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Marketable Securities (Tables) | 9 Months Ended
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Sep. 29, 2018
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-Sale Securities Reconciliation | The Company’s marketable securities within cash equivalents and investments included in the consolidated balance sheets are detailed as follows (in thousands):
|  | September 29, 2018 |
|  | Amortized Cost |  |  | Unrealized Gain |  |  | Unrealized Loss |  |  | Fair Value |
U.S. Treasury securities |  | $ | 272,812 |  |  | $ | — |  |  | $ | (894 | ) |  | $ | 271,918 |
Foreign government securities |  |  | 2,994 |  |  |  | — |  |  |  | (36 | ) |  |  | 2,958 |
Corporate debt securities |  |  | 1,066,088 |  |  |  | 424 |  |  |  | (3,130 | ) |  |  | 1,063,382 |
Time deposits |  |  | 179,271 |  |  |  | — |  |  |  | — |  |  |  | 179,271 |
Total |  | $ | 1,521,165 |  |  | $ | 424 |  |  | $ | (4,060 | ) |  | $ | 1,517,529 |
Amounts included in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 122,645 |  |  | $ | — |  |  | $ | (3 | ) |  | $ | 122,642 |
Investments |  |  | 1,398,520 |  |  |  | 424 |  |  |  | (4,057 | ) |  |  | 1,394,887 |
Total |  | $ | 1,521,165 |  |  | $ | 424 |  |  | $ | (4,060 | ) |  | $ | 1,517,529 |
|  | December 31, 2017 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gain |  |  | Loss |  |  | Value |
U.S. Treasury securities |  | $ | 593,599 |  |  | $ | 82 |  |  | $ | (1,693 | ) |  | $ | 591,988 |
Foreign government securities |  |  | 6,982 |  |  |  | — |  |  |  | (30 | ) |  |  | 6,952 |
Corporate debt securities |  |  | 1,977,329 |  |  |  | 897 |  |  |  | (3,066 | ) |  |  | 1,975,160 |
Time deposits |  |  | 371,515 |  |  |  | — |  |  |  | (4 | ) |  |  | 371,511 |
Equity securities |  |  | 77 |  |  |  | 70 |  |  |  | — |  |  |  | 147 |
Total |  | $ | 2,949,502 |  |  | $ | 1,049 |  |  | $ | (4,793 | ) |  | $ | 2,945,758 |
Amounts included in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 194,377 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 194,376 |
Investments |  |  | 2,755,125 |  |  |  | 1,049 |  |  |  | (4,792 | ) |  |  | 2,751,382 |
Total |  | $ | 2,949,502 |  |  | $ | 1,049 |  |  | $ | (4,793 | ) |  | $ | 2,945,758 |
Investments Classified By Contractual Maturity Date | The estimated fair value of marketable debt securities by maturity date is as follows (in thousands):
|  | September 29, 2018 |  |  | December 31, 2017 |
Due in one year or less |  | $ | 1,043,082 |  |  | $ | 1,722,553 |
Due after one year through three years |  |  | 295,176 |  |  |  | 851,547 |
Total |  | $ | 1,338,258 |  |  | $ | 2,574,100 |

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