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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 133
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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 -Name Statement of Financial Accounting Standard (FAS)
 -Number 133
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 133
 -Paragraph 44C
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USD ($)
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USD ($)
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 -Name Statement of Financial Accounting Standard (FAS)
 -Number 133
 -Paragraph 205G

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 133
 -Paragraph 44C
 -Subparagraph b
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1/1/2011 - 3/31/2011
USD ($)
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USD ($)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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1/1/2011 - 3/31/2011
USD ($)
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1/1/2010 - 3/31/2010
USD ($)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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 -Name Statement of Financial Accounting Standard (FAS)
 -Number 133
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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1/1/2011 - 3/31/2011
USD ($)
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1/1/2010 - 3/31/2010
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 133
 -Paragraph 205G

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 133
 -Paragraph 44C
 -Subparagraph b

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