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Marketable Securities - Continuous Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2016 USD ($)
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Investments in an Unrealized Loss Position |  |
Fair Value | $ 1,230,263 |
Gross Unrealized Losses, less than 12 months | (6,235) | [1]
Corporate debt securities |  |
Investments in an Unrealized Loss Position |  |
Fair Value | 702,366 |
Gross Unrealized Losses, less than 12 months | (2,969) | [1]
U.S. Government agency securities |  |
Investments in an Unrealized Loss Position |  |
Fair Value | 310,258 |
Gross Unrealized Losses, less than 12 months | (1,957) | [1]
U.S. Treasury securities |  |
Investments in an Unrealized Loss Position |  |
Fair Value | 173,202 |
Gross Unrealized Losses, less than 12 months | (1,203) | [1]
Sovereign securities |  |
Investments in an Unrealized Loss Position |  |
Fair Value | 43,433 |
Gross Unrealized Losses, less than 12 months | (106) | [1]
Municipal securities |  |
Investments in an Unrealized Loss Position |  |
Fair Value | 1,004 |
Gross Unrealized Losses, less than 12 months | $ 0 | [1]
[1] | As of December 31, 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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