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Marketable Securities - Continuous Unrealized Loss Position (Details) $ in Thousands | Sep. 30, 2016 USD ($)
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Investments in an Unrealized Loss Position |  |
Fair Value | $ 559,207 |
Gross Unrealized Losses, less than 12 months | (842) | [1]
Corporate debt securities |  |
Investments in an Unrealized Loss Position |  |
Fair Value | 372,827 |
Gross Unrealized Losses, less than 12 months | (597) | [1]
U.S. Government agency securities |  |
Investments in an Unrealized Loss Position |  |
Fair Value | 126,547 |
Gross Unrealized Losses, less than 12 months | (149) | [1]
U.S. Treasury securities |  |
Investments in an Unrealized Loss Position |  |
Fair Value | 44,791 |
Gross Unrealized Losses, less than 12 months | (92) | [1]
Sovereign securities |  |
Investments in an Unrealized Loss Position |  |
Fair Value | 13,036 |
Gross Unrealized Losses, less than 12 months | (4) | [1]
Municipal securities |  |
Investments in an Unrealized Loss Position |  |
Fair Value | 2,006 |
Gross Unrealized Losses, less than 12 months | $ 0 | [1]
[1] | As of September 30, 2016, the amount of total gross unrealized losses related to investments that had been in a continuous loss position for 12 months or more was immaterial.

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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=73527792&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=73527792&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=73527792&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=73527792&loc=d3e27290-111563 + Details
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