Hedging (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Cash Flow Hedge Gain (Loss) Reclassified to Cost of Sales, Net	$ 498,000	$ 286,000	$ 41,000
Cash Flow Hedge Gain (Loss) Reclassified To Research and Development	544,000	183,000	322,000
Cash Flow Hedge Gain (Loss) Reclassified To Selling, General and Administrative	158,000	87,000	123,000
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	0	0	0
Beginning balance of unrealized loss on forward exchange contracts	(765,000)	(774,000)	393,000
Other comprehensive loss before reclassifications	(1,310,000)	(547,000)	(1,653,000)
Amounts reclassified from other comprehensive income	1,200,000	556,000	486,000
Other comprehensive income (loss)	(110,000)	9,000	(1,167,000)
Ending balance of unrealized loss on forward exchange contracts	(875,000)	(765,000)	(774,000)
Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives	15,328,000	13,986,000
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	(800,000)
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		(297,000)
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	12,800,000	13,300,000
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	$ (169,000)