Hedging (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Maximum Length of Time Hedged in Cash Flow Hedge	2 years
Cash Flow Hedge Gain (Loss) Reclassified to Cost of Sales, Net	$ 89,000	$ (8,000)
Cash Flow Hedge Gain (Loss) Reclassified To Research and Development	51,000	9,000
Cash Flow Hedge Gain (Loss) Reclassified To Selling, General and Administrative	38,000	9,000
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	0	0
Unrealized loss on hedge instruments	(657,000)	(601,000)	(765,000)	(774,000)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(70,000)	163,000
Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	178,000	10,000
Hedge Loss Recognized in Other Comprehensive Income (Loss)	108,000	173,000
Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives	13,966,000		13,986,000
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	(400,000)
Foreign Exchange Forward [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	0		0
Foreign Exchange Forward [Member] | Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	(65,000)		(297,000)
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative, Number of New Instruments During Period	12	21
Derivative, New Instruments During Period, Notional Amount	$ 2,500,000	$ 4,500,000