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USD ($)

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USD ($)

USD ($) / shares

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 -Name Accounting Principles Board Opinion (APB)
 -Number 12
 -Paragraph 5

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
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 -Paragraph 5
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 14
 -Article 5

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 12
 -Paragraph 5
 -Subparagraph b, c

Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
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 -Paragraph 8
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 -Publisher AICPA
 -Name Accounting Principles Board Opinion (APB)
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 -Name Accounting Principles Board Opinion (APB)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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 -Name Statement of Financial Accounting Standard (FAS)
 -Number 142
 -Paragraph 45
 -Subparagraph a(1)

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USD ($)
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 -Number 142
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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 -Publisher AICPA
 -Name Accounting Principles Board Opinion (APB)
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12/31/2010
USD ($)
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USD ($)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
 -Name Accounting Principles Board Opinion (APB)
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 -Paragraph 5
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
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 -Paragraph 14
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12/31/2009
USD ($)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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 -Subparagraph a
 -Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 12
 -Paragraph 5
 -Subparagraph b, c

Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 03
 -Paragraph 8
 -Article 7

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
 -Name Accounting Principles Board Opinion (APB)
 -Number 12
 -Paragraph 5
 -Subparagraph c

Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
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 -Paragraph 14
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
 -Name Accounting Principles Board Opinion (APB)
 -Number 12
 -Paragraph 5
 -Subparagraph c

Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
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 -Number 210
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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