Hedging (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 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	$ 169,000	$ 123,000	$ 347,000	$ 191,000
Cash Flow Hedge Gain (Loss) Reclassified To Research and Development	233,000	70,000	335,000	116,000
Cash Flow Hedge Gain (Loss) Reclassified To Selling, General and Administrative	43,000	51,000	119,000	35,000
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	0	0	0	0
Unrealized loss on hedge instruments	(1,646,000)	(666,000)	(1,646,000)	(666,000)	(1,413,000)	(765,000)	(1,447,000)	(774,000)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(678,000)	537,000	(1,682,000)	(234,000)
Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	445,000	244,000	801,000	342,000
Hedge Loss Recognized in Other Comprehensive Income (Loss)	(233,000)	781,000	(881,000)	108,000
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			(1,300,000)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	0		0			0
Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value						(297,000)
Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives	18,922,000		18,922,000			13,986,000
Foreign Exchange Forward [Member] | Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	(989,000)		(989,000)
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative, Number of New Instruments During Period	21	21	33	62
Derivative, New Instruments During Period, Notional Amount	$ 10,300,000	$ 3,300,000	$ 12,800,000	$ 10,200,000