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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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