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Stock-Based Compensation Arrangements (Details) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010
Stock-based compensation |  |
Vesting period | 4 years |
Percentage of the award vesting one year from the date of grant | 0.25 |
Period for vesting of one-fourth award | 1 year |
Percentage of the award vesting each month after one year | 0.0208 |
Percentage of the award vesting each month |  | 0.0208
Executive officers | Minimum |  |
Stock-based compensation |  |
Vesting period |  | 3 years
Executive officers | Maximum |  |
Stock-based compensation |  |
Vesting period |  | 5 years

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- Definition Represents the percentage of the awards vesting each month from the date of grant. + References No definition available. + Details
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- Definition Represents the percentage of the awards vesting each month after one year from the date of grant. + References No definition available. + Details
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- Definition Percentage of the award vesting at the first year from the date of grant. + References No definition available. + Details
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- Definition Represents the period from the date of grant for the vesting of one-fourth of the award . + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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