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SHORT-TERM AND LONG-TERM INVESTMENTS | 12 Months Ended
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Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
SHORT-TERM AND LONG-TERM INVESTMENTS |
NOTE 3:- | SHORT-TERM AND LONG-TERM INVESTMENTS
The following table summarizes amortized costs, gross unrealized gains and losses and estimated fair values of available-for-sale marketable securities as of December 31, 2018 and 2017:
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Estimated fair value (Level 2 within the fair value hierarchy) |
|  | December 31, |  |  | December 31, |  |  | December 31, |  |  | December 31, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Corporate debentures |  | $ | 457,943 |  |  | $ | 189,836 |  |  | $ | 190 |  |  | $ | 9 |  |  | $ | 1,993 |  |  | $ | 908 |  |  | $ | 456,141 |  |  | $ | 188,937 |
U.S. Treasuries |  |  | 21,944 |  |  |  | 7,007 |  |  |  | - |  |  |  | - |  |  |  | 226 |  |  |  | 170 |  |  |  | 21,717 |  |  |  | 6,837 |
U.S. Government Agencies |  |  | 10,854 |  |  |  | 998 |  |  |  | 16 |  |  |  | - |  |  |  | 1 |  |  |  | 1 |  |  |  | 10,869 |  |  |  | 997 |
|  | $ | 490,741 |  |  | $ | 197,841 |  |  | $ | 206 |  |  | $ | 9 |  |  | $ | 2,220 |  |  | $ | 1,079 |  |  | $ | 488,727 |  |  | $ | 196,771 |
The scheduled maturities of available-for-sale marketable securities as of December 31, 2018 are as follows:
|  | Amortized |  |  | Estimated |
|  | cost |  |  | fair value |
Due within one year |  | $ | 244,233 |  |  | $ | 243,729 |
Due after one year through five years |  |  | 246,508 |  |  |  | 244,998 |
|  | $ | 490,741 |  |  | $ | 488,727 |
Investments with continuous unrealized losses for less than 12 months and 12 months or greater and their related fair values as of December 31, 2018 and 2017 are as indicated in the following tables:
|  | December 31, 2018 |
|  | Investments with continuous unrealized losses for less than 12 months |  |  | Investments with continuous unrealized losses for 12 months or greater |  |  | Total Investments with continuous unrealized losses |
|  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |
Corporate debentures |  | $ | 231,845 |  |  | $ | (754 | ) |  | $ | 113,870 |  |  | $ | (1,239 | ) |  | $ | 345,715 |  |  | $ | (1,993 | )
U.S. treasuries |  |  | 14,926 |  |  |  | (12 | ) |  |  | 6,791 |  |  |  | (214 | ) |  |  | 21,717 |  |  |  | (226 | )
U.S. Government agencies |  |  | 7,932 |  |  |  | (1 | ) |  |  | - |  |  |  | - |  |  |  | 7,932 |  |  |  | (1 | )
|  | $ | 254,703 |  |  | $ | (767 | ) |  | $ | 120,661 |  |  | $ | (1,453 | ) |  | $ | 375,364 |  |  | $ | (2,220 | )
|  | December 31, 2017 |
|  | Investments with continuous unrealized losses for less than 12 months |  |  | Investments with continuous unrealized losses for 12 months or greater |  |  | Total Investments with continuous unrealized losses |
|  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |
Corporate debentures |  | $ | 135,252 |  |  | $ | (711 | ) |  | $ | 49,076 |  |  | $ | (198 | ) |  | $ | 184,328 |  |  | $ | (909 | )
U.S. treasuries |  |  | - |  |  |  | - |  |  |  | 6,837 |  |  |  | (170 | ) |  |  | 6,837 |  |  |  | (170 | )
U.S. Government agencies |  |  | 997 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 997 |  |  |  | - |
|  | $ | 136,249 |  |  | $ | (711 | ) |  | $ | 55,913 |  |  | $ | (368 | ) |  | $ | 192,162 |  |  | $ | (1,079 | )

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