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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Marketable Securities |
Schedule of marketable securities |
|  | 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
|  | December 31, 2016
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  |
|  | Cost |  | Gains |  | Losses |  | Fair Value
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Money Market Funds |  | $ | 12,137 |  | $ | — |  | $ | — |  | $ | 12,137
Corporate Securities |  |  | 182,394 |  |  | 6 |  |  | (917) |  |  | 181,483
Government Securities |  |  | 207,986 |  |  | 44 |  |  | (565) |  |  | 207,465
|  | $ | 402,517 |  | $ | 50 |  | $ | (1,482) |  | $ | 401,085
Reported as |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | $ | 12,137
Marketable securities |  |  |  |  |  |  |  |  |  |  |  | 388,948
Total investments |  |  |  |  |  |  |  |  |  |  | $ | 401,085
Schedule of maturities of marketable securities |
|  | Amortized |  | Estimated
|  | Cost |  | Fair Value
(in thousands) |  |  |  |  |  |
Mature in one year or less |  | $ | 208,200 |  | $ | 207,603
Mature after one year through five years |  |  | 140,399 |  |  | 139,197
|  | $ | 348,599 |  | $ | 346,800
Schedule of unrealized losses on available-for-sale investments |
|  | 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)
|  | December 31, 2016
|  | Less than 12 months |  | 12 months or greater
|  |  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Corporate Securities |  | $ | 82,215 |  | $ | (133) |  | $ | 88,990 |  | $ | (784)
Government Securities |  |  | 17,573 |  |  | (16) |  |  | 149,694 |  |  | (549)
|  | $ | 99,788 |  | $ | (149) |  | $ | 238,684 |  | $ | (1,333)

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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 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://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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