Marketable Securities - Schedule of Derivatives Not Designated as Cash Flow Hedges (Details) - Cash Flow Hedges [Member] - Not Designated As Hedging Instrument [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Asset Derivatives		$ 46
Other Current Liabilities [Member]
Derivative [Line Items]
Liability Derivatives	$ 166
Foreign Exchange Forward [Member] | Other Current Assets [Member]
Derivative [Line Items]
Asset Derivatives		$ 46
Foreign Exchange Forward [Member] | Other Current Liabilities [Member]
Derivative [Line Items]
Liability Derivatives	$ 166