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Stock Incentive Plans (Option Pricing Assumptions)
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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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| Stock Incentive Plans [Abstract] | |||
| Expected life (in years) | 5.2 | 5.8 | 5.8 |
| Risk-free interest rate | 0.90% | 2.70% | 2.20% |
| Expected volatility | 49.90% | 48.20% | 50.90% |
| Expected dividend yield | 0.00% | 0.00% | 0.00% |
| X | ||||||||||
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- Details
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| X | ||||||||||
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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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| X | ||||||||||
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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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| X | ||||||||||
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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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| X | ||||||||||
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- Definition
The range of expected volatilities used and the weighted-average expected volatility for an entity using a valuation technique with different volatilities during the contractual term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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