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Marketable Securities (Details) - USD ($) $ in Thousands	Oct. 01, 2016	Dec. 31, 2015
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	$ 2,366,631	$ 2,043,996
Unrealized Gain	2,145	245
Unrealized Loss	(597)	(2,474)
Fair Value	2,368,179	2,041,767
Debt securities due in one year or less	1,284,900	1,137,825
Due after one year through three years	862,098	828,848
Total debt securities	2,146,998	1,966,673
Cash Equivalents [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	85,373	130,169
Fair Value	85,373	130,169
Investments [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	2,281,258	1,913,827
Unrealized Gain	2,145	245
Unrealized Loss	(597)	(2,474)
Fair Value	2,282,806	1,911,598
US Treasury Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	555,493	628,358
Unrealized Gain	719	16
Unrealized Loss	(64)	(1,218)
US Treasury Securities | Fair Value Measurements, Recurring
Schedule of Available-for-Sale Securities [Line Items]
Fair Value	556,148	627,156
Foreign Government Debt Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	17,999	15,216
Unrealized Gain	3
Unrealized Loss		(17)
Foreign Government Debt Securities | Fair Value Measurements, Recurring
Schedule of Available-for-Sale Securities [Line Items]
Fair Value	18,002	15,199
Corporate Debt Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	1,572,028	1,325,398
Unrealized Gain	1,353	159
Unrealized Loss	(533)	(1,239)
Corporate Debt Securities | Fair Value Measurements, Recurring
Schedule of Available-for-Sale Securities [Line Items]
Fair Value	1,572,848	1,324,318
Time Deposits
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	221,034	74,947
Time Deposits | Fair Value Measurements, Recurring
Schedule of Available-for-Sale Securities [Line Items]
Fair Value	221,034	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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