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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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