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Derivatives, Hedges, Financial Instruments and Carbon Credits (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Total net gains (losses) included in earnings: |  |  |
Derivative instruments and carbon credits, gains and losses recognized in earnings | $ (2,251) | $ (1,561) | $ (2,073)
Derivative instruments and carbon credits change in unrealized gains and losses recognized in earnings | (335) | 844 | 646
Cost of Sales [Member] | Commodities Contracts [Member] |  |  |
Total net gains (losses) included in earnings: |  |  |
Derivative instruments and carbon credits, gains and losses recognized in earnings | 523 | (59) | (1,312)
Derivative instruments and carbon credits change in unrealized gains and losses recognized in earnings | 11 | 761 | 138
Cost of Sales [Member] | Foreign Exchange Contracts [Member] |  |  |
Total net gains (losses) included in earnings: |  |  |
Derivative instruments and carbon credits, gains and losses recognized in earnings | 46 | 25 | (32)
Derivative instruments and carbon credits change in unrealized gains and losses recognized in earnings |  | 49 |
Other Income [Member] | Carbon Credits [Member] |  |  |
Total net gains (losses) included in earnings: |  |  |
Derivative instruments and carbon credits, gains and losses recognized in earnings | 1,995 | 644 |
Derivative instruments and carbon credits change in unrealized gains and losses recognized in earnings | 42 | 644 |
Other Expense [Member] | Contractual obligations relating to carbon credits [Member] |  |  |
Total net gains (losses) included in earnings: |  |  |
Derivative instruments and carbon credits, gains and losses recognized in earnings | (1,844) | (644) |
Derivative instruments and carbon credits change in unrealized gains and losses recognized in earnings | (42) | (644) |
Interest Expense [Member] | Interest Rate Contracts [Member] |  |  |
Total net gains (losses) included in earnings: |  |  |
Derivative instruments and carbon credits, gains and losses recognized in earnings | (1,925) | (1,527) | (729)
Derivative instruments and carbon credits change in unrealized gains and losses recognized in earnings | $ (346) | $ 34 | $ 508

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- Definition The amount of net gains and losses (realized and unrealized) recognized in earnings during the period on derivative instruments and carbon credit assets or carbon credit contractual obligations measured at fair value. + References No definition available. + Details
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- Definition Derivative instruments and carbon credits change in unrealized gains and losses relating to contracts still held at period end. + References No definition available. + Details
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- Details
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