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Revenue Recognition (Tables)
 6 Months Ended
Jun. 30, 2018
Revenue Recognition  
Schedule of estimated revenue expected to recognized future periods related to performance obligations
     Remainder of
2018		   2019   2020   2021 and
 thereafter		 
  Software license and related revenues and consulting services  $2,661   $4,946   $4,824   $769 
Schedule of trade receivables, contract assets and contract liabilities from contracts with customers

    

June 30,
2018
(unaudited)

 
  Trade receivables  $75,584 
  Accrued revenues (short and long-term contract assets)   13,529 
  Deferred revenues (short-term contract liabilities)   9,082 
Schedule of condensed interim consolidated statements of income and balance sheets
    

Six months ended
June 30, 2018

 
     ASC 606   ASC 605   impact 
         Unaudited     
  Revenue  $1,252   $50   $1,202