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DERIVATIVE INSTRUMENTS (Schedule Of Derivative Instruments) (Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivatives designated as hedging instruments [Member] \| Foreign exchange forward contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other account receivables and prepaid expenses	$ 303	$ 21
Other account payables and accrued expenses		(277)
Other comprehensive income (loss)	303	(256)
Derivatives not designated as hedging instruments [Member] \| Foreign exchange forward contracts and other derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other account receivables and prepaid expenses	148	176
Other account payables and accrued expenses	$ (457)	$ (79)