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DERIVATIVE INSTRUMENTS (Schedule of Fair Value of Derivative Contracts) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Other accounts receivable and prepaid expenses [Member]    
Derivative [Line Items]    
Total derivatives $ 1,937 $ 373
Other accounts payable and accrued expenses [Member]    
Derivative [Line Items]    
Total derivatives 281 112
Derivatives designated as hedging instruments [Member] | Currency forward contracts [Member]    
Derivative [Line Items]    
Total derivatives 35,089 29,621
Derivatives designated as hedging instruments [Member] | Currency forward contracts [Member] | Other accounts receivable and prepaid expenses [Member]    
Derivative [Line Items]    
Total derivatives 1,847 318
Derivatives designated as hedging instruments [Member] | Currency forward contracts [Member] | Other accounts payable and accrued expenses [Member]    
Derivative [Line Items]    
Total derivatives 2
Derivatives not designated as hedging instruments [Member] | Currency forward and option contracts [Member]    
Derivative [Line Items]    
Total derivatives 31,207 28,532
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 90 55
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 $ 279 $ 112