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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis | Assets and liabilities of the Company measured at fair value on a recurring basis as of December 31, 2018, are summarized as follows:
|  |  |  |  | Fair Value Measurements at Reporting Date Using |
Description |  | December 31, 2018 |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 180,340 |  |  | $ | 180,340 |  |  | $ | — |  |  | $ | — |
Time deposits and certificates of deposit |  |  | 850 |  |  |  | — |  |  |  | 850 |  |  |  | — |
Commercial paper |  |  | 2,687 |  |  |  | — |  |  |  | 2,687 |  |  |  | — |
U.S. agency obligations |  |  | 3,418 |  |  |  | — |  |  |  | 3,418 |  |  |  | — |
Restricted cash – money market funds |  |  | 110 |  |  |  | 110 |  |  |  | — |  |  |  | — |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  |  | 102 |  |  |  | — |  |  |  | 102 |  |  |  | — |
Bankers’ acceptance drafts |  |  | 989 |  |  |  | — |  |  |  | 989 |  |  |  | — |
Asset-backed securities |  |  | 9,113 |  |  |  | — |  |  |  | 9,113 |  |  |  | — |
Commercial paper |  |  | 19,359 |  |  |  | — |  |  |  | 19,359 |  |  |  | — |
Corporate obligations |  |  | 9,352 |  |  |  | — |  |  |  | 9,352 |  |  |  | — |
U.S. treasury obligations |  |  | 13,298 |  |  |  | — |  |  |  | 13,298 |  |  |  | — |
U.S. agency obligations |  |  | 21,613 |  |  |  | — |  |  |  | 21,613 |  |  |  | — |
Group insurance contracts |  |  | 5,890 |  |  |  | — |  |  |  | 5,890 |  |  |  | — |
Derivatives – currency forward contracts |  |  | 2,485 |  |  |  | — |  |  |  | 2,485 |  |  |  | — |
Funds in investments and other assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Israeli pension assets |  |  | 14,408 |  |  |  | — |  |  |  | 14,408 |  |  |  | — |
Derivatives – interest rate hedge – non-current |  |  | 6,083 |  |  |  | — |  |  |  | 6,083 |  |  |  | — |
Total assets |  | $ | 290,097 |  |  | $ | 180,450 |  |  | $ | 109,647 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives – currency forward contracts |  | $ | 1,168 |  |  | $ | — |  |  | $ | 1,168 |  |  | $ | — |
Reported as follows: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents, including restricted cash(1) |  | $ | 187,405 |  |  | $ | 180,450 |  |  | $ | 6,955 |  |  | $ | — |
Short-term investments |  |  | 73,826 |  |  |  | — |  |  |  | 73,826 |  |  |  | — |
Other current assets |  |  | 2,485 |  |  |  | — |  |  |  | 2,485 |  |  |  | — |
Total current assets |  | $ | 263,716 |  |  | $ | 180,450 |  |  | $ | 83,266 |  |  | $ |  |
Long-term investments(2) |  | $ | 5,890 |  |  | $ | — |  |  | $ | 5,890 |  |  | $ | — |
Other assets |  |  | 20,491 |  |  |  | — |  |  |  | 20,491 |  |  |  | — |
Total long-term assets |  | $ | 26,381 |  |  | $ | — |  |  | $ | 26,381 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current liabilities |  | $ | 1,168 |  |  | $ | — |  |  | $ | 1,168 |  |  | $ | — |
(1) | The cash and cash equivalent amounts presented in the table above does not include cash of $456,940 as of December 31, 2018.
(2) | The long-term investments presented in the table above do not include our minority interest investment in a private company, which is accounted for under the cost method.
Assets and liabilities of the Company measured at fair value on a recurring basis as of December 31, 2017, are summarized as follows:
|  |  |  |  | Fair Value Measurements at Reporting Date Using |
Description |  | December 31, 2017 |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 4,987 |  |  | $ | 4,987 |  |  | $ | — |  |  | $ | — |
Time deposits and certificates of deposit |  |  | 2,100 |  |  |  | — |  |  |  | 2,100 |  |  |  | — |
Commercial paper |  |  | 30,475 |  |  |  | — |  |  |  | 30,475 |  |  |  | — |
Restricted cash – money market funds |  |  | 119 |  |  |  | 119 |  |  |  | — |  |  |  | — |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  |  | 9,757 |  |  |  | — |  |  |  | 9,757 |  |  |  | — |
Bankers’ acceptance drafts |  |  | 5,330 |  |  |  | — |  |  |  | 5,330 |  |  |  | — |
Asset-backed securities |  |  | 36,990 |  |  |  | — |  |  |  | 36,990 |  |  |  | — |
Commercial paper |  |  | 13,750 |  |  |  | — |  |  |  | 13,750 |  |  |  | — |
Corporate obligations |  |  | 77,821 |  |  |  | — |  |  |  | 77,821 |  |  |  | — |
Municipal bonds |  |  | 1,970 |  |  |  | — |  |  |  | 1,970 |  |  |  | — |
U.S. treasury obligations |  |  | 28,078 |  |  |  | — |  |  |  | 28,078 |  |  |  | — |
U.S. agency obligations |  |  | 35,738 |  |  |  | — |  |  |  | 35,738 |  |  |  | — |
Group insurance contracts |  |  | 6,255 |  |  |  | — |  |  |  | 6,255 |  |  |  | — |
Derivatives – currency forward contracts |  |  | 168 |  |  |  | — |  |  |  | 168 |  |  |  | — |
Funds in investments and other assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |
Israeli pension assets |  |  | 15,048 |  |  |  | — |  |  |  | 15,048 |  |  |  | — |
Derivatives – interest rate hedge – non-current |  |  | 6,179 |  |  |  | — |  |  |  | 6,179 |  |  |  | — |
Total assets |  | $ | 274,765 |  |  | $ | 5,106 |  |  | $ | 269,659 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives – currency forward contracts |  | $ | 6,198 |  |  | $ | — |  |  | $ | 6,198 |  |  | $ | — |
Reported as follows: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents, including restricted cash(1) |  | $ | 37,681 |  |  | $ | 5,106 |  |  | $ | 32,575 |  |  | $ | — |
Short-term investments |  |  | 209,434 |  |  |  | — |  |  |  | 209,434 |  |  |  | — |
Other current assets |  |  | 168 |  |  |  | — |  |  |  | 168 |  |  |  | — |
Total current assets |  | $ | 247,283 |  |  | $ | 5,106 |  |  | $ | 242,177 |  |  | $ | — |
Long-term investments(2) |  | $ | 6,255 |  |  | $ | — |  |  | $ | 6,255 |  |  | $ | — |
Other assets |  |  | 21,227 |  |  |  | — |  |  |  | 21,227 |  |  |  | — |
Total long-term assets |  | $ | 27,482 |  |  | $ | — |  |  | $ | 27,482 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current liabilities |  | $ | 6,198 |  |  | $ | — |  |  | $ | 6,198 |  |  | $ | — |
(1) | The cash and cash equivalent amounts presented in the table above do not include cash of $292,808 and non-negotiable time deposits of $3,398 as of December 31, 2017.
(2) | The long-term investments presented in the table above do not include our minority interest investment in a private company, which is accounted for under the cost method.

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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://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 + Details
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