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DERIVATIVE INSTRUMENTS (Schedule of Fair Value of Derivative Contracts) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Other accounts receivable and prepaid expenses [Member]    
Derivative [Line Items]    
Total derivatives $ 599 $ 5
Other accounts payable and accrued expenses [Member]    
Derivative [Line Items]    
Total derivatives 139 1,033
Derivatives designated as hedging instruments [Member] | Currency forward contracts [Member] | Other accounts receivable and prepaid expenses [Member]    
Derivative [Line Items]    
Total derivatives 545 3
Derivatives designated as hedging instruments [Member] | Currency forward contracts [Member] | Other accounts payable and accrued expenses [Member]    
Derivative [Line Items]    
Total derivatives 587
Derivatives not designated as hedging instruments [Member] | Currency forward and option contracts [Member] | Other accounts receivable and prepaid expenses [Member]    
Derivative [Line Items]    
Total derivatives 54 2
Derivatives not designated as hedging instruments [Member] | Currency forward and option contracts [Member] | Other accounts payable and accrued expenses [Member]    
Derivative [Line Items]    
Total derivatives $ 139 $ 446