Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Stock-Based Compensation (Schedule Of Weighted Average Assumptions) (Details) - Stock Option [Member] - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected term, years 7 years 8 months 22 days 7 years 5 months 16 days 4 years 7 months 17 days 4 years 7 months 5 days
Expected stock price volatility 30.95% 29.54% 29.80% 26.53%
Risk-free interest rate 1.47% 1.95% 1.17% 1.20%
Expected annual dividend yield 1.21% 1.04% 1.20% 1.26%
Weighted average grant date fair value (in dollars per share) $ 17.47 $ 17.81 $ 13.39 $ 10.31