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Investments Available-for-sale Security (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 23, 2012
Sep. 25, 2011
Sep. 23, 2012
Sep. 25, 2011
Available-for-sale security        
Unrealized gain on available-for-sale security $ (2,338) $ 0 $ 1,251 $ 0
Available-for-sale Securities [Member]
       
Available-for-sale security        
Unrealized gain on available-for-sale security     1,251  
Unrealized gain on available-for-sale security, net of tax     732  
Proceeds from sale of available-for-sale security $ 700