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Derivative Commodity Instruments (Impact Of Derivative Instruments Not Designated As Fair Value Hedges) (Details) (Commodity Forward Contracts [Member], Derivatives Not Designated As Hedging Instrument [Member], Cost of Sales [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Commodity Forward Contracts [Member] | Derivatives Not Designated As Hedging Instrument [Member] | Cost of Sales [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in Income on Derivative $ 2,043 $ 69 $ 5,347