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DERIVATIVE INSTRUMENTS (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]    
Notional amount $ 54,046 $ 110,149
Fair value 1,250 (91)
Option Contracts To Hedge Payroll Expenses ILS [Member] | Fair Value Inputs Level 2 [Member]    
Derivative [Line Items]    
Notional amount 4,000 43,600
Fair value 46 107
Option Contracts To Hedge Payroll Expenses INR [Member] | Fair Value Inputs Level 2 [Member]    
Derivative [Line Items]    
Notional amount 17,800 12,000
Fair value 232 4
Option Contracts to Hedge Facility Expenses INR [Member] | Fair Value Inputs Level 2 [Member]    
Derivative [Line Items]    
Notional amount 1,846
Fair value 19
Forward Contracts to Hedge Payroll Expenses ILS [Member] | Fair Value Inputs Level 2 [Member]    
Derivative [Line Items]    
Notional amount 30,000 52,000
Fair value 947 (212)
Forward Contracts to Hedge Payroll Expenses INR [Member] | Fair Value Inputs Level 2 [Member]    
Derivative [Line Items]    
Notional amount 400
Fair value 6
Forward Contracts to Hedge Facility Expenses ILS [Member] | Fair Value Inputs Level 2 [Member]    
Derivative [Line Items]    
Notional amount 2,549
Fair value $ 10