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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

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