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Stock Based Compensation (Summary Of Option And SOSAR Activity Under Incentive Plan) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock-Based Compensation [Abstract]      
Outstanding, beginning of year, Shares 2,087 1,690 1,449
Outstanding, beginning of year, Weighted-Average Exercise Price $ 395.46 $ 312.44 $ 274.92
Shares granted 379 764 672
Granted, Weighted-Average Exercise Price $ 659.12 $ 545.66 $ 320.21
Stock option and SOSAR exercises (shares) (716) (315) (369)
Exercised, Weighted-Average Exercise Price $ 297.25 $ 310.32 $ 176.23
Forfeited, Shares (56) (52) (62)
Forfeited, Weighted-Average Exercise Price $ 554.73 $ 419.74 $ 329.76
Outstanding, end of year, Shares 1,694 2,087 1,690
Outstanding, end of year, Weighted-Average Exercise Price $ 490.70 $ 395.46 $ 312.44
Outstanding, Weighted-Average Remaining Years of Contractual Life 4 years 10 months 24 days    
Outstanding, Aggregate Intrinsic Value $ 92,773    
Vested and expected to vest, Shares 1,640    
Vested and expected to vest, Weighted-Average Exercise Price $ 486.10    
Vested and expected to vest, Weighted-Average Remaining Years of Contractual Life 4 years 9 months 18 days    
Vested and expected to vest, Aggregate Intrinsic Value $ 92,622    
Exercisable, Shares 321    
Exercisable, Weighted-Average Exercise Price $ 339.72    
Exercisable, Weighted-Average Remaining Years of Contractual Life 3 years 6 months    
Exercisable, Aggregate Intrinsic Value $ 45,112