Foreign Currency Derivatives (Effect Of Derivative Instruments Designated As Cash Flow Hedges In Condensed Consolidated Statements Of Operations) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized (loss) gain on hedging securities	$ 1,444,000		$ 4,046,000		$ (2,563,000)
Gain or (Loss) Reclassified from OCI into Income- Effective Portion	(2,860,000)		4,522,000
(Loss) Recognized-Ineffective Portion and Amount Excluded from Effectiveness Testing	400,000
Gain or (Loss) Recognized-Ineffective Portion and Amount Excluded from Effectiveness Testing	(378,000)	[1]	70,000	[1]
Gain (loss) recorded for excluded time value portion of hedge			100,000
Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain Recognized in OCI-Effective Portion	1,444,000		4,046,000
Product Revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain Reclassified from OCI into Income- Effective Portion			6,223,000
(Loss) Reclassified from OCI into Income- Effective Portion	(7,113,000)
Stock-Based Compensation Expense Included In Cost Of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain Reclassified from OCI into Income- Effective Portion	388,000
(Loss) Reclassified from OCI into Income- Effective Portion			(269,000)
Sales And Marketing [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain Reclassified from OCI into Income- Effective Portion	2,979,000
(Loss) Reclassified from OCI into Income- Effective Portion			(1,729,000)
Research And Development [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain Reclassified from OCI into Income- Effective Portion	493,000		359,000
General And Administrative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain Reclassified from OCI into Income- Effective Portion	393,000
(Loss) Reclassified from OCI into Income- Effective Portion			(62,000)
Interest And Other Income (Expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) Recognized-Ineffective Portion and Amount Excluded from Effectiveness Testing	(378,000)	[1]
Gain Recognized-Ineffective Portion and Amount Excluded from Effectiveness Testing			$ 70,000	[1]

[1] For the year ended December 31, 2011, no gain/loss was recorded for the ineffective portion and a $0.4 million loss was recorded for the excluded time value portion of the hedge. For the year ended December 31, 2010, no gain/loss was recorded for the ineffective portion and a $0.1 million gain was recorded for the excluded time value portion of the hedge.