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Stock Compensation Plans (Schedule Of SSAR Exercise Price Range, Number Of Shares, Weighted Average Exercise Price And Remaining Contractual Lives) (Details) - $ / shares
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
$21.45 - $32.01 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices, lower limit, dollars per share $ 21.45  
Range of Exercise Prices, upper limit, dollars per share 32.01  
$33.65 - $43.88 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices, lower limit, dollars per share 33.65  
Range of Exercise Prices, upper limit, dollars per share 43.88  
$47.89 - $63.64 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices, lower limit, dollars per share 47.89  
Range of Exercise Prices, upper limit, dollars per share $ 63.64  
Stock Appreciation Rights (SARs) [Member]    
SSARs Outstanding    
SSARs Outstanding, shares 1,425,874 1,220,824
Weighted Average Remaining Contractual Life, years 5 years  
SSARs Exercisable    
Number of Shares 684,227  
Weighted Average Exercise Price, dollars per share $ 48.43  
Stock Appreciation Rights (SARs) [Member] | $21.45 - $32.01 [Member]    
SSARs Outstanding    
SSARs Outstanding, shares 27,500  
Weighted Average Remaining Contractual Life, years 8 months 12 days  
Weighted Average Exercise Price, dollars per share $ 22.51  
SSARs Exercisable    
Number of Shares 27,500  
Weighted Average Exercise Price, dollars per share $ 22.51  
Stock Appreciation Rights (SARs) [Member] | $33.65 - $43.88 [Member]    
SSARs Outstanding    
SSARs Outstanding, shares 443,100  
Weighted Average Remaining Contractual Life, years 5 years 2 months 12 days  
Weighted Average Exercise Price, dollars per share $ 41.22  
SSARs Exercisable    
Number of Shares 117,175  
Weighted Average Exercise Price, dollars per share $ 33.83  
Stock Appreciation Rights (SARs) [Member] | $47.89 - $63.64 [Member]    
SSARs Outstanding    
SSARs Outstanding, shares 955,274  
Weighted Average Remaining Contractual Life, years 4 years 4 months 24 days  
Weighted Average Exercise Price, dollars per share $ 53.52  
SSARs Exercisable    
Number of Shares 539,552  
Weighted Average Exercise Price, dollars per share $ 52.92