Derivatives, Hedges, Financial Instruments and Carbon Credits (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Assets
Beginning balance	$ 42	$ 9	$ 42	$ 644
Transfers into Level 3
Transfers out of Level 3
Total realized and unrealized gains (losses) included in earnings	248	(2)	248	1,028
Purchases
Issuances
Sales	(66)		(66)	(1,665)
Settlements
Ending balance	224	7	224	7
Liabilities
Beginning balance	(42)	(7)	(42)	(644)
Transfers into Level 3
Transfers out of Level 3
Total realized and unrealized gains (losses) included in earnings	(248)		(248)	(936)
Purchases
Issuances
Sales
Settlements	66		66	1,573
Ending balance	$ (224)	$ (7)	$ (224)	$ (7)

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