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DERIVATIVE INSTRUMENTS (Schedule of Outstanding Derivative Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Prepaid expenses and other current assets [Member] | Foreign Exchange Option Contracts [Member]    
Derivative [Line Items]    
Derivative assets $ 297 $ 111
Prepaid expenses and other current assets [Member] | Foreign Exchange Forward Contracts [Member]    
Derivative [Line Items]    
Derivative assets 953 10
Accrued Expenses And Other Liabilities [Member] | Foreign Exchange Option Contracts [Member]    
Derivative [Line Items]    
Derivative liabilities
Accrued Expenses And Other Liabilities [Member] | Foreign Exchange Forward Contracts [Member]    
Derivative [Line Items]    
Derivative liabilities $ (212)