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COMMITMENTS AND CONTINGENT LIABILITIES (Other Commitments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Agreements With Suppliers To Purchase Licenses And Hosting Services [Member]    
Purchase Commitment, Excluding Long-term Commitment [Line Items]    
Non-cancelable obligations $ 30,831 $ 22,207