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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]    
Purchase Obligation, Due in Next Twelve Months $ 55,000  
Purchase Obligation, Due in Next Twelve Months 0  
Letters of Credit Outstanding, Amount $ 39,600 $ 44,300