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Foreign Currency Contracts - Effect on Statement of Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 30, 2017
Sep. 24, 2016
Other income (expense), net | Foreign Currency Forward Contract        
Derivatives, Fair Value [Line Items]        
Gain (loss) recognized $ 0 $ 0 $ 0 $ 3,373