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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 Instruments [Member], Cost Of Sales [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Commodity Forward Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Cost Of Sales [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income on Derivative $ 560 $ (16)