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Derivatives (Narrative) (Details) (USD $)
 3 Months Ended
Mar. 29, 2014
month
Mar. 30, 2013
Derivative [Line Items]    
Number of months cash flow hedge gain (loss) reclassified over 12  
Net income/ (loss) $ (51,006,000) $ 32,405,000
Cash Flow Hedging [Member]
    
Derivative [Line Items]    
Cash flow hedge gain (loss) to be reclassified within 12 months (400,000)  
Net income/ (loss) 0  
Forward Contracts [Member] | Commodity Contract [Member]
    
Derivative [Line Items]    
Forward purchase amount $ 5,400,000