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Stock Plans (Details 1) (USD $)
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3 Months Ended | |
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Mar. 31, 2013
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Mar. 31, 2012
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| Schedule of assumptions used to estimate the share-based compensation expense | ||
| Weighted-average risk-free interest rate | 0.64% | 0.94% |
| Expected dividend payments | ||
| Expected holding period (years) | 4 years 4 months 24 days | 5 years 1 month 6 days |
| Weighted-average volatility factor | 1.83 | 1.74 |
| Estimated forfeiture rates for options granted to management | 23.00% | 23.00% |
| Estimated forfeiture rates for options granted to non-management | 41.00% | 41.00% |
| X | ||||||||||
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- Definition
Estimated forfeiture rates for options granted to management. No definition available.
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- Definition
Estimated forfeiture rates for options granted to non management. No definition available.
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- Details
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| X | ||||||||||
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- Definition
Share based goods and nonemployee services transaction valuation method weighted average volatility factor. No definition available.
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| X | ||||||||||
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- Definition
The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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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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| X | ||||||||||
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- Definition
The risk-free interest rate assumption that is used in valuing a nonvested share or option award issued to other than an employee. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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