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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, 2019
Dec. 31, 2018
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
SSARs Outstanding (in shares) 759,675 1,099,592
SSARs Exercisable, Exercisable as of December 31 (in shares) 209,625  
SSARs Exercisable, Weighted Average Exercise Price (in dollars per share) $ 56.15  
$43.88 - $55.23    
Share-based Payment Arrangement, Option, 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) $ 55.23  
SSARs Outstanding (in shares) 175,825  
SSAR Outstanding, Weighted Average Remaining Contractual Life (Years) 2 years 7 months 6 days  
SSARs Outstanding, Weighted Average Exercise Price (in dollars per share) $ 46.52  
SSARs Exercisable, Exercisable as of December 31 (in shares) 111,100  
SSARs Exercisable, Weighted Average Exercise Price (in dollars per share) $ 46.45  
$62.85 - $ 73.14    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Range of Exercise Prices, lower limit (in dollars per share) 62.85  
Range of Exercise Prices, upper limit (in dollars per share) $ 73.14  
SSARs Outstanding (in shares) 583,850  
SSAR Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 1 month 6 days  
SSARs Outstanding, Weighted Average Exercise Price (in dollars per share) $ 65.75  
SSARs Exercisable, Exercisable as of December 31 (in shares) 98,525  
SSARs Exercisable, Weighted Average Exercise Price (in dollars per share) $ 67.09