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Marketable Securities (Details) - USD ($) $ in Thousands | Jul. 02, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | $ 2,221,549 | $ 2,043,996
Unrealized Gain | 3,322 | 245
Unrealized Loss | (381) | (2,474)
Fair Value | 2,224,490 | 2,041,767
Debt securities due in one year or less | 1,251,708 | 1,137,825
Due after one year through three years | 806,483 | 828,848
Total debt securities | 2,058,191 | 1,966,673
Cash Equivalents [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | 88,085 | 130,169
Unrealized Gain | 1 |
Fair Value | 88,086 | 130,169
Investments [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | 2,133,464 | 1,913,827
Unrealized Gain | 3,321 | 245
Unrealized Loss | (381) | (2,474)
Fair Value | 2,136,404 | 1,911,598
US Treasury Securities |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | 584,156 | 628,358
Unrealized Gain | 1,293 | 16
Unrealized Loss | (1) | (1,218)
US Treasury Securities | Fair Value Measurements, Recurring |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Fair Value | 585,448 | 627,156
Foreign Government Debt Securities |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | 17,999 | 15,216
Unrealized Gain | 25 |
Unrealized Loss |  | (17)
Foreign Government Debt Securities | Fair Value Measurements, Recurring |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Fair Value | 18,024 | 15,199
Corporate Debt Securities |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | 1,453,165 | 1,325,398
Unrealized Gain | 1,934 | 159
Unrealized Loss | (380) | (1,239)
Corporate Debt Securities | Fair Value Measurements, Recurring |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Fair Value | 1,454,719 | 1,324,318
Time Deposits |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | 166,152 | 74,947
Time Deposits | Fair Value Measurements, Recurring |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Fair Value | 166,152 | 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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