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Derivatives, Hedges, Financial Instruments and Carbon Credits (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	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.

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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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