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USD ($) / shares

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USD ($)

USD ($) / shares
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USD ($)

USD ($) / shares

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1/1/2010 - 12/31/2010
USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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USD ($)
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 -Name Statement of Financial Accounting Standard (FAS)
 -Number 131
 -Paragraph 32
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1/1/2010 - 12/31/2010
USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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{us-gaap_SegmentReportingOtherSignificantReconcilingItemByNameAxis} : Phase-Out And Start-Up Costs [Member]
1/1/2008 - 12/31/2008
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 131
 -Paragraph 32
 -Subparagraph b

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{us-gaap_SegmentReportingOtherSignificantReconcilingItemByNameAxis} : Impairment and Restructuring Charges [Member]
1/1/2010 - 12/31/2010
USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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{us-gaap_SegmentReportingOtherSignificantReconcilingItemByNameAxis} : Impairment and Restructuring Charges [Member]
1/1/2008 - 12/31/2008
USD ($)
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 -Name Statement of Financial Accounting Standard (FAS)
 -Number 131
 -Paragraph 32
 -Subparagraph b

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USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 131
 -Paragraph 32
 -Subparagraph b

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 -Name Statement of Financial Accounting Standard (FAS)
 -Number 131
 -Paragraph 32
 -Subparagraph b

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 -Name Statement of Financial Accounting Standard (FAS)
 -Number 131
 -Paragraph 32
 -Subparagraph b

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