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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) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Current Fiscal Year End Date --12-31  
Stock Appreciation Rights (SARs)    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
SSARs Outstanding, Number of Shares 1,319,911 1,220,824
SSARs Exercisable, Exercisable as of December 31 610,140  
SSARs Exercisable, Weighted Average Exercise Price $ 49.54  
Stock Appreciation Rights (SARs) | $32.01 - $43.88    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of Exercise Prices, lower limit 32.01  
Range of Exercise Prices, upper limit $ 43.88  
SSARs Outstanding, Number of Shares 429,025  
SSAR Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 9 months 18 days  
SSARs Outstanding, Weighted Average Exercise Price $ 41.25  
SSARs Exercisable, Exercisable as of December 31 112,650  
SSARs Exercisable, Weighted Average Exercise Price $ 33.86  
Stock Appreciation Rights (SARs) | $47.89 - $63.64    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of Exercise Prices, lower limit 47.89  
Range of Exercise Prices, upper limit $ 63.64  
SSARs Outstanding, Number of Shares 890,886  
SSAR Outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 10 months 24 days  
SSARs Outstanding, Weighted Average Exercise Price $ 53.56  
SSARs Exercisable, Exercisable as of December 31 497,490  
SSARs Exercisable, Weighted Average Exercise Price $ 53.09