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FAIR VALUE MEASUREMENT (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value Disclosures [Abstract]    
Notional amount of open forward contracts $ 1,017 $ 10,332
Notional amount of open call options 3,781  
Notional amount of open put options $ 3,957