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SHORT-TERM AND LONG-TERM INVESTMENTS | 12 Months Ended
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Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
SHORT-TERM AND LONG-TERM INVESTMENTS | SHORT-TERM AND LONG-TERM INVESTMENTS Short-term and long-term investments include marketable securities in the amount of $735,717 and $488,727 as of December 31, 2019 and 2018, respectively and short-term bank deposits in the amounts of $17,444 as of December 31, 2019. 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, 2019 and 2018:
| 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, |  |
| 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Corporate debentures | $ | 687,886 |  |  | $ | 457,944 |  |  | $ | 4,865 |  |  | $ | 190 |  |  | $ | (271) |  |  | $ | (1,993) |  |  | $ | 692,480 |  |  | $ | 456,141 |
U.S. Treasuries | 23,182 |  |  | 21,943 |  |  | 82 |  |  | — |  |  | (2) |  |  | (226) |  |  | 23,262 |  |  | 21,717 |
U.S. Government Agencies | 19,957 |  |  | 10,854 |  |  | 38 |  |  | 16 |  |  | (20) |  |  | (1) |  |  | 19,975 |  |  | 10,869 |
| $ | 731,025 |  |  | $ | 490,741 |  |  | $ | 4,985 |  |  | $ | 206 |  |  | $ | (293) |  |  | $ | (2,220) |  |  | $ | 735,717 |  |  | $ | 488,727 |
The scheduled maturities of available-for-sale marketable securities as of December 31, 2019 are as follows:
| Amortized cost |  | Estimated fair value
Due within one year | $ | 192,882 |  |  | $ | 193,328 |
Due after one year through five years | 538,142 |  |  | 542,389 |
| $ | 731,025 |  |  | $ | 735,717 |
Investments with continuous unrealized losses for less than 12 months and 12 months or greater and their related fair values as of December 31, 2019 and 2018 are as indicated in the following tables:
| December 31, 2019 |  |  |  |  |  |  |  |  |  |
| 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 | $ | 70,733 |  |  | $ | (117) |  |  | $ | 48,658 |  |  | $ | (154) |  |  | $ | 119,391 |  |  | $ | (271) |
U.S. Treasuries | — |  |  | — |  |  | 5,005 |  |  | (2) |  |  | 5,005 |  |  | (2) |
U.S. Government Agencies | 10,974 |  |  | (20) |  |  | — |  |  | — |  |  | 10,974 |  |  | (20) |
| $ | 81,707 |  |  | $ | (137) |  |  | $ | 53,663 |  |  | $ | (156) |  |  | $ | 135,370 |  |  | $ | (293) |
| 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) |

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