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Transfers into liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

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-Section 50

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

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Derivatives, Hedges, Financial Instruments and Carbon Credits (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Assets
Beginning balance	$ 42	$ 11	$ 42	$ 644
Transfers into Level 3
Transfers out of Level 3
Total realized and unrealized gains (losses) included in earnings		990		1,030
Purchases
Issuances
Sales		(992)		(1,665)
Settlements
Ending balance	42	9	42	9
Liabilities
Beginning balance	(42)		(42)	(644)
Transfers into Level 3
Transfers out of Level 3
Total realized and unrealized gains (losses) included in earnings		(896)		(936)
Purchases
Issuances
Sales
Settlements		889		1,573
Ending balance	$ (42)	$ (7)	$ (42)	$ (7)