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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASURMENTS (Tables) | 12 Months Ended
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Dec. 31, 2018
FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS [Abstract] |
Schedule of Recurring Fair Value Measurements | Recurring Fair Value Measurements Using the Indicated Inputs:
|  | December 31, 2018 |  |  | Quoted prices in active market for identical liability (Level 1) |  |  | Significant other observable inputs (Level 2) |  |  | Significant unobservable inputs (Level 3) |
Cross currency swap - asset, net position |  | $ | 4,951 |  |  | $ | -- |  |  | $ | 4,951 |  |  | $ | -- |
Marketable securities held for sale |  |  | 135,227 |  |  |  | 135,227 |  |  |  | -- |  |  |  | -- |
Foreign exchange forward and cylinders - liability position |  |  | (395 | ) |  |  | -- |  |  |  | (395 | ) |  |  | -- |
|  | $ | 139,783 |  |  | $ | 135,227 |  |  | $ | 4,556 |  |  | $ | -- |
|  | December 31, 2017 |  |  | Quoted prices in active market for identical liability (Level 1) |  |  | Significant other observable inputs (Level 2) |  |  | Significant unobservable inputs (Level 3) |
Cross currency swap - asset, net position |  | $ | 16,455 |  |  | $ | -- |  |  | $ | 16,455 |  |  | $ | -- |
Marketable securities held for sale |  |  | 113,168 |  |  |  | 113,168 |  |  |  | -- |  |  |  | -- |
Foreign exchange forward and cylinders - liability position |  |  | (169 | ) |  |  | -- |  |  |  | (169 | ) |  |  | -- |
Foreign exchange forward and cylinders - asset position |  |  | 24 |  |  |  | -- |  |  |  | 24 |  |  |  | -- |
|  | $ | 129,478 |  |  | $ | 113,168 |  |  | $ | 16,310 |  |  | $ | -- |
Schedule of 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, 2018:
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross Unrealized losses |  |  | Estimated fair value |
Corporate bonds |  | $ | 111,639 |  |  | $ | 29 |  |  | $ | (2,029 | ) |  | $ | 109,639 |
U.S government bonds |  |  | 5,444 |  |  |  | 21 |  |  |  | -- |  |  |  | 5,465 |
Non-U.S government bonds |  |  | 2,456 |  |  |  | -- |  |  |  | (33 | ) |  |  | 2,423 |
Municipal bonds |  |  | 2,248 |  |  |  | -- |  |  |  | (13 | ) |  |  | 2,235 |
Money market fund |  |  | 15,225 |  |  |  | -- |  |  |  | -- |  |  |  | 15,225 |
Certificate of deposits |  |  | 248 |  |  |  | -- |  |  |  | (8 | ) |  |  | 240 |
|  | $ | 137,260 |  |  | $ | 50 |  |  | $ | (2,083 | ) |  | $ | 135,227 |
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, 2017:
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross Unrealized losses |  |  | Estimated fair value |
Corporate bonds |  | $ | 98,998 |  |  | $ | 25 |  |  | $ | (683 | ) |  | $ | 98,340 |
Non-U.S government bonds |  |  | 2,730 |  |  |  | -- |  |  |  | (19 | ) |  |  | 2,711 |
Municipal bonds |  |  | 11,950 |  |  |  | 15 |  |  |  | (96 | ) |  |  | 11,869 |
Certificate of deposits |  |  | 248 |  |  |  | -- |  |  |  | -- |  |  |  | 248 |
|  | $ | 113,926 |  |  | $ | 40 |  |  | $ | (798 | ) |  | $ | 113,168 |
Schedule of Maturities of Marketable Securities | The scheduled maturities of available-for-sale marketable securities as of December 31, 2018 were as follows:
|  | Amortized cost |  |  | Estimated fair value |
Due within one year |  | $ | 16,686 |  |  | $ | 16,661 |
Due after one year through five years |  |  | 120,574 |  |  |  | 118,566 |
|  | $ | 137,260 |  |  | $ | 135,227 |
The scheduled maturities of available-for-sale marketable securities as of December 31, 2017 were as follows:
|  | Amortized cost |  |  | Estimated fair value |
Due within one year |  | $ | 7,688 |  |  | $ | 7,679 |
Due after one year through five years |  |  | 106,238 |  |  |  | 105,489 |
|  | $ | 113,926 |  |  | $ | 113,168 |
Schedule of Investments with Continuous Unrealized Losses | Investments with continuous unrealized losses for less than 12 months and 12 months or more and their related fair values as of December 31, 2018, were as indicated in the following tables:
|  | December 31, 2018 |
|  | Investment 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 |  | $ | 19,716 |  |  | $ | (140 | ) |  | $ | 79,609 |  |  | $ | (1,889 | ) |  | $ | 99,325 |  |  | $ | (2,029 | )
Non-U.S government bonds |  |  | 963 |  |  |  | -- |  |  |  | 1,460 |  |  |  | (33 | ) |  |  | 2,423 |  |  |  | (33 | )
Municipal bonds |  |  | 2,235 |  |  |  | (13 | ) |  |  | -- |  |  |  | -- |  |  |  | 2,235 |  |  |  | (13 | )
Certificate of deposits |  |  | -- |  |  |  | -- |  |  |  | 240 |  |  |  | (8 | ) |  |  | 240 |  |  |  | (8 | )
Total |  | $ | 22,914 |  |  | $ | (153 | ) |  | $ | 81,309 |  |  | $ | (1,930 | ) |  | $ | 104,223 |  |  | $ | (2,083 | )
Investments with continuous unrealized losses for less than 12 months and 12 months or more and their related fair values as of December 31, 2017, were as indicated in the following tables:
|  | December 31, 2017 |
|  | Investment 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 |  | $ | 89,133 |  |  | $ | (683 | ) |  | $ | -- |  |  | $ | -- |  |  | $ | 89,133 |  |  | $ | (683 | )
Non-U.S government bonds |  |  | 2,711 |  |  |  | (19 | ) |  |  | -- |  |  |  | -- |  |  |  | 2,711 |  |  |  | (19 | )
Municipal bonds |  |  | 8,837 |  |  |  | (96 | ) |  |  | -- |  |  |  | -- |  |  |  | 8,837 |  |  |  | (96 | )
Total |  | $ | 100,681 |  |  | $ | (798 | ) |  | $ | -- |  |  | $ | -- |  |  | $ | 100,681 |  |  | $ | (798 | )

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