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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 (SSARs) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
SSARs Outstanding (in shares) 194,611 403,150
SSARs Exercisable (in shares) 73,936  
SSARs Exercisable, Weighted Average Exercise Price (in dollars per share) $ 66.63  
$46.58 - $63.47    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Range of Exercise Prices, lower limit (in dollars per share) 46.58  
Range of Exercise Prices, upper limit (in dollars per share) $ 63.47  
SSARs Outstanding (in shares) 80,523  
SSAR Outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 6 months 3 days  
SSARs Outstanding, Weighted Average Exercise Price (in dollars per share) $ 61.91  
SSARs Exercisable (in shares) 38,923  
SSARs Exercisable, Weighted Average Exercise Price (in dollars per share) $ 60.91  
$72.74 - $73.14    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Range of Exercise Prices, lower limit (in dollars per share) 72.74  
Range of Exercise Prices, upper limit (in dollars per share) $ 73.14  
SSARs Outstanding (in shares) 114,088  
SSAR Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 4 months 28 days  
SSARs Outstanding, Weighted Average Exercise Price (in dollars per share) $ 72.86  
SSARs Exercisable (in shares) 35,013  
SSARs Exercisable, Weighted Average Exercise Price (in dollars per share) $ 72.99