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Derivative Financial Instruments (Schedule of Derivatives not Designated as Hedging Instruments) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Other income (expense), net | Foreign currency forward contracts | Derivatives Not Designated as Hedging Instruments        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) on cash flow hedge $ 304 $ 3,794 $ 906 $ 1,939