Derivative Financial Instruments (Schedule of Company's Derivative Instruments on Accumulated Other Comprehensive Income and the Consolidated Statement of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivatives designated as hedging instruments | Cash Flow Hedges | Foreign Exchange Forward
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) recognized in other comprehensive income- Effective Portion	$ 1,565	$ 1,416	$ (7,785)
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	1,929	665	(5,786)
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	(12)	(9)	18
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	(57)	83	130
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	(284)	(102)	788
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	(41)	(53)	133
Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) recognized in Other income (expense), net	$ 1,307	$ 3,870	$ (5,085)