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12/31/2010
USD ($)

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12/31/2010
USD ($)
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{us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis} : Level 3
1/1/2010 - 12/31/2010
USD ($)
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12/31/2010
USD ($)
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1/1/2010 - 12/31/2010
USD ($)
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12/31/2010
USD ($)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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 -Name Statement of Financial Accounting Standard (FAS)
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 -Paragraph 5
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 87
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