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SHORT-TERM AND LONG-TERM INVESTMENTS (Summary of Continuous Unrealized Losses and Fair Values) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Held-to-maturity Securities [Line Items] |  |
Fair value, less than 12 months | $ 136,249 | $ 19,444
Fair value,12 months or greater | 55,913 | 63,611
Fair value, Total | 192,162 | 83,055
Unrealized losses, less than 12 months | (711) | (137)
Unrealized losses, 12 months or greater | (368) | (284)
Unrealized losses, Total | (1,079) | (421)
Corporate debentures [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair value, less than 12 months | 135,252 | 19,444
Fair value,12 months or greater | 49,076 | 56,799
Fair value, Total | 184,328 | 76,243
Unrealized losses, less than 12 months | (711) | (137)
Unrealized losses, 12 months or greater | (198) | (88)
Unrealized losses, Total | (909) | (225)
U.S. treasuries [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair value, less than 12 months |  |
Fair value,12 months or greater | 6,837 | 6,812
Fair value, Total | 6,837 | 6,812
Unrealized losses, less than 12 months |  |
Unrealized losses, 12 months or greater | (170) | (196)
Unrealized losses, Total | (170) | $ (196)
U.S. Government agencies [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair value, less than 12 months | 997 |
Fair value,12 months or greater |  |
Fair value, Total | 997 |
Unrealized losses, less than 12 months |  |
Unrealized losses, 12 months or greater |  |
Unrealized losses, Total |  |

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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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