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Stock Plans (Details)	6 Months Ended
Stock Plans (Details)	Jun. 30, 2011
Stock Plans
Vesting period for grants (years)	four
Term of options outstanding (years)	10

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.

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