Foreign Currency Derivatives - Effect of Derivative Instruments Designated as Cash Flow Hedges in Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Derivative Instruments Gain Loss [Line Items]
Foreign exchange contracts, Gain or (loss) recognized in OCI-effective portion, total		$ (1,627)	$ 6,298
Gain or (loss) reclassified from OCI into income- effective portion, total		(59)	2,558
Gain or (Loss) Recognized-Ineffective Portion and Amount Excluded from Effectiveness Testing	[1]	(9)	(31)
Product revenues
Derivative Instruments Gain Loss [Line Items]
Gain or (loss) reclassified from OCI into income- effective portion, total		1,298	6,636
Cost of revenues
Derivative Instruments Gain Loss [Line Items]
Gain or (loss) reclassified from OCI into income- effective portion, total		(297)	(801)
Sales and marketing
Derivative Instruments Gain Loss [Line Items]
Gain or (loss) reclassified from OCI into income- effective portion, total		(833)	(1,787)
Research and development
Derivative Instruments Gain Loss [Line Items]
Gain or (loss) reclassified from OCI into income- effective portion, total		(47)	(715)
General and administrative
Derivative Instruments Gain Loss [Line Items]
Gain or (loss) reclassified from OCI into income- effective portion, total		(180)	(775)
Interest and other income (expense), net
Derivative Instruments Gain Loss [Line Items]
Gain or (Loss) Recognized-Ineffective Portion and Amount Excluded from Effectiveness Testing	[1]	(9)	(31)
Foreign exchange contract
Derivative Instruments Gain Loss [Line Items]
Foreign exchange contracts, Gain or (loss) recognized in OCI-effective portion, total		$ (1,627)	$ 6,298

[1] There were no gains or losses recognized in income due to ineffectiveness in the periods presented.