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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
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12/31/2010
USD ($)
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{us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : Pension Benefits [Member]
12/31/2009
USD ($)
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{us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : Other Benefits [Member]
12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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 -Number 132R
 -Paragraph 5
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12/31/2010
USD ($)
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{us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : Other Benefits [Member]
12/31/2009
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 132R
 -Paragraph 5
 -Subparagraph c

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