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Derivative Financial Instruments (Schedule of Effects and Locations of Gains or Losses Recognized in Income) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2018
Jul. 02, 2017
Jul. 01, 2018
Jul. 02, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Net revenue $ 366,820 $ 330,723 $ 711,793 $ 654,380
Cost of revenue 257,648 238,787 498,116 465,512
Research and development 31,371 23,357 60,318 46,040
Sales and marketing 46,983 36,461 90,641 74,690
General and administrative 20,448 12,950 37,086 26,144
Foreign currency forward contracts | Designated as Hedging Instrument | Cash Flow Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [1] 1,556 (932) (636) 648
Foreign currency forward contracts | Designated as Hedging Instrument | Net revenue | Cash Flow Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [1] 1,783 (1,008) (785) 1,027
Foreign currency forward contracts | Designated as Hedging Instrument | Cost of revenue | Cash Flow Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [1] (7) (1) (1) (14)
Foreign currency forward contracts | Designated as Hedging Instrument | Research and development | Cash Flow Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [1] (13) (55) 86 (74)
Foreign currency forward contracts | Designated as Hedging Instrument | Sales and marketing | Cash Flow Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [1] (157) 115 73 (249)
Foreign currency forward contracts | Designated as Hedging Instrument | General and administrative | Cash Flow Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [1] $ (50) $ 17 $ (9) $ (42)
[1] Refer to Note 10, Stockholders' Equity, which summarizes the accumulated other comprehensive income activity related to derivatives.