Hedging (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Derivatives, Fair Value [Line Items]
Hedge Loss Recognized in Other Comprehensive Income (Loss)	$ 9,000	$ (1,167,000)	$ (354,000)
Cash Flow Hedge Gain (Loss) Reclassified to Cost of Sales, Net	286,000	41,000	104,000
Cash Flow Hedge Gain (Loss) Reclassified To Research and Development	183,000	322,000	705,000
Cash Flow Hedge Gain (Loss) Reclassified To Selling, General and Administrative	87,000	123,000	162,000
Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives	13,986,000	15,480,000
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	(300,000)
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		(647,000)
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative, Number of New Instruments During Period	0	0
Derivative, New Instruments During Period, Notional Amount	13,300,000	12,700,000
Hedge Loss Recognized in Other Comprehensive Income (Loss)		(1,167,000)	(354,000)
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Exchange Forward [Member] | Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	$ (297,000)