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Derivatives (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 02, 2016
Jul. 04, 2015
Jul. 02, 2016
Jul. 04, 2015
Derivative [Line Items]        
Net income $ 33,991 $ 4,937 $ 36,654 $ 6,761
Commodity Contract [Member]        
Derivative [Line Items]        
Forward purchase amount $ 9,900   9,900  
Cash Flow Hedging [Member]        
Derivative [Line Items]        
Cash flow hedge gain (loss) to be reclassified within 12 months     3,900  
Net income     $ 0