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COMMITMENTS AND CONTINGENT LIABILITIES (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Leased Assets [Line Items]      
Bank guarantees $ 32,203 $ 25,410  
Income from OCS grants 2,536 1,318 $ 1,092
Damages sought by plaintiff 75,000    
Facilities [Member]      
Operating Leased Assets [Line Items]      
Operating lease expense 4,235 3,797 5,426
Vehicles [Member]      
Operating Leased Assets [Line Items]      
Operating lease expense $ 735 $ 1,175 $ 1,174