Hedging (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) Derivatives	Sep. 30, 2014 USD ($) Derivatives	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Derivatives, Fair Value [Line Items]
Maximum Length of Time Hedged in Cash Flow Hedge			2 years
Derivative, Number of New Instruments During Period | Derivatives			16	18
Derivative, New Instruments During Period, Notional Amount			$ 7,500	$ 11,600
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	$ 288	$ 87	358	484
Unrealized loss on hedge instruments	(894)	(723)	(894)	(723)	$ (685)	$ (752)	$ (268)	$ (875)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(497)	(542)	(500)	(332)
Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	288
Hedge Loss Recognized in Other Comprehensive Income (Loss)	(209)	(455)	(142)	152
Cost of Sales [Member]
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	75	25	104	138
Research and Development Expense [Member]
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	122	41	171	228
Selling, General and Administrative Expenses [Member]
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	91	$ 21	83	$ 118
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	(343)		(343)			(83)
Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			(700)
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives	$ 12,441		$ 12,441			$ 14,193
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative, Number of New Instruments During Period | Derivatives			18
Derivative, New Instruments During Period, Notional Amount			$ 11,600