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Supplemental Financial Information (Accrued Payroll and Benefits) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Jan. 01, 2013
Supplemental Financial Information [Abstract]    
Accrued payroll and related liabilities $ 2,611 $ 2,537
Accrued bonus 3,383 1,981
Insurance liabilities 1,127 827
Accrued payroll and benefits $ 7,121 $ 5,345