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SHORT-TERM AND LONG-TERM INVESTMENTS (Summary of Amortized Costs, Gross Unrealized Gains and Losses and Estimated Fair Values of Available-For-Sale Marketable Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | $ 731,025 | $ 490,741
Gross unrealized gains | 4,985 | 206
Gross unrealized losses | (293) | (2,220)
Estimated fair value (Level 2 within the fair value hierarchy) | 735,717 | 488,727
Fair Value, Inputs, Level 2 | Corporate debentures |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 687,886 | 457,944
Gross unrealized gains | 4,865 | 190
Gross unrealized losses | (271) | (1,993)
Estimated fair value (Level 2 within the fair value hierarchy) | 692,480 | 456,141
Fair Value, Inputs, Level 2 | U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 23,182 | 21,943
Gross unrealized gains | 82 | 0
Gross unrealized losses | (2) | (226)
Estimated fair value (Level 2 within the fair value hierarchy) | 23,262 | 21,717
Fair Value, Inputs, Level 2 | U.S. Government Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 19,957 | 10,854
Gross unrealized gains | 38 | 16
Gross unrealized losses | (20) | (1)
Estimated fair value (Level 2 within the fair value hierarchy) | $ 19,975 | $ 10,869

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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