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DERIVATIVE INSTRUMENTS (Tables) | 12 Months Ended
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Dec. 31, 2019
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, |  |
| 2019 |  | 2018 |  | 2019 |  | 2018
Option contracts to hedge payroll |  |  |  |  |  |  |
expenses ILS | $ | 16,204 |  |  | $ | 73,950 |  |  | $ | 294 |  |  | $ | (2,566) |
expenses INR | 21,904 |  |  | 40,391 |  |  | 800 |  |  | 807 |
Option contracts to hedge facility expenses ILS | 1,273 |  |  | 5,200 |  |  | 19 |  |  | (137) |
expenses INR | 2,006 |  |  | 3,874 |  |  | 80 |  |  | 80 |
Forward contracts to hedge payroll |  |  |  |  |  |  |
expenses ILS | 67,139 |  |  | 53,500 |  |  | 1,333 |  |  | (1,926) |
expenses INR | 10,032 |  |  | — |  |  | 50 |  |  | — |
expenses PHP | 2,362 |  |  | 4,452 |  |  | 64 |  |  | 187 |
Forward contracts to hedge lease obligations PHP | 4,921 |  |  | — |  |  | — |  |  | — |
Forward contracts to hedge facility expenses ILS | 2,546 |  |  | — |  |  | 67 |  |  | — |
Forward contracts to hedge facility expenses PHP | 433 |  |  | 628 |  |  | 12 |  |  | 28 |
| $ | 128,820 |  |  | $ | 181,995 |  |  | $ | 2,719 |  |  | $ | (3,527) |
Schedule of Fair Value of Derivative Instruments by Balance Sheet Location | The fair value of the Company's outstanding derivative instruments at December 31, 2019 and 2018 is summarized below:
|  |  | Fair value of derivative instruments |  |
|  |  | December 31, |  |
| Balance sheet line item |  | 2019 |  | 2018
Derivative assets: |  |  |  |  |
Foreign exchange option contracts | Prepaid expenses and other current assets |  | $ | 1,194 |  |  | $ | 888 |
Foreign exchange forward contracts | Prepaid expenses and other current assets |  | 1,525 |  |  | 214 |
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, 2019, 2018 and 2017 is summarized below:
| Amount of gain (loss) recognized in other comprehensive income on derivative, net of tax (effective portion) |  |  |  |
| Year Ended December 31, |  |  |  |
| 2019 |  | 2018 |  | 2017
Derivatives in foreign exchange cash flow hedging relationships: |  |  |  |  |
Forward contracts | $ | 2,108 |  |  | $ | (6,059) |  |  | $ | 3,317 |
Option contracts | 3,387 |  |  | (2,571) |  |  | 3,504 |
| $ | 5,495 |  |  | $ | (8,630) |  |  | $ | 6,821 |
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 |  | 2019 |  | 2018 |  | 2017
Option contracts to hedge payroll and facility expenses | Cost of revenues and operating expenses |  | $ | 320 |  |  | $ | 66 |  |  | $ | (2,429) |
Forward contracts to hedge payroll and facility expenses | Cost of revenues, operating expenses and financial expenses |  | (749) |  |  | 4,715 |  |  | (3,157) |
|  |  | $ | (429) |  |  | $ | 4,781 |  |  | $ | (5,586) |

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