Derivative Instruments and Hedging Activities - (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Derivative [Line Items]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ 218	$ 300
Derivative, Notional Amount	3,148		$ 3,827
Derivative Asset, Fair Value, Gross Liability	$ 94
Derivative Asset, Fair Value, Gross Asset			$ 312