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Share-Based Compensation (Summary Of Stock Option Activity) (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding Shares, Beginning balance | shares 248,000
Granted, Shares | shares 0
Exercised, Shares | shares (43,000)
Cancelled or expired, Shares | shares (37,000)
Outstanding Shares, Ending balance | shares 168,000
Exercisable, Shares | shares 128,000
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 $ 49.85
Granted, Weighted-Average Exercise Price (in dollars per share) | $ / shares
Exercised, Weighted-Average Exercise Price (in dollars per share) | $ / shares $ 49.10
Canceled or Expired, Weighted-Average Exercise Price (in dollars per share) | $ / shares 58.48
Outstanding, Weighted-Average Exercise Price, Ending balance (in dollars per share) | $ / shares 48.14
Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ / shares $ 49.58
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Outstanding, Weighted-Average Remaining Contractual Term (Years) 3 years 9 months 21 days
Exercisable, Weighted-Average Remaining Contractual Term (Years) 2 years 8 months 21 days
Outstanding, Aggregate Intrinsic Value | $ $ 305
Exercisable, Aggregate Intrinsic Value | $ $ 183