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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 29, 2012
Dec. 31, 2011
Cash in escrow:    
Restricted cash $ 36,245 $ 20,576
Mortgage
    
Cash in escrow:    
Restricted cash 25,557 [1],[2] 10,011 [1],[2]
Insurance
    
Cash in escrow:    
Restricted cash 7,903 8,786
Other
    
Cash in escrow:    
Restricted cash $ 2,785 [1] $ 1,779 [1]
[1] Included in the "Other" restricted cash category is approximately $0.8 million of cash held in escrow related to the sale of the Fremont, California location.
[2] The increase in cash in escrow related to the mortgage is primarily comprised of restricted cash from the sale of the Newark, California location discussed in "Note 7. - Mortgage".