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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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{us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis} : Significant Other Observable Inputs (Level 2) [Member]
12/31/2010
USD ($)
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{us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis} : Significant Unobservable Inputs (Level 3) [Member]
12/31/2010
USD ($)
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12/31/2010
USD ($)
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{us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis} : Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
12/31/2010
USD ($)
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{us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis} : Significant Other Observable Inputs (Level 2) [Member]
12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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{us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis} : Significant Other Observable Inputs (Level 2) [Member]
12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 132R
 -Paragraph 5
 -Subparagraph b

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 132R
 -Paragraph 5
 -Subparagraph d(iv)(b)(i)

Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 87
 -Paragraph 49

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