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 -Subparagraph b(1)(b)

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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 133
 -Paragraph 45
 -Subparagraph b(1)

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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 133
 -Paragraph 45
 -Subparagraph a(1)

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1/1/2010 - 12/31/2010
USD ($)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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 -Name Statement of Financial Accounting Standard (FAS)
 -Number 133
 -Paragraph 44C
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1/1/2010 - 12/31/2010
USD ($)
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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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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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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
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{us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis} : Fuel [Member]
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 133
 -Paragraph 45
 -Subparagraph b(1)(b)

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 -Name Statement of Financial Accounting Standard (FAS)
 -Number 133
 -Paragraph 45
 -Subparagraph b(1)(b)

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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 133
 -Paragraph 45
 -Subparagraph b(1)(b)

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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
 -Clause 3

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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
 -Clause 3

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