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Stock-Based Compensation (Schedule Of Weighted Average Assumptions) (Details) (Stock Option [Member], USD $)
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3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Stock Option [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Expected term, years | 7 years 7 days | 7 years 8 months 8 days | 4 years 8 months 19 days | 4 years 9 months 14 days |
| Expected stock price volatility | 28.54% | 29.66% | 30.80% | 32.20% |
| Risk-free interest rate | 1.55% | 1.09% | 0.69% | 0.89% |
| Expected dividend yield | 1.44% | 1.79% | 1.63% | 1.80% |
| Weighted average grant date fair value (in dollars per share) | $ 16.45 | $ 12.85 | $ 12.31 | $ 11.57 |
| Stock options granted (in shares) | 327,979 | 354,934 | ||
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- Definition
The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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