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Derivatives (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 04, 2015
Jun. 28, 2014
Jul. 04, 2015
Jun. 28, 2014
Derivative [Line Items]        
Income / (Loss) activity recognized in other comprehensive loss $ (1,800) $ (1,000) $ (1,500) $ 100
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax 700 400 600 100
Net income/(loss) 4,937 $ 34,575 6,761 $ (16,431)
Forward Contracts [Member] | Commodity Contract [Member]        
Derivative [Line Items]        
Forward purchase amount $ 2,500   2,500  
Cash Flow Hedging [Member]        
Derivative [Line Items]        
Cash flow hedge gain (loss) to be reclassified within 12 months     2,000  
Net income/(loss)     $ 0