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TAXES ON INCOME (Tables)
 12 Months Ended
Dec. 31, 2017
Income Tax Disclosure [Abstract]  
Reconciliation of Unrecognized Tax Benefits
A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
 
   
2017
    
2016
  
             
Beginning balance
  
$
13,217
    
$
12,306
  
Additions for prior year tax positions
    
290
      
911
  
Decrease for prior year tax positions
    
(1,245
)
    
-
  
Additions for current year tax positions
    
-
      
-
  
Decreases relating to the settlement with tax authorities
    
(10,728
)
    
-
  
                 
Ending balance
  
$
1,534
    
$
13,217
  
Summary of Taxes on Income
Taxes on income are comprised as follows:

   
Year ended
December 31,
  
   
2017
    
2016
    
2015
  
                   
Current taxes
  
$
5,561
    
$
4,338
    
$
5,082
  
Deferred taxes
    
91
      
(2,687
)
    
215
  
                         
   
$
5,652
    
$
1,651
    
$
5,297
  
                         
Domestic
  
$
238
    
$
283
    
$
3,084
  
Foreign
    
5,414
      
1,368
      
2,213
  
                         
   
$
5,652
    
$
1,651
    
$
5,297
  

   
Year ended
December 31,
  
   
2017
    
2016
    
2015
  
Domestic taxes:
                  
                   
Current taxes
  
$
238
    
$
494
    
$
2,715
  
Deferred taxes
    
-
      
(211
)
    
369
  
                         
     
238
      
283
      
3,084
  
Foreign taxes:
                        
                         
Current taxes
    
5,323
      
3,844
      
2,367
  
Deferred taxes
    
91
      
(2,476
)
    
(154
)
                         
     
5,414
      
1,368
      
2,213
  
                         
   
$
5,652
    
$
1,651
    
$
5,297
  
Significant Components of Deferred Tax Liabilities and Assets
Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of the Company's and its subsidiaries' deferred tax liabilities and assets are as follows:

   
December 31,
  
   
2017
    
2016
  
             
Carryforward tax losses
  
$
8,280
    
$
2,210
  
Deferred revenues
    
6,598
      
5,764
  
Temporary differences
    
5,216
      
5,881
  
Unrealized losses on marketable securities
    
132
      
7
  
Intangible assets
    
-
      
36
  
                 
Deferred tax assets before valuation allowance
    
20,226
      
13,898
  
Valuation allowance
    
(5,121
)
    
(1,495
)
                 
Net deferred tax asset
    
15,105
      
12,403
  
                 
Intangible assets, including goodwill
    
(5,646
)
    
(2,997
)
Depreciable assets
    
(2,008
)
    
(1,989
)
                 
Deferred tax liability
    
(7,654
)
    
(4,986
)
                 
Net deferred tax assets
  
$
7,451
    
$
7,417
  

The net change in the total valuation allowance for the year ended December 31, 2017 was mainly relates to the losses carryforwards of the Israeli subsidiaries that the Company concluded that it is not more likely than not that the net deferred tax assets will be realized and therefore a valuation allowance has been recorded against these assets.

   
December 31,
  
   
2017
    
2016
  
             
Domestic deferred tax asset, net
  
$
1,359
    
$
1,233
  
Foreign deferred tax asset, net
    
6,092
      
6,184
  
                 
   
$
7,451
    
$
7,417
  
Reconciliation Between Theoretical and Actual Tax Expense
A reconciliation between the theoretical tax expense, assuming all income is taxed at the statutory tax rate applicable to income of the Company and the actual tax expense as reported in the statement of operations is as follows:

   
Year ended
December 31,
  
   
2017
    
2016
    
2015
  
                   
Income (loss) before taxes, as reported in the consolidated statements of income
  
$
(1,841
)
  
$
(7,008
)
  
$
23,866
  
                         
Statutory tax rate
    
24
%
    
25
%
    
26.5
%
Theoretical tax expense (benefit) on the above amount at the Israeli statutory tax rate
  
$
(442
)
  
$
(1,752
)
  
$
6,324
  
Tax adjustment in respect of different tax rate of foreign subsidiary
    
334
      
427
      
622
  
Non-deductible expenses and other permanent differences
    
375
      
200
      
322
  
Deferred taxes on losses for which valuation allowance was provided, net
    
1,288
      
463
      
377
  
Utilization of tax losses and deferred taxes  for which valuation allowance was provided, net
    
(709
)
    
-
      
(555
)
Stock compensation relating to stock options per ASC No. 718
    
1,976
      
1,342
      
1,186
  
Income taxes in respect of prior years
    
(1,038
)
    
-
      
-
  
Change of Federal tax rate
    
3,249
      
-
      
-
  
Approved, Privileged and Preferred enterprise loss (benefits) (*)
    
347
      
916
      
(3,047
)
Other
    
272
      
55
      
68
  
                         
Actual tax expense
  
$
5,652
    
$
1,651
    
$
5,297
  
 
(*)      Basic earnings per share amounts of the benefit resulting from the "Approved, Privileged and Preferred Enterprise" status
  
$
0.00
    
$
0.03
    
$
0.07
  
                         
Diluted earnings per share amounts of the benefit resulting from the "Approved, Privileged and Preferred Enterprise" status
  
$
0.00
    
$
0.03
    
$
0.06
  
 
Schedule of Income Before Income Taxes
Income (loss) before income taxes is comprised as follows:

   
Year ended
December 31,
  
   
2017
    
2016
    
2015
  
                   
Domestic
  
$
(5,918
)
  
$
(11,475
)
  
$
20,247
  
Foreign
    
4,077
      
4,467
      
3,619
  
                         
Income (loss) before income taxes
  
$
(1,841
)
  
$
(7,008
)
  
$
23,866