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Derivative Instruments (Impact of Derivative Instruments Not Designated as Fair Value Hedges) (Details) (Derivatives Not Designated As Hedging Instruments, Commodity Forward Contracts, Cost of Sales, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivatives Not Designated As Hedging Instruments \| Commodity Forward Contracts \| Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	$ 249	$ 371	$ (783)	$ 838

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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