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Marketable Securities | 9 Months Ended
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Oct. 01, 2016
Marketable Securities [Abstract] |
Marketable Securities | 2 Marketable Securities The Company's marketable securities within cash equivalents and investments included in the consolidated balance sheets are detailed as follows (in thousands):
|  |  | October 1, 2016
|  |  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  |  | Cost |  | Gain |  | Loss |  | Value
U.S. Treasury securities |  | $ | 555,493 |  | $ | 719 |  | $ | (64) |  | $ | 556,148
Foreign government securities |  |  | 17,999 |  |  | 3 |  |  | - |  |  | 18,002
Corporate debt securities |  |  | 1,572,028 |  |  | 1,353 |  |  | (533) |  |  | 1,572,848
Time deposits |  |  | 221,034 |  |  | - |  |  | - |  |  | 221,034
Equity securities |  |  | 77 |  |  | 70 |  |  | - |  |  | 147
| Total |  | $ | 2,366,631 |  | $ | 2,145 |  | $ | (597) |  | $ | 2,368,179
Amounts included in: |  |  |  |  |  |  |  |  |  |  |  |
| Cash equivalents |  | $ | 85,373 |  | $ | - |  | $ | - |  | $ | 85,373
| Investments |  |  | 2,281,258 |  |  | 2,145 |  |  | (597) |  |  | 2,282,806
| Total |  | $ | 2,366,631 |  | $ | 2,145 |  | $ | (597) |  | $ | 2,368,179
|  |  | December 31, 2015
|  |  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  |  | Cost |  | Gain |  | Loss |  | Value
U.S. Treasury securities |  | $ | 628,358 |  | $ | 16 |  | $ | (1,218) |  | $ | 627,156
Foreign government securities |  |  | 15,216 |  |  | - |  |  | (17) |  |  | 15,199
Corporate debt securities |  |  | 1,325,398 |  |  | 159 |  |  | (1,239) |  |  | 1,324,318
Time deposits |  |  | 74,947 |  |  | - |  |  | - |  |  | 74,947
Equity securities |  |  | 77 |  |  | 70 |  |  | - |  |  | 147
| Total |  | $ | 2,043,996 |  | $ | 245 |  | $ | (2,474) |  | $ | 2,041,767
Amounts included in: |  |  |  |  |  |  |  |  |  |  |  |
| Cash equivalents |  | $ | 130,169 |  | $ | - |  | $ | - |  | $ | 130,169
| Investments |  |  | 1,913,827 |  |  | 245 |  |  | (2,474) |  |  | 1,911,598
| Total |  | $ | 2,043,996 |  | $ | 245 |  | $ | (2,474) |  | $ | 2,041,767
The estimated fair value of marketable debt securities by maturity date is as follows (in thousands):
|  |  | October 1, 2016 |  | December 31, 2015
Due in one year or less |  | $ | 1,284,900 |  | $ | 1,137,825
Due after one year through three years |  |  | 862,098 |  |  | 828,848
| Total |  | $ | 2,146,998 |  | $ | 1,966,673

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