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Summary Of Significant Accounting Policies (Schedule Of Assumptions For Valuing Stock Options Granted) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Dividend yield 1.10% 0.90% 0.90%
Weighted average volatility percentage 48.30% 48.70% 46.40%
Weighted average risk-free interest rate 1.10% 1.00% 2.50%
Weighted average exercise price at date of grant (also weighted average market price at date of grant): $ 24.97 $ 19.34 $ 19.79
Officers
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Holding period (years): 6 years 6 years 6 years
Weighted average exercise price at date of grant (also weighted average market price at date of grant): $ 24.84 $ 19.30 $ 19.84
Management
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Holding period (years): 5 years 5 years 5 years
Weighted average exercise price at date of grant (also weighted average market price at date of grant): $ 25.10 $ 19.40 $ 19.73