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Financial Instruments (Tables)
9 Months Ended
Oct. 02, 2011
Financial Instruments [Abstract] 
Carrying value and estimated fair value of financial instruments
                                 
          Fair Value Measurements at October 2, 2011  
    Total Carrying
Value at
October 2, 2011		     Quoted Prices in
Active Markets
(Level 1)		     Significant Other
Observable  Inputs
(Level 2)		     Significant
Unobservable
Inputs (Level 3)		  

Assets:

                                

Interest rate swap derivative assets

   $ 8,337     $ —       $ 8,337     $ —    

Restricted investments

     40,952       7,454       33,498       —    

Fixed income securities

     1,915       —         1,915       —    

 

                                 
          Fair Value Measurements at January 2, 2011  
    Total Carrying
Value at
January 2, 2011		     Quoted Prices in
Active Markets
(Level 1)		     Significant Other
Observable  Inputs
(Level 2)		     Significant
Unobservable
Inputs (Level 3)		  

Assets:

                                

Interest rate swap derivative assets

   $ 5,131     $ —       $ 5,131     $ —    

Restricted investments

     11,910       6,168       5,742       —    

Fixed income securities

     1,791       —         1,791       —