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Investments and Fair Value Measurements-Fixed Income Maturities (Details 7) (Fixed Income Securities [Member], USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 30, 2012
Fixed income securities by contractual maturity    
Amortized Cost $ 4,488,350 $ 4,920,082
Fair Value 4,498,967 4,945,325
Due Within One Year [Member]
   
Fixed income securities by contractual maturity    
Amortized Cost, due in one year or less 1,450,513  
Fair Value, due in one year or less 1,455,297  
Due Within Two to Five Years [Member]
   
Fixed income securities by contractual maturity    
Amortized Cost, due in years two through five 2,823,465  
Fair Value, due in years two through five 2,829,301  
Due Within Six To Ten Years [Member]
   
Fixed income securities by contractual maturity    
Amortized Cost, due in years six through ten 32,293  
Fair Value, due in years six through ten 32,288  
Due Over Ten Years [Member]
   
Fixed income securities by contractual maturity    
Amortized Cost, due after year ten 182,079  
Fair Value, due after year ten $ 182,081