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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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