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Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Jun. 29, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash, Cash Equivalents and Short-Term Investments [Line Items]        
Amortized Cost   $ 1,399,712 $ 1,160,955  
Unrealized Gain   371    
Unrealized Loss   (243) (1,583)  
Fair Value   1,399,840 1,159,372  
Debt securities due in one year or less   1,011,459 1,057,990  
Debt securities due after one year through two years   314,184    
Debt securities   1,325,643 1,057,990  
Loss on investments (1,575) (1,575)    
Realized investment gains losses, description   Realized gains and losses on sales of investments were not material in 2013, 2012 and 2011. Realized gains and losses on sales of investments were not material in 2013, 2012 and 2011. Realized gains and losses on sales of investments were not material in 2013, 2012 and 2011.
Cash Equivalents [Member]
       
Cash, Cash Equivalents and Short-Term Investments [Line Items]        
Amortized Cost   36,966 101,382  
Fair Value   36,966 101,382  
Investments [Member]
       
Cash, Cash Equivalents and Short-Term Investments [Line Items]        
Amortized Cost   1,362,746 1,059,573  
Unrealized Gain   371    
Unrealized Loss   (243) (1,583)  
Fair Value   1,362,874 1,057,990  
US Treasury Securities
       
Cash, Cash Equivalents and Short-Term Investments [Line Items]        
Amortized Cost   556,438 470,421  
Unrealized Gain   111    
Unrealized Loss   (10)    
Fair Value   556,539 470,421  
Foreign Government Debt Securities
       
Cash, Cash Equivalents and Short-Term Investments [Line Items]        
Amortized Cost   139,670 313,237  
Fair Value   139,670 313,237  
Corporate Debt Securities
       
Cash, Cash Equivalents and Short-Term Investments [Line Items]        
Amortized Cost   629,477 311,607  
Unrealized Gain   190    
Unrealized Loss   (233)    
Fair Value   629,434 311,607  
Time Deposits
       
Cash, Cash Equivalents and Short-Term Investments [Line Items]        
Amortized Cost   74,050 64,037  
Fair Value   74,050 64,037  
Equity Securities
       
Cash, Cash Equivalents and Short-Term Investments [Line Items]        
Amortized Cost   77 1,653  
Unrealized Gain   70    
Unrealized Loss     (1,583)  
Fair Value   $ 147 $ 70