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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)

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