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Marketable Securities (Tables) | 3 Months Ended
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Apr. 01, 2017
Marketable 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):
|  |  | April 1, 2017
|  |  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  |  | Cost |  | Gain |  | Loss |  | Value
U.S. Treasury securities |  | $ | 522,628 |  | $ | 96 |  | $ | (712) |  | $ | 522,012
Foreign government securities |  |  | 3,981 |  |  | - |  |  | - |  |  | 3,981
Corporate debt securities |  |  | 1,770,252 |  |  | 916 |  |  | (1,732) |  |  | 1,769,436
Time deposits |  |  | 305,462 |  |  | - |  |  | - |  |  | 305,462
Equity securities |  |  | 77 |  |  | 70 |  |  | - |  |  | 147
| Total |  | $ | 2,602,400 |  | $ | 1,082 |  | $ | (2,444) |  | $ | 2,601,038
Amounts included in: |  |  |  |  |  |  |  |  |  |  |  |
| Cash equivalents |  | $ | 219,022 |  | $ | - |  | $ | (3) |  | $ | 219,019
| Investments |  |  | 2,383,378 |  |  | 1,082 |  |  | (2,441) |  |  | 2,382,019
| Total |  | $ | 2,602,400 |  | $ | 1,082 |  | $ | (2,444) |  | $ | 2,601,038
|  |  | December 31, 2016
|  |  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  |  | Cost |  | Gain |  | Loss |  | Value
U.S. Treasury securities |  | $ | 570,695 |  | $ | 253 |  | $ | (635) |  | $ | 570,313
Foreign government securities |  |  | 17,999 |  |  | - |  |  | (8) |  |  | 17,991
Corporate debt securities |  |  | 1,645,468 |  |  | 496 |  |  | (2,126) |  |  | 1,643,838
Time deposits |  |  | 199,906 |  |  | - |  |  | - |  |  | 199,906
Equity securities |  |  | 77 |  |  | 70 |  |  | - |  |  | 147
| Total |  | $ | 2,434,145 |  | $ | 819 |  | $ | (2,769) |  | $ | 2,432,195
Amounts included in: |  |  |  |  |  |  |  |  |  |  |  |
| Cash equivalents |  | $ | 124,793 |  | $ | 1 |  | $ | - |  | $ | 124,794
| Investments |  |  | 2,309,352 |  |  | 818 |  |  | (2,769) |  |  | 2,307,401
| Total |  | $ | 2,434,145 |  | $ | 819 |  | $ | (2,769) |  | $ | 2,432,195
Investments Classified By Contractual Maturity Date | The estimated fair value of marketable debt securities by maturity date is as follows (in thousands):
|  |  | April 1, 2017 |  | December 31, 2016
Due in one year or less |  | $ | 1,456,067 |  | $ | 1,388,537
Due after one year through three years |  |  | 839,362 |  |  | 843,605
| Total |  | $ | 2,295,429 |  | $ | 2,232,142

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