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MARKETABLE SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Schedule of Marketable Securities with Contractual Maturities | Marketable securities with contractual maturities of up to one year are as follows:
|  | December 31, |
|  | 2017 |  |  | 2016 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |  |  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Government and corporate debentures - fixed interest rate |  | $ | 1,026,555 |  |  | $ | 48 |  |  | $ | (1,698 | ) |  | $ | 1,024,905 |  |  | $ | 915,302 |  |  | $ | 311 |  |  | $ | (446 | ) |  | $ | 915,167 |
Government-sponsored enterprises debentures |  |  | 112,951 |  |  |  | 1 |  |  |  | (275 | ) |  |  | 112,677 |  |  |  | 149,972 |  |  |  | 99 |  |  |  | (61 | ) |  |  | 150,010 |
Government and corporate debentures - floating interest rate |  |  | 27,681 |  |  |  | 14 |  |  |  | (11 | ) |  |  | 27,684 |  |  |  | 13,247 |  |  |  | 16 |  |  |  | — |  |  |  | 13,263 |
|  | $ | 1,167,187 |  |  | $ | 63 |  |  | $ | (1,984 | ) |  | $ | 1,165,266 |  |  | $ | 1,078,521 |  |  | $ | 426 |  |  | $ | (507 | ) |  | $ | 1,078,440 |
Marketable securities with contractual maturities of over one year through five years are as follows:
|  | December 31, |
|  | 2017 |  |  | 2016 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |  |  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Government and corporate debentures - fixed interest rate |  | $ | 1,985,849 |  |  | $ | 384 |  |  | $ | (15,204 | ) |  | $ | 1,971,029 |  |  | $ | 1,770,641 |  |  | $ | 1,903 |  |  | $ | (11,024 | ) |  | $ | 1,761,520 |
Government-sponsored enterprises debentures |  |  | 424,619 |  |  |  | — |  |  |  | (4,687 | ) |  |  | 419,932 |  |  |  | 520,669 |  |  |  | 282 |  |  |  | (4,052 | ) |  |  | 516,899 |
Government and corporate debentures - floating interest rate |  |  | 46,247 |  |  |  | 134 |  |  |  | (27 | ) |  |  | 46,354 |  |  |  | 17,610 |  |  |  | 70 |  |  |  | (2 | ) |  |  | 17,678 |
|  | $ | 2,456,715 |  |  | $ | 518 |  |  | $ | (19,918 | ) |  | $ | 2,437,315 |  |  | $ | 2,308,920 |  |  | $ | 2,255 |  |  | $ | (15,078 | ) |  | $ | 2,296,097 |
Investments with Continuous Unrealized Losses | Investments with continuous unrealized losses for less than 12 months and 12 months or greater and their related fair values were as follows:
|  | December 31, 2017 |
|  | Less than 12 months |  |  | 12 months or greater |  |  | Total |
|  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |  |  | Fair Value |  |  | Unrealized losses |
Government and corporate debentures - fixed interest rate |  | $ | 1,647,125 |  |  | $ | (7,318 | ) |  | $ | 1,063,690 |  |  | $ | (9,585 | ) |  | $ | 2,710,815 |  |  | $ | (16,903 | )
Government-sponsored enterprises debentures |  |  | 236,403 |  |  |  | (1,281 | ) |  |  | 294,986 |  |  |  | (3,681 | ) |  |  | 531,389 |  |  |  | (4,962 | )
Government and corporate debentures - floating interest rate |  |  | 27,810 |  |  |  | (37 | ) |  |  | — |  |  |  | — |  |  |  | 27,810 |  |  |  | (37 | )
|  | $ | 1,911,338 |  |  | $ | (8,636 | ) |  | $ | 1,358,676 |  |  | $ | (13,266 | ) |  | $ | 3,270,014 |  |  | $ | (21,902 | )
|  | December 31, 2016 |
|  | Less than 12 months |  |  | 12 months or greater |  |  | Total |
|  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |  |  | Fair Value |  |  | Unrealized losses |
Government and corporate debentures - fixed interest rate |  | $ | 1,717,212 |  |  | $ | (11,440 | ) |  | $ | 40,465 |  |  | $ | (30 | ) |  | $ | 1,757,677 |  |  | $ | (11,470 | )
Government-sponsored enterprises debentures |  |  | 464,080 |  |  |  | (4,112 | ) |  |  | 4,999 |  |  |  | (1 | ) |  |  | 469,079 |  |  |  | (4,113 | )
Government and corporate debentures - floating interest rate |  |  | 3,000 |  |  |  | (2 | ) |  |  | — |  |  |  | — |  |  |  | 3,000 |  |  |  | (2 | )
|  | $ | 2,184,292 |  |  | $ | (15,554 | ) |  | $ | 45,464 |  |  | $ | (31 | ) |  | $ | 2,229,756 |  |  | $ | (15,585 | )

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Tabular disclosure of unrealized gains and losses on investments. + References No definition available. + Details
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