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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2018
Marketable Securities |
Schedule of marketable securities |
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  |
September 30, 2018 |  | Cost |  | Gains |  | Losses |  | Fair Value
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Money Market Funds |  | $ | 15,632 |  | $ | — |  | $ | — |  | $ | 15,632
Corporate Securities |  |  | 98,498 |  |  | 1 |  |  | (471) |  |  | 98,028
Government Securities |  |  | 416,664 |  |  | — |  |  | (1,859) |  |  | 414,805
|  | $ | 530,794 |  | $ | 1 |  | $ | (2,330) |  | $ | 528,465
Reported as |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | $ | 15,632
Marketable securities |  |  |  |  |  |  |  |  |  |  |  | 512,833
Total investments |  |  |  |  |  |  |  |  |  |  | $ | 528,465
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  |
December 31, 2017 |  | Cost |  | Gains |  | Losses |  | Fair Value
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Money Market Funds |  | $ | 5,175 |  | $ | — |  | $ | — |  | $ | 5,175
Corporate Securities |  |  | 123,860 |  |  | — |  |  | (590) |  |  | 123,270
Government Securities |  |  | 224,739 |  |  | — |  |  | (1,209) |  |  | 223,530
|  | $ | 353,774 |  | $ | — |  | $ | (1,799) |  | $ | 351,975
Reported as |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | $ | 5,175
Marketable securities |  |  |  |  |  |  |  |  |  |  |  | 346,800
Total investments |  |  |  |  |  |  |  |  |  |  | $ | 351,975
Schedule of maturities of marketable securities |
|  | Amortized |  | Estimated
September 30, 2018 |  | Cost |  | Fair Value
(in thousands) |  |  |  |  |  |
Mature in one year or less |  | $ | 237,736 |  | $ | 236,605
Mature within two years |  |  | 277,426 |  |  | 276,228
|  | $ | 515,162 |  | $ | 512,833
Schedule of unrealized losses on available-for-sale investments | The unrealized losses on available-for-sale investments and their related fair values as of September 30, 2018 and December 31, 2017 are as follows:
|  | Less than 12 months |  | 12 months or greater
September 30, 2018 |  |  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Corporate Securities |  | $ | 69,494 |  | $ | (411) |  | $ | 28,534 |  | $ | (60)
Government Securities |  |  | 167,111 |  |  | (720) |  |  | 247,694 |  |  | (1,139)
|  | $ | 236,605 |  | $ | (1,131) |  | $ | 276,228 |  | $ | (1,199)
|  | Less than 12 months |  | 12 months or greater
December 31, 2017 |  |  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Corporate Securities |  | $ | 79,290 |  | $ | (137) |  | $ | 43,980 |  | $ | (453)
Government Securities |  |  | 128,313 |  |  | (461) |  |  | 95,217 |  |  | (748)
|  | $ | 207,603 |  | $ | (598) |  | $ | 139,197 |  | $ | (1,201)

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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