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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Intangible Assets/Goodwill [Abstract]  
Schedule of intangible assets
   December 31, 
   2016  2017 
 Original amounts:        
          
 Capitalized software costs $71,349  $75,126 
 Customer relationships  53,370   56,296 
 Backlog and non-compete agreement  2,712   2,712 
 Acquired technology  12,375   13,087 
          
    139,806   147,221 
 Accumulated amortization:        
          
 Capitalized software costs  57,286   61,834 
 Customer relationships  21,684   27,967 
 Backlog and non-compete agreement  2,260   2,486 
 Acquired technology  2,396   3,923 
          
    83,626   96,210 
          
 Intangible assets, net $56,180  $51,011
Schedule of estimated future amortization expense of intangible assets
 2018 $11,439 
 2019  9,698 
 2020  8,203 
 2021  6,585 
 2022  4,333 
 2023 and thereafter  10,753 
      
   $51,011