Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.6
Stock-Based Compensation (Schedule Of Weighted Average Assumptions) (Details) (Stock Option [Member], USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 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
Expected stock price volatility 31.02% 32.44%
Risk-free interest rate 0.61% 0.87%
Expected dividend yield 1.65% 1.80%
Weighted average grant date fair value (in dollars per share) $ 11.91 $ 11.44
Stock options granted (in shares) 298,805 323,615