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v3.19.1

Marketable Securities | 3 Months Ended
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Mar. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | 3 Marketable Securities The Company’s marketable securities within cash equivalents and investments included in the consolidated balance sheets are detailed as follows (in thousands):
|  | March 30, 2019 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gain |  |  | Loss |  |  | Value |
U.S. Treasury securities |  | $ | 98,723 |  |  | $ | 12 |  |  | $ | (159 | ) |  | $ | 98,576 |
Foreign government securities |  |  | 3,489 |  |  |  | 1 |  |  |  | (14 | ) |  |  | 3,476 |
Corporate debt securities |  |  | 368,163 |  |  |  | 121 |  |  |  | (663 | ) |  |  | 367,621 |
Time deposits |  |  | 52,507 |  |  |  | — |  |  |  | — |  |  |  | 52,507 |
Total |  | $ | 522,882 |  |  | $ | 134 |  |  | $ | (836 | ) |  | $ | 522,180 |
Amounts included in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 39,886 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 39,887 |
Investments |  |  | 482,996 |  |  |  | 133 |  |  |  | (836 | ) |  |  | 482,293 |
Total |  | $ | 522,882 |  |  | $ | 134 |  |  | $ | (836 | ) |  | $ | 522,180 |
|  | December 31, 2018 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gain |  |  | Loss |  |  | Value |
U.S. Treasury securities |  | $ | 164,619 |  |  | $ | 16 |  |  | $ | (320 | ) |  | $ | 164,315 |
Foreign government securities |  |  | 3,486 |  |  |  | 1 |  |  |  | (24 | ) |  |  | 3,463 |
Corporate debt securities |  |  | 725,778 |  |  |  | 41 |  |  |  | (2,760 | ) |  |  | 723,059 |
Time deposits |  |  | 108,638 |  |  |  | — |  |  |  | — |  |  |  | 108,638 |
Total |  | $ | 1,002,521 |  |  | $ | 58 |  |  | $ | (3,104 | ) |  | $ | 999,475 |
Amounts included in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 60,532 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 60,531 |
Investments |  |  | 941,989 |  |  |  | 58 |  |  |  | (3,103 | ) |  |  | 938,944 |
Total |  | $ | 1,002,521 |  |  | $ | 58 |  |  | $ | (3,104 | ) |  | $ | 999,475 |
The estimated fair value of marketable debt securities by maturity date is as follows (in thousands):
|  | March 30, 2019 |  |  | December 31, 2018 |
Due in one year or less |  | $ | 437,648 |  |  | $ | 797,649 |
Due after one year through three years |  |  | 84,532 |  |  |  | 201,826 |
Total |  | $ | 522,180 |  |  | $ | 999,475 |

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