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1/1/2010 - 12/31/2010
USD ($)

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1/1/2009 - 12/31/2009
USD ($)
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1/1/2008 - 12/31/2008
USD ($)
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 -Name Statement of Financial Accounting Standard (FAS)
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 -Paragraph 45
 -Subparagraph a(2)

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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 142
 -Paragraph 12, 13, 14

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