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SHORT-TERM AND LONG-TERM INVESTMENTS | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
SHORT-TERM AND LONG-TERM INVESTMENTS |
NOTE 3:- | SHORT-TERM AND LONG-TERM INVESTMENTS
Short-term and long-term investments include marketable securities in the amount of $196,771 and $129,013 as of December 31, 2017 and 2016, respectively. 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 and 2016:
|  | 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, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Corporate debentures |  | $ | 189,836 |  |  | $ | 122,335 |  |  | $ | 9 |  |  | $ | 91 |  |  | $ | 908 |  |  | $ | 225 |  |  | $ | 188,937 |  |  | $ | 122,201 |
U.S. Treasuries |  |  | 7,007 |  |  |  | 7,008 |  |  |  | - |  |  |  | - |  |  |  | 170 |  |  |  | 196 |  |  |  | 6,837 |  |  |  | 6,812 |
U.S. Government Agencies |  |  | 998 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 1 |  |  |  | - |  |  |  | 997 |  |  |  | - |
|  | $ | 197,841 |  |  | $ | 129,343 |  |  | $ | 9 |  |  | $ | 91 |  |  | $ | 1,079 |  |  | $ | 421 |  |  | $ | 196,771 |  |  | $ | 129,013 |
The scheduled maturities of available-for-sale marketable securities as of December 31, 2017 were as follows:
|  | Amortized |  |  | Estimated |
|  | cost |  |  | fair value |
Due within one year |  | $ | 64,055 |  |  | $ | 63,951 |
Due after one year through five years |  |  | 133,786 |  |  |  | 132,820 |
|  | $ | 197,841 |  |  | $ | 196,771 |
Investments with continuous unrealized losses for less than 12 months and 12 months or greater and their related fair values as of December 31, 2017 and 2016 were as indicated in the following tables:
|  | December 31, 2017 |
|  | 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 |  | $ | 135,252 |  |  | $ | (711 | ) |  | $ | 49,076 |  |  | $ | (198 | ) |  | $ | 184,328 |  |  | $ | (909 | )
U.S. treasuries |  |  | - |  |  |  | - |  |  |  | 6,837 |  |  |  | (170 | ) |  |  | 6,837 |  |  |  | (170 | )
U.S. Government agencies |  |  | 997 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 997 |  |  |  | - |
|  | $ | 136,249 |  |  | $ | (711 | ) |  | $ | 55,913 |  |  | $ | (368 | ) |  | $ | 192,162 |  |  | $ | (1,079 | )
|  | December 31, 2016 |
|  | 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 |  | $ | 19,444 |  |  | $ | (137 | ) |  | $ | 56,799 |  |  | $ | (88 | ) |  | $ | 76,243 |  |  | $ | (225 | )
U.S. treasuries |  |  | - |  |  |  | - |  |  |  | 6,812 |  |  |  | (196 | ) |  |  | 6,812 |  |  |  | (196 | )
|  | $ | 19,444 |  |  | $ | (137 | ) |  | $ | 63,611 |  |  | $ | (284 | ) |  | $ | 83,055 |  |  | $ | (421 | )

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2289146 + Details
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