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Stock-Based Compensation (Schedule Of Weighted Average Assumptions For Restricted Stock Units) (Details) (Restricted Stock Units [Member], USD $)
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12 Months Ended | ||
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Dec. 31, 2011
years
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Dec. 31, 2010
years
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Dec. 31, 2009
years
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Restricted Stock Units [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Vesting period, years | 3.96 | 3.75 | 3.82 |
| Expected dividend yield | 1.33% | 1.56% | 2.19% |
| Estimated average fair value per restricted stock unit granted | $ 58.37 | $ 43.95 | $ 27.14 |
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- Definition
The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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
The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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