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Fair Value Measures (Tables) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Fair Value Disclosures [Abstract] |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis | Assets and liabilities measured at fair value on a recurring basis as of December 31, 2019 are as follows:
(in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds |  |  | $ | 288,926 |  |  | $ | — |  |  | $ | — |  |  | $ | 288,926 |
U.S. Government treasury bills |  | — |  |  | 34,928 |  |  | — |  |  | 34,928 |
Commercial paper |  | — |  |  | 33,587 |  |  | — |  |  | 33,587 |
Other short-term investments: |  |  |  |  |  |  |  |
Mutual fund shares |  | 1,668 |  |  | — |  |  | — |  |  | 1,668 |
Other current assets: |  |  |  |  |  |  |  |
Derivative financial instruments |  | — |  |  | 14,001 |  |  | — |  |  | 14,001 |
Non-current assets: |  |  |  |  |  |  |  |
Money market funds |  | 1,792 |  |  | — |  |  | — |  |  | 1,792 |
Mutual fund shares |  | 12,172 |  |  | — |  |  | — |  |  | 12,172 |
Derivative financial instruments |  | — |  |  | 4,159 |  |  | — |  |  | 4,159 |
Total assets measured at fair value |  | $ | 304,558 |  |  | $ | 86,675 |  |  | $ | — |  |  | $ | 391,233 |
Liabilities: |  |  |  |  |  |  |  |
Accrued liabilities: |  |  |  |  |  |  |  |
Derivative financial instruments |  | $ | — |  |  | $ | 2,266 |  |  | $ | — |  |  | $ | 2,266 |
Other long-term liabilities |  |  |  |  |  |  |  |
Derivative financial instruments |  | — |  |  | 768 |  |  | — |  |  | 768 |
Total liabilities measured at fair value |  | $ | — |  |  | $ | 3,034 |  |  | $ | — |  |  | $ | 3,034 |
| Assets and liabilities measured at fair value on a recurring basis at December 31, 2018 are as follows:
(in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds |  | $ | 122,237 |  |  | $ | — |  |  | $ | — |  |  | $ | 122,237 |
U.S. Government treasury bills |  | — |  |  | 39,952 |  |  | — |  |  | 39,952 |
Available-for-sale short-term investments:(1) |  |  |  |  |  |  |  |
U.S. Government treasury bills |  | — |  |  | 261,602 |  |  | — |  |  | 261,602 |
Other short-term investments: |  |  |  |  |  |  |  |
Mutual fund shares |  | 1,200 |  |  | — |  |  | — |  |  | 1,200 |
Other current assets: |  |  |  |  |  |  |  |
Derivative financial instruments |  | — |  |  | 13,615 |  |  | — |  |  | 13,615 |
Non-current assets: |  |  |  |  |  |  |  |
Money market funds |  | 869 |  |  |  | — |  |  |  | — |  |  |  | 869 |
Mutual fund shares |  | 8,606 |  |  |  | — |  |  |  | — |  |  |  | 8,606 |
Derivative financial instruments |  | — |  |  |  | 9,922 |  |  |  | — |  |  |  | 9,922 |
Total assets measured at fair value |  | $ | 132,912 |  |  | $ | 325,091 |  |  | $ | — |  |  | $ | 458,003 |
Liabilities: |  |  |  |  |  |  |  |
Accrued liabilities: |  |  |  |  |  |  |  |
Derivative financial instruments |  | $ | — |  |  | $ | 1,017 |  |  | $ | — |  |  | $ | 1,017 |
Other long-term liabilities: |  |  |  |  |  |  |  |
Derivative financial instruments |  | — |  |  | 1 |  |  | — |  |  | 1 |
Total liabilities measured at fair value |  | $ | — |  |  | $ | 1,018 |  |  | $ | — |  |  | $ | 1,018 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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