanding, Weighted-Average Exercise Price, Ending balance (in dollars per share) | $ / shares 42.77
Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ / shares $ 41.78
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Outstanding, Weighted-Average Remaining Contractual Term (Years) 7 years 10 months 25 days
Exercisable, Weighted-Average Remaining Contractual Term (Years) 3 years 2 months 12 days
Outstanding, Aggregate Intrinsic Value | $ $ 890
Exercisable, Aggregate Intrinsic Value | $ $ 194