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Stock Incentive Plan (Schedule Of SSAR Exercise Price Range, Number Of Shares, Weighted Average Exercise Price And Remaining Contractual Lives) (Details) - Stock Appreciation Rights (SARs) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
SSARs Outstanding (in shares) 1,099,592 1,060,192
SSARs Exercisable, Exercisable as of December 31 (in shares) 520,867  
SSARs Exercisable, Weighted Average Exercise Price (in dollars per share) $ 51.03  
$43.88-$52.85    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of Exercise Prices, lower limit (in dollars per share) 43.88  
Range of Exercise Prices, upper limit (in dollars per share) $ 52.85  
SSARs Outstanding (in shares) 528,600  
SSAR Outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 3 months 10 days  
SSARs Outstanding, Weighted Average Exercise Price (in dollars per share) $ 45.90  
SSARs Exercisable, Exercisable as of December 31 (in shares) 318,675  
SSARs Exercisable, Weighted Average Exercise Price (in dollars per share) $ 46.06  
$55.07-$73.14    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of Exercise Prices, lower limit (in dollars per share) 55.07  
Range of Exercise Prices, upper limit (in dollars per share) $ 73.14  
SSARs Outstanding (in shares) 570,992  
SSAR Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 7 months 10 days  
SSARs Outstanding, Weighted Average Exercise Price (in dollars per share) $ 64.54  
SSARs Exercisable, Exercisable as of December 31 (in shares) 202,192  
SSARs Exercisable, Weighted Average Exercise Price (in dollars per share) $ 58.88