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SHORT-TERM AND LONG-TERM INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Summary of Amortized Costs, Gross Unrealized Gains and Losses and Estimated Fair Values of Available-For-Sale Marketable Securities | 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 |
Scheduled Maturities of Available-for-Sale Marketable Securities | 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 |
Schedule of Unrealized Losses and Fair Values | 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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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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