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Cash and Investments in Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2019
Fair Value Disclosures [Abstract] |
Cash and Investments in Marketable Securities, Including Cash Equivalents | Cash and investments in marketable securities, including cash equivalents, are as follows (in thousands):
| Estimated Fair Value at
| September 30, 2019 |  | December 31, 2018
Cash and cash equivalents | $ | 81,224 |  |  | $ | 194,905 |
Short-term investments | 1,414,448 |  |  | 1,140,445 |
Long-term investments | 231,082 |  |  | 582,889 |
Total cash and investments in marketable securities | $ | 1,726,754 |  |  | $ | 1,918,239 |
Portfolio of Cash and Investments in Marketable Securities | Our portfolio of cash and investments in marketable securities includes (in thousands):
|  |  | Estimated Fair Value at
| Fair Value Hierarchy Level |  | September 30, 2019 |  | December 31, 2018
Corporate notes and bonds | 2 |  | $ | 1,163,575 |  |  | $ | 1,288,986 |
Corporate commercial paper | 2 |  | 482,468 |  |  | 498,048 |
Obligations of U.S. government agencies | 2 |  | — |  |  | 12,977 |
Available-for-sale investments |  |  | 1,646,043 |  |  | 1,800,011 |
Money market funds | 1 |  | 45,674 |  |  | 105,656 |
Certificate of deposit | N/A |  | 6,871 |  |  | 6,760 |
Cash | N/A |  | 28,166 |  |  | 5,812 |
Total cash and investments in marketable securities |  |  | $ | 1,726,754 |  |  | $ | 1,918,239 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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