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Marketable Securities (Details) - USD ($) $ in Thousands | Apr. 01, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | $ 2,602,400 | $ 2,434,145
Unrealized Gain | 1,082 | 819
Unrealized Loss | (2,444) | (2,769)
Fair Value | 2,601,038 | 2,432,195
Debt securities due in one year or less | 1,456,067 | 1,388,537
Debt securities due after one year through three years | 839,362 | 843,605
Total debt securities | 2,295,429 | 2,232,142
Cash Equivalents [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | 219,022 | 124,793
Unrealized Gain |  | 1
Unrealized Loss | (3) |
Fair Value | 219,019 | 124,794
Investments [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | 2,383,378 | 2,309,352
Unrealized Gain | 1,082 | 818
Unrealized Loss | (2,441) | (2,769)
Fair Value | 2,382,019 | 2,307,401
US Treasury Securities |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | 522,628 | 570,695
Unrealized Gain | 96 | 253
Unrealized Loss | (712) | (635)
US Treasury Securities | Fair Value Measurements, Recurring |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Fair Value | 522,012 | 570,313
Foreign Government Debt Securities |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | 3,981 | 17,999
Unrealized Loss |  | (8)
Foreign Government Debt Securities | Fair Value Measurements, Recurring |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Fair Value | 3,981 | 17,991
Corporate Debt Securities |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | 1,770,252 | 1,645,468
Unrealized Gain | 916 | 496
Unrealized Loss | (1,732) | (2,126)
Corporate Debt Securities | Fair Value Measurements, Recurring |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Fair Value | 1,769,436 | 1,643,838
Time Deposits |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Amortized Cost | 305,462 | 199,906
Time Deposits | Fair Value Measurements, Recurring |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Fair Value | 305,462 | 199,906
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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