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SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Schedule of Property and Equipment Depreciation Rates
Depreciation is calculated using the straight-line method over the estimated useful lives of the assets, at the following annual rates:
 
 
%
   
Computers and peripheral equipment
20 - 33
Office furniture and equipment
7 - 20
Internal use software
33
Schedule of Other Intangible Assets Depreciation Rates
Intangible assets are amortized over their estimated useful lives using the straight-line method, at the following annual rates ranges:

 
%
   
Core technology
12.5 - 50
Customer relationships
14.7 - 33.3
Trademarks
12.5 - 50
Customer backlog
50 - 100
Schedule of Accumulated Other Comprehensive Income, Net
The following tables show the components of accumulated other comprehensive income, net of taxes, as of December 31, 2017 and 2016:

   
Year ended December 31, 2017
  
   
Unrealized losses on marketable securities
    
Unrealized gains (losses) on cash flow hedges
    
Foreign currency translation adjustment
    
Total
  
                         
Beginning balance
  
$
(216
)
  
$
(101
)
  
$
(46,507
)
  
$
(46,824
)
                                 
Other comprehensive income (loss) before reclassifications
    
(854
)
    
6,821
      
13,529
      
19,496
  
Amounts reclassified from accumulated other comprehensive income
    
-
      
(5,586
)
    
-
      
(5,586
)
                                 
Net current-period other comprehensive income (loss)
    
(854
)
    
1,235
      
13,529
      
13,910
  
                                 
Ending balance
  
$
(1,070
)
  
$
1,134
    
$
(32,978
)
  
$
(32,914
)
 
   
Year ended December 31, 2016
  
   
Unrealized gains (losses) on marketable securities
    
Unrealized gains (losses) on cash flow hedges
    
Foreign currency translation adjustment
    
Total
  
                         
Beginning balance
  
$
(1,930
)
  
$
(569
)
  
$
(21,706
)
  
$
(24,205
)
                                 
Other comprehensive income (loss) before reclassifications
    
5,102
      
600
      
(24,801
)
    
(19,099
)
Amounts reclassified from accumulated other comprehensive income
    
(3,388
)
    
(132
)
    
-
      
(3,520
)
                                 
Net current-period other comprehensive income (loss)
    
1,714
      
468
      
(24,801
)
    
(22,619
)
                                 
Ending balance
  
$
(216
)
  
$
(101
)
  
$
(46,507
)
  
$
(46,824
)