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Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 29, 2014
Dec. 31, 2013
Cash, Cash Equivalents and Short-Term Investments [Line Items]    
Amortized Cost $ 1,493,508 $ 1,399,712
Unrealized Gain 559 371
Unrealized Loss (289) (243)
Cash Equivalents and Short-Term Investments, Fair Value 1,493,778 1,399,840
Debt securities due in one year or less 964,559 1,011,459
Debt securities due after one year through two years 458,227 314,184
Total debt securities 1,422,786 1,325,643
Cash Equivalents [Member]
    
Cash, Cash Equivalents and Short-Term Investments [Line Items]    
Amortized Cost 35,965 36,966
Cash Equivalents and Short-Term Investments, Fair Value 35,965 36,966
Investments [Member]
    
Cash, Cash Equivalents and Short-Term Investments [Line Items]    
Amortized Cost 1,457,543 1,362,746
Unrealized Gain 559 371
Unrealized Loss (289) (243)
Cash Equivalents and Short-Term Investments, Fair Value 1,457,813 1,362,874
US Treasury Securities [Member]
    
Cash, Cash Equivalents and Short-Term Investments [Line Items]    
Amortized Cost 629,857 556,438
Unrealized Gain 184 111
Unrealized Loss (60) (10)
Cash Equivalents and Short-Term Investments, Fair Value 629,981 556,539
Foreign Government Debt Securities [Member]
    
Cash, Cash Equivalents and Short-Term Investments [Line Items]    
Amortized Cost 34,990 139,670
Cash Equivalents and Short-Term Investments, Fair Value 34,990 139,670
Corporate Debt Securities [Member]
    
Cash, Cash Equivalents and Short-Term Investments [Line Items]    
Amortized Cost 757,739 629,477
Unrealized Gain 305 190
Unrealized Loss (229) (233)
Cash Equivalents and Short-Term Investments, Fair Value 757,815 629,434
Time Deposits [Member]
    
Cash, Cash Equivalents and Short-Term Investments [Line Items]    
Amortized Cost 70,845 74,050
Cash Equivalents and Short-Term Investments, Fair Value 70,845 74,050
Equity Securities [Member]
    
Cash, Cash Equivalents and Short-Term Investments [Line Items]    
Amortized Cost 77 77
Unrealized Gain 70 70
Cash Equivalents and Short-Term Investments, Fair Value $ 147 $ 147