Current report of foreign issuer pursuant to Rules 13a-16 and 15d-16 Amendments

Fair Value Measurement (Schedule of Fair Value Measurements) (Details)

v3.8.0.1
Fair Value Measurement (Schedule of Fair Value Measurements) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities $ (978) $ (568)
Foreign Exchange Future [Member] | Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 158 90
Derivative liabilities (1,140) (921)
Foreign Exchange Future Two [Member] | Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 24 263
Derivative liabilities $ (20)