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Derivatives, Hedges, Financial Instruments and Carbon Credits (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Assets
Beginning balance	$ 644	$ 0	$ 0
Transfers into Level 3	0	0	0
Transfers out of Level 3	0	0	0
Total realized and unrealized gains (losses) included in earnings	1,995	644	0
Purchases	0	0	0
Issuances	0	0	0
Sales	(2,597)	0	0
Settlements	0	0	0
Ending balance	42	644	0
Liabilities
Beginning balance	(644)	0	(1,388)
Transfers into Level 3	0	0	0
Transfers out of Level 3	0	0	0
Total realized and unrealized gains (losses) included in earnings	(1,844)	(644)	493
Purchases	0	0	0
Issuances	0	0	0
Sales	0	0	0
Settlements	2,446	0	895
Ending balance	$ (42)	$ (644)	$ 0

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- Definition

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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.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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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

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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.

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