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SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2018
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 periods ranges:
 
 
Years
   
Computers and peripheral equipment
3 - 5
Office furniture and equipment
  5 - 14
Internal use software
3
Schedule of Other Intangible Assets Depreciation Rates
Other intangible assets are amortized over their estimated useful lives using the straight-line method, at the following annual periods ranges:

   
Years
     
Core technology
  
2 – 8
Customer relationships
  
3 - 8
Trademarks
  
  2 - 12
Customer backlog
  
2 - 3
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, 2018 and 2017:

   
Year ended
December 31, 2018
  
   
Unrealized losses on marketable securities
    
Unrealized gains (losses) on cash flow hedges
    
Foreign currency translation adjustment
    
Total
  
                         
Beginning balance
  
$
(1,070
)
  
$
1,134
    
$
(32,978
)
  
$
(32,914
)
                                 
Other comprehensive income (loss) before reclassifications
    
(592
)
    
(8,630
)
    
(9,261
)
    
(18,483
)
Amounts reclassified from accumulated other comprehensive income
    
-
      
4,781
      
-
      
4,781
  
                                 
Net current-period other comprehensive income (loss)
    
(592
)
    
(3,849
)
    
(9,261
)
    
(13,702
)
                                 
Ending balance
  
$
(1,662
)
  
$
(2,715
)
  
$
(42,239
)
  
$
(46,616
)
 
   
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
)
Accounting Standards Update 2014-09 [Member]  
Schedule of Cumulative Effects of Applying New Accounting Pronouncements
Select consolidated balance sheet line items, which reflect the adoption impact of the new standard, are as follows:
 
   
December 31, 2018
  
   
As Reported
    
Balances without adoption of ASC 606
    
Effect of Change Higher (Lower)
  
                   
Assets:
                  
Prepaid expenses and other current assets
  
$
87,450
    
$
91,671
    
$
(4,221
)
Other long-term assets
    
74,042
      
16,367
      
57,675
  
Deferred tax assets
    
12,309
      
12,356
      
(47
)
                         
Liabilities:
                        
Deferred revenues and advances from customers
    
(256,499
)
    
(285,367
)
    
28,868
  
Accrued expenses and other liabilities
    
(373,908
)
    
(368,681
)
    
(5,227
)
Deferred tax liabilities
    
(44,140
)
    
(32,125
)
    
(12,015
)
Shareholders' Equity:
  
$
2,016,613
    
$
1,951,580
    
$
65,033
Accounting Standards Update 2016-18 [Member]  
Schedule of Cumulative Effects of Applying New Accounting Pronouncements
In accordance with ASC 606, the disclosure of the impact for the adoption of ASC 606 on the consolidated statement of income was as follows:

   
Year ended
December 31, 2018
  
   
As Reported
    
Amounts without adoption of
ASC 606
    
Effect of Change
Higher (Lower)
  
Consolidated Statement of Income:
                  
Total revenues
  
$
1,444,519
    
$
1,453,762
    
$
(9,243
)
Cost of revenues
    
496,815
      
497,479
      
(664
)
Selling and marketing
    
370,659
      
384,142
      
(13,483
)
Taxes on income
    
27,377
      
26,347
      
1,030
  
Net income
    
159,338
      
155,464
      
3,874
  
Earnings per share:
                        
   Basic
  
$
2.60
    
$
2.53
    
$
(0.07
)
   Diluted
  
$
2.52
    
$
2.46
    
$
(0.06
)