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Share-Based Compensation (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Y
Mar. 31, 2011
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]    
Share-based compensation maximum option term (in years) 10  
Future awards shares under approved incentive compensation plans 726,447  
Excess tax benefits as financing cash inflows $ 268,000 $ 289,000
Net cash proceeds from exercise of stock options 1,111,000 523,000
Aggregate intrinsic value of shares underlying outstanding stock options 5,976,000  
Aggregate intrinsic value of shares underlying exercisable stock options 5,455,000  
Total intrinsic value of options exercised 804,000 1,389,000
Weighted average grant date fair value of the restricted stock granted $ 51.65 $ 55.74
Minimum vesting period (in years) one-and-a half  
Maximum vesting period (in years) seven  
Compensation expense based on the number of share equivalents vested 751,000 489,000
Maximum [Member]
   
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]    
Unearned compensation vesting period (in years) 7  
Minimum [Member]
   
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]    
Unearned compensation vesting period (in years) 3  
Phantom Stock Awards [Member]
   
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]    
Minimum vesting period (in years) five  
Maximum vesting period (in years) seven  
Stock Options [Member]
   
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]    
Unrecognized compensation cost related to stock options 6,668,000  
Unrecognized compensation cost related to stock options expected to be recognized over a weighted-average period 3.7  
Unearned share-based compensation associated with awards 6,668,000  
Restricted Stock [Member]
   
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]    
Unrecognized compensation cost related to stock options 27,089,000  
Unearned share-based compensation associated with awards $ 27,089,000