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Benefit Plans (Details) (Employee Stock Option [Member])
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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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Employee Stock Option [Member]
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| Fair value of options granted to employees and members of our board of directors | ||||
| Risk-free interest rate | 0.70% | 0.80% | 0.70% | 0.80% |
| Expected life of options — years | 4 years 8 months 16 days | 5 years 1 month 13 days | 4 years 8 months 16 days | 5 years 2 months 1 day |
| Expected stock price volatility | 48.00% | 53.00% | 48.00% | 54.00% |
| Expected dividend yield | 0.00% | 0.00% | 0.00% | 0.00% |
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- Details
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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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