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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2018
Marketable Securities |
Schedule of marketable securities |
|  | December 31, 2018
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  |
|  | Cost |  | Gains |  | Losses |  | Fair Value
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Money Market Funds |  | $ | 18,270 |  | $ | — |  | $ | — |  | $ | 18,270
Corporate Securities |  |  | 105,311 |  |  | 1 |  |  | (345) |  |  | 104,967
Government Securities |  |  | 399,873 |  |  | 187 |  |  | (804) |  |  | 399,256
|  | $ | 523,454 |  | $ | 188 |  | $ | (1,149) |  | $ | 522,493
Reported as |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | $ | 18,270
Marketable securities |  |  |  |  |  |  |  |  |  |  |  | 504,223
Total investments |  |  |  |  |  |  |  |  |  |  | $ | 522,493
|  | December 31, 2017
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  |
|  | 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
|  | Cost |  | Fair Value
(in thousands) |  |  |  |  |  |
Mature in one year or less |  | $ | 269,092 |  | $ | 268,115
Mature after one year through five years |  |  | 236,092 |  |  | 236,108
|  | $ | 505,184 |  | $ | 504,223
Schedule of unrealized losses on available-for-sale investments |
|  | December 31, 2018
|  | Less than 12 months |  | 12 months or greater
|  |  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized gain (losses)
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Corporate Securities |  | $ | 84,770 |  | $ | (310) |  | $ | 20,198 |  | $ | (34)
Government Securities |  |  | 183,345 |  |  | (667) |  |  | 215,910 |  |  | 50
|  | $ | 268,115 |  | $ | (977) |  | $ | 236,108 |  | $ | 16
|  | December 31, 2017
|  | Less than 12 months |  | 12 months or greater
|  |  | 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 Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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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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