Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Schedule Of Weighted Average Assumptions) (Details)

v2.4.0.8
Stock-Based Compensation (Schedule Of Weighted Average Assumptions) (Details) (Stock Option [Member], USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Stock Option [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected term, years 4 years 5 months 26 days 4 years 6 months 4 days 4 years 8 months 16 days 4 years 9 months 11 days
Expected stock price volatility 26.87% 31.95% 30.63% 32.20%
Risk-free interest rate 1.01% 0.47% 0.70% 0.88%
Expected dividend yield 1.38% 1.63% 1.62% 1.80%
Weighted average grant date fair value (in dollars per share) $ 13.04 $ 12.37 $ 12.34 $ 11.57