Derivative Financial Instruments (Schedule of Company's Derivative Instruments on Accumulated Other Comprehensive Income and the Unaudited Condensed Consolidated Statement of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Derivatives designated as hedging instruments | Cash Flow Hedges | Foreign Exchange Forward
Derivative Instruments, Gain (Loss) [Line Items]
Gains recognized in accumulated other comprehensive income- Effective Portion	$ 985	$ 329
Derivatives designated as hedging instruments | Cash Flow Hedges | Foreign Exchange Forward | Net revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive income into Income -Effective Portion	676	414
Derivatives designated as hedging instruments | Cash Flow Hedges | Foreign Exchange Forward | Cost of revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive income into Income -Effective Portion	(2)	(2)
Derivatives designated as hedging instruments | Cash Flow Hedges | Foreign Exchange Forward | Research and development
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive income into Income -Effective Portion	(2)	(26)
Derivatives designated as hedging instruments | Cash Flow Hedges | Foreign Exchange Forward | Sales and marketing
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive income into Income -Effective Portion	(77)	(69)
Derivatives designated as hedging instruments | Cash Flow Hedges | Foreign Exchange Forward | General and administrative
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive income into Income -Effective Portion	(13)	(11)
Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gains recognized in Other income (expense), net	$ 1,778	$ 602