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Stock Based Compensation (Schedule Of Assumptions To Value SOSAR Awards Granted) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock-Based Compensation [Abstract]      
Risk-free interest rate 0.50% 0.40% 1.60%
Expected life 3 years 5 months 3 years 5 months 3 years 5 months
Expected dividend yield 0.00% 0.00% 0.00%
Volatility 35.40% 39.10% 51.00%
Weighted-average Black-Scholes fair value per share at date of grant $ 82.51 $ 104.97 $ 101.91