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Marketable Securities - Continuous Unrealized Loss Position (Details) $ in Thousands | Mar. 31, 2018 USD ($)
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Investments in an Unrealized Loss Position |  |
Fair Value | $ 1,499,818 |
Gross Unrealized Losses, less than 12 months | (15,514) | [1]
Gross Unrealized Losses, 12 months or more | 6,300 |
Corporate debt securities |  |
Investments in an Unrealized Loss Position |  |
Fair Value | 773,988 |
Gross Unrealized Losses, less than 12 months | (8,407) | [1]
U.S. Treasury securities |  |
Investments in an Unrealized Loss Position |  |
Fair Value | 400,675 |
Gross Unrealized Losses, less than 12 months | (3,866) | [1]
U.S. Government agency securities |  |
Investments in an Unrealized Loss Position |  |
Fair Value | 307,473 |
Gross Unrealized Losses, less than 12 months | (3,100) | [1]
Sovereign securities |  |
Investments in an Unrealized Loss Position |  |
Fair Value | 17,682 |
Gross Unrealized Losses, less than 12 months | $ (141) | [1]
[1] | As of March 31, 2018, the amount of total gross unrealized losses related to investments that had been in a continuous loss position for 12 months or more was $6.3 million.

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale 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 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 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 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: 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 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 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + 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)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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