Hedging (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) Derivatives	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Derivatives	Sep. 30, 2015 USD ($) Derivatives	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Derivatives, Fair Value [Line Items]
Maximum Length of Time Hedged in Cash Flow Hedge			2 years
Derivative, Number of New Instruments During Period | Derivatives	9		30	16
Derivative, New Instruments During Period, Notional Amount	$ 3,200		$ 9,800	$ 7,500
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	122	$ 288	714	358
Unrealized loss on hedge instruments	(354)	(894)	(354)	(894)	$ (603)	$ (819)	$ (685)	$ (752)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	127	(497)	(249)	(500)
Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	122
Hedge Loss Recognized in Other Comprehensive Income (Loss)	249	(209)	465	(142)
Cost of Sales [Member]
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	39	75	222	104
Research and Development Expense [Member]
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	60	122	355	171
Selling, General and Administrative Expenses [Member]
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	23	$ 91	137	$ 83
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	265		265			0
Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	0		0			(277)
Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			200
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives	$ 13,912		$ 13,912			$ 14,024
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