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DERIVATIVE INSTRUMENTS (Tables)
 12 Months Ended
Dec. 31, 2018
General Discussion of Derivative Instruments and Hedging Activities [Abstract]  
Schedule of Notional and Fair Value Amounts of Outstanding Derivative Instruments
   
Notional amount
    
Fair value
(Level 2 within the fair value hierarchy)
  
   
December 31,
    
December 31,
  
   
2018
    
2017
    
2018
    
2017
  
Option contracts to hedge payroll
                        
   expenses ILS
  
$
73,950
    
$
4,000
    
$
(2,566
)
  
$
46
  
   expenses INR
    
40,391
      
17,800
      
807
      
232
  
Option contracts to hedge facility expenses ILS
    
5,200
      
-
      
(137
)
    
-
  
    expenses INR
    
3,874
      
1,846
      
80
      
19
  
Forward contracts to hedge payroll
                                
   expenses ILS
    
53,500
      
30,000
      
(1,926
)
    
947
  
   expenses INR
    
-
      
400
      
-
      
6
  
   expenses PHP
    
4,452
      
-
      
187
      
-
  
Forward contracts to hedge facility expenses PHP
    
628
      
-
      
28
      
-
  
                                 
   
$
181,995
    
$
54,046
    
$
(3,527
)
  
$
1,250
  
Schedule of Fair Value of Derivative Instruments by Balance Sheet Location
The fair value of the Company's outstanding derivative instruments at December 31, 2018 and 2017 is summarized below:

      Fair value of derivative instruments  
      December 31,  
   Balance sheet line item   2018     2017  
Derivative assets:
            
Foreign exchange option contracts
Prepaid expenses and other current assets
  
$
888
    
$
297
  
Foreign exchange forward contracts
Prepaid expenses and other current assets
  
$
214
    
$
953
  
                   
Derivative liabilities:
                  
Foreign exchange option contracts
Accrued expenses and other liabilities
  
$
(2,703
)
  
$
-
  
Foreign exchange forward contracts
Accrued expenses and other liabilities
  
$
(1,926
)
  
$
-
  
Schedule of Effect of Derivative Instruments in Cash Flow Hedging Relationship on Income and Other Comprehensive Income
The effect of derivative instruments in cash flow hedging relationship on income and other comprehensive income for the years ended December 31, 2018, 2017 and 2016 is summarized below:

   
Amount of gain (loss) recognized in
other comprehensive income
on derivative, net of tax (effective portion)
  
   
Year ended
December 31,
  
   
2018
    
2017
    
2016
  
Derivatives in foreign exchange cash flow hedging relationships:
                  
Forward contracts
  
$
(6,059
)
  
$
3,317
    
$
(202
)
Option contracts
    
(2,571
)
    
3,504
      
802
  
                         
   
$
(8,630
)
  
$
6,821
    
$
600
  


Derivatives in foreign exchange cash flow hedging relationships:

      Amount of gain (loss) reclassified from other comprehensive income
into income (expenses),
net of tax (effective portion)		  
 
 
   Year ended
December 31,
  
   Statements of income line item   2018     2017     2016  
                     
Option contracts to hedge payroll and facility expenses
Cost of revenues, operating expenses and discontinued operations
  
$
66
    
$
(2,429
)
  
$
(132
)
Forward contracts to hedge payroll and facility expenses
Cost of revenues and operating expenses
    
4,715
      
(3,157
)
    
-
  
                           
      
$
4,781
    
$
(5,586
)
  
$
(132
)