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Stock Based Compensation (Summary Of Option And SOSAR Activity Under Incentive Plan) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock Based Compensation [Abstract]      
Outstanding, beginning of year, Shares 1,486 1,451 1,245
Outstanding, beginning of year, Weighted-Average Exercise Price $ 157.07 $ 82.56 $ 66.08
Granted, shares 617 587 561
Granted, Weighted-Average Exercise Price $ 371.70 $ 268.73 $ 104.23
Stock option and SOSAR exercises (shares) (592) (536) (325)
Exercised, Weighted-Average Exercise Price $ 80.31 $ 76.78 $ 56.95
Forfeited, Shares (62) (16) (28)
Forfeited, Weighted-Average Exercise Price $ 274.25 $ 173.05 $ 84.60
Expired, Shares     (2)
Expired, Weighted-Average Exercise Price     $ 22.00
Outstanding, end of year, Shares 1,449 1,486 1,451
Outstanding, end of year, Weighted-Average Exercise Price $ 274.92 $ 157.07 $ 82.56
Outstanding as of December 31, 2012, Weighted-Average Remaining Years of Contractual Life 5 years 4 months    
Outstanding as of December 31, 2012, Aggregate Intrinsic Value $ 76,791    
Vested and expected to vest as of December 31, 2012, Shares 1,422    
Vested and expected to vest as of December 31, 2012, Weighted-Average Exercise Price $ 273.70    
Vested and expected to vest as of December 31, 2012, Weighted-Average Remaining Years of Contractual Life 5 years 4 months    
Vested and expected to vest as of December 31, 2012, Aggregate Intrinsic Value 76,444    
Exercisable as of December 31, 2012, Shares 68    
Exercisable as of December 31, 2012, Weighted-Average Exercise Price $ 139.05    
Exercisable as of December 31, 2012, Weighted-Average Remaining Years of Contractual Life 3 years 11 months    
Exercisable as of December 31, 2012, Aggregate Intrinsic Value $ 11,754