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Derivatives and Hedging Activities Assets Liabilities Balance Sheet Location (Details) - Foreign Exchange Contract [Member] - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Derivative Asset, Current $ 118 $ 54
Derivative Liability, Current 64 40
Not Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Current 118 54
Not Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Current $ 64 $ 40