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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Cash, Cash Equivalents And Marketable Securities [Abstract] |
Cash, Cash Equivalents, And Marketable Securities | The following table summarizes the Company’s cash, cash equivalents, and marketable securities and the fair value categorization of the financial instruments measured at fair value on a recurring basis:
| As of December 31,
| 2017 |  | 2016
| (In thousands)
Cash | $ | 135,092 |  |  | $ | 39,183 |
Time deposits | 3,682 |  |  | 4,632 |
Money market funds (Level 1) | 116,068 |  |  | 134,790 |
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies (Level 1) | 2,169,172 |  |  | 1,626,764 |
Equity securities of public companies (Level 1) | 25 |  |  | 2,174 |
Total | $ | 2,424,039 |  |  | $ | 1,807,543 |
Included in Cash and cash equivalents | $ | 465,851 |  |  | $ | 231,945 |
Included in Marketable securities | 1,948,900 |  |  | 1,565,962 |
Included in Other assets (Restricted cash) | 9,288 |  |  | 9,636 |
Total | $ | 2,424,039 |  |  | $ | 1,807,543 |

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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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- Definition Cash, Cash Equivalents, And Marketable Securities [Abstract] + References No definition available. + Details
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