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Note 10. Severance Expense (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 23, 2012
Sep. 30, 2013
Sep. 23, 2012
Restructuring and Related Activities [Abstract]        
Severance Costs $ 100 $ 3,400 $ 100 $ 3,500
Restructuring and Related Cost, Number of Positions Eliminated       75