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Marketable Securities (Details) - USD ($) $ in Thousands | Apr. 02, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | $ 2,174,339 | $ 2,043,996
Unrealized Gain | 1,752 | 245
Unrealized Loss | (692) | (2,474)
Fair Value | 2,175,399 | 2,041,767
Debt securities due in one year or less | 1,214,006 | 1,137,825
Due after one year through three years | 854,838 | 828,848
Total debt securities | 2,068,844 | 1,966,673
Cash Equivalents [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | 86,618 | 130,169
Fair Value | 86,618 | 130,169
Investments [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | 2,087,721 | 1,913,827
Unrealized Gain | 1,752 | 245
Unrealized Loss | (692) | (2,474)
Fair Value | 2,088,781 | 1,911,598
US Treasury Securities |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | 607,957 | 628,358
Unrealized Gain | 621 | 16
Unrealized Loss | (41) | (1,218)
US Treasury Securities | Fair Value Measurements, Recurring |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Fair Value | 608,537 | 627,156
Foreign Government Debt Securities |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | 27,008 | 15,216
Unrealized Gain | 6 |
Unrealized Loss | (3) | (17)
Foreign Government Debt Securities | Fair Value Measurements, Recurring |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Fair Value | 27,011 | 15,199
Corporate Debt Securities |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | 1,432,889 | 1,325,398
Unrealized Gain | 1,055 | 159
Unrealized Loss | (648) | (1,239)
Corporate Debt Securities | Fair Value Measurements, Recurring |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Fair Value | 1,433,296 | 1,324,318
Time Deposits |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | 106,408 | 74,947
Time Deposits | Fair Value Measurements, Recurring |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Fair Value | 106,408 | 74,947
Equity Securities |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | 77 | 77
Unrealized Gain | 70 | 70
Equity Securities | Fair Value Measurements, Recurring |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Fair Value | $ 147 | $ 147

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