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MARKETABLE SECURITIES (Schedule of Marketable Securities Calssified as Available-for-sale Securities) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Fair value | $ 164,301 | $ 22,992
Less Than A Year [Member] |  |
Amortized cost | 163,988 | 23,028
Gross unrealized gains | 330 | 3
Gross unrealized losses | (17) | (39)
Fair value | 164,301 | 22,992
Government and corporate debentures - fixed interest rate Less Than A Year [Member] |  |
Amortized cost | 148,437 | 22,028
Gross unrealized gains | 329 | 3
Gross unrealized losses | (15) | (39)
Fair value | 148,751 | 21,992
Government Sponsored Enterprises Less Than A Year [Member] |  |
Amortized cost | 12,548 |
Gross unrealized gains |  |
Gross unrealized losses | (1) |
Fair value | 12,547 |
Government and corporate debentures - floating interest rate Less Than A Year[Member] |  |
Amortized cost | 3,003 | 1,000
Gross unrealized gains | 1 |
Gross unrealized losses | (1) |
Fair value | 3,003 | 1,000
More Than A Year [Member] |  |
Amortized cost | 176,760 | 47,504
Gross unrealized gains | 612 | 4
Gross unrealized losses | (74) | (283)
Fair value | 177,298 | 47,225
Government and corporate debentures - fixed interest rate More Than A Year [Member] |  |
Amortized cost | 135,040 | 47,504
Gross unrealized gains | 595 | 4
Gross unrealized losses | (65) | (283)
Fair value | 135,570 | 47,225
Government-sponsored enterprises More Than A Year [Member] |  |
Amortized cost | 17,579 |
Gross unrealized gains | 9 |
Gross unrealized losses | (3) |
Fair value | 17,585 |
Government and corporate debentures - floating interest rate More Than A Year[Member] |  |
Amortized cost | 24,141 |
Gross unrealized gains | 8 |
Gross unrealized losses | (6) |
Fair value | $ 24,143 |

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + 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=118939692&loc=d3e27161-111563 + Details
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