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Employee Benefit Plans (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Pension Plan |  |  |
Employee benefit plans |  |  |
Contribution made by the entity under the pension plan | $ 100,000 | $ 200,000 | $ 200,000
401 (k) Plan |  |  |
Employee benefit plans |  |  |
Matching contribution by employer as a percentage of the employee's deferral | 100.00% |  |
Matching contribution by employer as a percentage of U.S. employee's qualifying compensation | 6.00% |  |
Statutorily prescribed annual limit of contributions made by an employee before attaining specified age | 16,500 |  |
Statutorily prescribed annual limit of contributions made by an employee after attaining specified age | 22,000 |  |
Specified age limit of employees for calculation of statutorily prescribed annual limit of contribution | 50 |  |
Contribution made by the entity under the 401(k) Plan | $ 100,000 | $ 100,000 | $ 100,000

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- Definition Represents the statutorily prescribed annual limit of contributions made by an employee to the defined contribution plan after attaining specified age. + References No definition available. + Details
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- Definition Represents the statutorily prescribed annual limit of contributions made by an employee to the defined contribution plan before attaining specified age. + References No definition available. + Details
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- Definition Represents the percentage of employees' deferral for which the employer contributes a matching contribution to the defined contribution plan. + References No definition available. + Details
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- Definition Represents the specified age limit of employees for calculation of statutorily prescribed annual limit of contribution. + References No definition available. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
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