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SIGNIFICANT ACCOUNTING POLICIES (Schedule of Financial Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets | $ 547,131 | $ 337,947
Total financial liabilities | 696 | 2,596
Foreign currency derivative contracts liabilities [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets |  | 2,596
Total financial liabilities | 696 |
Money Market Funds [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets | 204,067 | 265,157
Government and corporate debentures - fixed interest rate [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets | 284,321 | 69,217
Government Sponsored Enterprises Less Than A Year [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets | 30,132 |
Government and corporate debentures - floating interest rate [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets | 27,146 | 1,000
Foreign currency derivative contracts assets [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets | 1,465 | 2,573
Level 1 [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets | 204,067 | 265,157
Total financial liabilities |  |
Level 1 [Member] | Money Market Funds [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets | 204,067 | 265,157
Level 1 [Member] | Government and corporate debentures - fixed interest rate [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets |  |
Level 1 [Member] | Government-sponsored enterprises [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets |  |
Level 1 [Member] | Government and corporate debentures - floating interest rate [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets |  |
Level 1 [Member] | Foreign currency derivative contracts assets [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets |  |
Level 2 [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets | 343,064 | 72,790
Total financial liabilities | 696 | 2,596
Level 2 [Member] | Foreign currency derivative contracts liabilities [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets |  | 2,596
Total financial liabilities | 696 |
Level 2 [Member] | Money Market Funds [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets |  |
Level 2 [Member] | Government and corporate debentures - fixed interest rate [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets | 284,321 | 69,217
Level 2 [Member] | Government-sponsored enterprises [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets | 30,132 |
Level 2 [Member] | Government and corporate debentures - floating interest rate [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets | 27,146 | 1,000
Level 2 [Member] | Foreign currency derivative contracts assets [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets | 1,465 | 2,573
Level 3 [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets |  |
Total financial liabilities |  |
Level 3 [Member] | Money Market Funds [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets |  |
Level 3 [Member] | Government and corporate debentures - fixed interest rate [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets |  |
Level 3 [Member] | Government-sponsored enterprises [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets |  |
Level 3 [Member] | Government and corporate debentures - floating interest rate [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets |  |
Level 3 [Member] | Foreign currency derivative contracts assets [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total financial assets |  |

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