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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock-Based Compensation [Abstract]      
Outstanding, beginning of year, Shares 1,449 1,486 1,451
Outstanding, beginning of year, Weighted-Average Exercise Price $ 274.92 $ 157.07 $ 82.56
Stock only stock appreciation rights (SOSARs) granted 672 617 587
Granted, Weighted-Average Exercise Price $ 320.21 $ 371.70 $ 268.73
Stock option and SOSAR exercises (shares) (369) (592) (536)
Exercised, Weighted-Average Exercise Price $ 176.23 $ 80.31 $ 76.78
Forfeited, Shares (62) (62) (16)
Forfeited, Weighted-Average Exercise Price $ 329.76 $ 274.25 $ 173.05
Outstanding, end of year, Shares 1,690 1,449 1,486
Outstanding, end of year, Weighted-Average Exercise Price $ 312.44 $ 274.92 $ 157.07
Outstanding, Weighted-Average Remaining Years of Contractual Life 5 years 1 month    
Outstanding, Aggregate Intrinsic Value $ 372,475    
Vested and expected to vest, Shares 1,647    
Vested and expected to vest, Weighted-Average Exercise Price $ 312.04    
Vested and expected to vest, Weighted-Average Remaining Years of Contractual Life 5 years 1 month    
Vested and expected to vest, Aggregate Intrinsic Value 363,561    
Exercisable, Shares 258    
Exercisable, Weighted-Average Exercise Price $ 210.85    
Exercisable, Weighted-Average Remaining Years of Contractual Life 3 years 10 months    
Exercisable, Aggregate Intrinsic Value $ 83,019