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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2012
Fair Value Measurements [Abstract]  
Financial Assets And Liabilities Carried At Fair Value
Assets Measured Fair Value On Recurring Basis
                 
     Three Months Ended  
     March 31, 2012      April 2, 2011  

Balance at beginning of the year

   $ 2,588       $ 5,597   

Transfers to Level 3

     0         0   

Total losses (realized or unrealized):

                 

Included in earnings

     0         0   

Included in other comprehensive income (loss)

     0         0   

Purchases and settlements (net)

     0         0   
    

 

 

    

 

 

 

Balance at end of period

   $ 2,588       $ 5,597   
    

 

 

    

 

 

 

Total gains and (losses) for the period included in earnings attributable to the change in unrealized losses relating to assets still held at end of period

   $ 0       $ 0   
    

 

 

    

 

 

 
Summary Of Short-Term And Long-Term Investments
                                 
    As of March 31, 2012  
     Amortized
Cost
     Gross
Unrealized
Gains
     Gross
Unrealized
Losses
    Estimated
Fair Value
 

U.S. government and agency securities

   $ 56,766       $ 84       $ (21   $ 56,829   

Obligations of government-sponsored enterprises

     14,918         26         0        14,944   

State and municipal bonds

     140,820         306         (41     141,085   

Corporate securities

     107,692         507         (792     107,407   

Other investments

     36         0         0        36   
    

 

 

    

 

 

    

 

 

   

 

 

 

Total investments

   $ 320,232       $ 923       $ (854   $ 320,301   
    

 

 

    

 

 

    

 

 

   

 

 

 

 

                                 
     As of December 31, 2011  
     Amortized
Cost
     Gross
Unrealized
Gains
     Gross
Unrealized
Losses
    Estimated
Fair Value
 

U.S. government and agency securities

   $ 50,738       $ 115       $ (6   $ 50,847   

Obligations of government-sponsored enterprises

     16,581         32         (1     16,612   

State and municipal bonds

     142,586         330         (43     142,873   

Corporate securities

     81,132         164         (1,387     79,909   

Other investments

     36         0         0        36   
    

 

 

    

 

 

    

 

 

   

 

 

 

Total investments

   $ 291,073       $ 641       $ (1,437   $ 290,277   
    

 

 

    

 

 

    

 

 

   

 

 

 
Maturity Dates Of Investments
                 
     As of March 31, 2012  
     Amortized Cost      Estimated Fair Value  

Less than 1 year

   $ 175,240       $ 175,169   

1 to 5 years

     144,992         145,132   

6 to 10 years

     0         0   

Thereafter

     0         0   
    

 

 

    

 

 

 

Total

   $ 320,232       $ 320,301