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Derivatives, Hedges, Financial Instruments and Carbon Credits (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Assets
Beginning balance	$ 42	$ 644
Transfers into Level 3
Transfers out of Level 3
Total realized and unrealized gains (loss) included in earnings		40
Purchases
Issuances
Sales		(673)
Settlements
Ending balance	42	11
Liabilities
Beginning balance	(42)	(644)
Transfers into Level 3
Transfers out of Level 3
Total realized and unrealized gains (loss) included in earnings		(40)
Purchases
Issuances
Sales
Settlements		684
Ending balance	$ (42)

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This element represents issuances which have taken place during the period in relation to assets measured at fair value on a recurring basis using unobservable inputs (Level 3).

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No definition available.

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- Definition

This element represents purchases which have taken place during the period in relation to assets measured at fair value on a recurring basis using unobservable inputs (Level 3).

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No definition available.

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- Definition

This element represents sales which have taken place during the period in relation to assets measured at fair value on a recurring basis using unobservable inputs (Level 3).

+ References

No definition available.

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- Definition

This element represents settlements which have taken place during the period in relation to assets measured at fair value on a recurring basis using unobservable inputs (Level 3).

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No definition available.

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- Definition

This element represents transfers into assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

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No definition available.

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- Definition

This element represents transfers out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

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No definition available.

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- Definition

This element represents purchases which have taken place during the period in relation to liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3).

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No definition available.

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- Definition

This element represents sales which have taken place during the period in relation to liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3).

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No definition available.

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- Definition

This element represents settlements which have taken place during the period in relation to liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3).

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- Definition

This element represents transfers into liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

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No definition available.

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- Definition

This element represents issuances which have taken place during the period in relation to liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3).

+ References

No definition available.

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- Definition

This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

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-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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- Definition

This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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- Definition

This element represents total gains or losses for the period (realized and unrealized), arising from liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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- Definition

This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

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-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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