Hedging (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
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	$ 86,000	$ 89,000
Cash Flow Hedge Gain (Loss) Reclassified To Research and Development	142,000	51,000
Cash Flow Hedge Gain (Loss) Reclassified To Selling, General and Administrative	71,000	38,000
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	0	0
Unrealized loss on hedge instruments	(360,000)	(657,000)	(875,000)	(765,000)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	216,000	(70,000)
Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	299,000	178,000
Hedge Loss Recognized in Other Comprehensive Income (Loss)	515,000	108,000
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	(100,000)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	587,000		0
Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value			(169,000)
Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives	12,186,000		15,328,000
Foreign Exchange Forward [Member] | Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	0
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative, Number of New Instruments During Period	0	12
Derivative, New Instruments During Period, Notional Amount	$ 0	$ 2,500,000