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Stockholders' Equity (Schedule of Reclassifications out of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2018
Jul. 02, 2017
Jul. 01, 2018
Jul. 02, 2017
Reclassification Out of Accumulated Other Comprehensive Income [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
Tax impact     134 (227)
Amount reclassified from accumulated other comprehensive income, Net of tax     (502) 421
Gain (losses) on cash flow hedge        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Total before tax     (636) 648
Amount Reclassified from AOCI | Gain (losses) on cash flow hedge        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Total before tax 1,556 (932) (636) 648
Tax impact (327) 326 134 (227)
Amount reclassified from accumulated other comprehensive income, Net of tax 1,229 (606) (502) 421
Amount Reclassified from AOCI | Gain (losses) on cash flow hedge | Foreign currency forward contracts        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Net revenue 1,783 (1,008) (785) 1,027
Cost of revenue (7) (1) (1) (14)
Research and development (13) (55) 86 (74)
Sales and marketing (157) 115 73 (249)
General and administrative $ (50) $ 17 $ (9) $ (42)